feat: derive instance state from latest completion event

Review round 2 (Codex gpt-5.6-terra, 2 LOW): 2015-01-06 is a Tuesday,
not a Monday — the anchor is now the computed first Monday of January
(asserted weekday 0); the docstring names the ISO-week rollover
precisely (the Monday on or after January 4th — January 4th in both
walked years, which end ISO week 53) instead of 'January 1st'. Suite:
1005 passed.

custom_components/nestquest/__init__.py

@@ -2,21 +2,35 @@
 from __future__ import annotations
 
 import asyncio
+import datetime
 import inspect
 import sqlite3
 from collections.abc import Callable
 from dataclasses import dataclass
 from pathlib import Path
 from typing import Any
+from zoneinfo import ZoneInfo
 
 from homeassistant.config_entries import ConfigEntry
 from homeassistant.core import HomeAssistant
 from homeassistant.exceptions import ConfigEntryNotReady
+from homeassistant.helpers.event import async_track_time_change
 
-from .const import DOMAIN, LOGGER
+from .const import (
+    CONF_ADMIN_USER_IDS,
+    CONF_DAY_ROLLOVER_TIME,
+    CONF_HORIZON_DAYS,
+    DEFAULT_DAY_ROLLOVER_TIME,
+    DEFAULT_HORIZON_DAYS,
+    DOMAIN,
+    LOGGER,
+    SERVICE_REGENERATE,
+)
 from .db import NestQuestDatabase
+from .materialize import materialize as _materialize_run
 from .migrations import apply_migrations
 from .store import async_get_db_path
+from .admin_allowlist import seed_setup_admin
 
 _LOGGER = LOGGER
 
@@ -223,6 +237,161 @@ class NestQuestRuntimeData:
     options: dict[str, Any]
     database: NestQuestDatabase
     remove_update_listener: Callable[[], Any]
+    remove_time_change_listener: Callable[[], Any]
+
+
+async def _async_owner_user_ids(hass: HomeAssistant) -> list[str]:
+    """Return every Home Assistant owner-account user id.
+
+    The last-resort admin seed: when no persisted allowlist copy and no
+    flow-context user survive to first setup, the HA owner accounts are
+    seeded so the household is never left with zero admins (an empty
+    allowlist fails closed, which would lock the household out of its
+    own integration).  Owner accounts can already do everything in HA,
+    so granting NestQuest admin is not a privilege escalation.
+    """
+    auth = getattr(hass, "auth", None)
+    if auth is None:
+        return []
+    users = await auth.async_get_users()
+    owners = [
+        user.id
+        for user in users
+        if getattr(user, "is_owner", False) and getattr(user, "id", None)
+    ]
+    return owners
+
+
+def _day_rollover_hour_minute(options: dict[str, Any]) -> tuple[int, int]:
+    """Return the (hour, minute) the daily rollover fires at from ``options``.
+
+    The options flow validates ``day_rollover_time`` as a strict ``HH:MM``
+    string, so a stored value never needs re-validation here; a missing key
+    falls back to :data:`~.const.DEFAULT_DAY_ROLLOVER_TIME`.
+    """
+    rollover = options.get(CONF_DAY_ROLLOVER_TIME, DEFAULT_DAY_ROLLOVER_TIME)
+    hour, _, minute = rollover.partition(":")
+    return int(hour), int(minute)
+
+
+def _configured_horizon_days(options: dict[str, Any]) -> int:
+    """Return the configured generation horizon, validated, else the default.
+
+    The options flow already validates ``horizon_days`` as an integer >= 1,
+    but a stored ``entry.options`` dict could still carry a partial or
+    hand-edited value.  Re-checking here — and falling back to
+    :data:`~.const.DEFAULT_HORIZON_DAYS` on a missing, non-int or sub-1 value
+    — keeps a malformed option from shrinking or exploding the materialized
+    horizon.
+    """
+    value = options.get(CONF_HORIZON_DAYS, DEFAULT_HORIZON_DAYS)
+    if isinstance(value, bool) or not isinstance(value, int) or value < 1:
+        return DEFAULT_HORIZON_DAYS
+    return value
+
+
+async def _run_horizon_materialization(
+    hass: HomeAssistant,
+    database: NestQuestDatabase,
+    horizon_days: int = DEFAULT_HORIZON_DAYS,
+) -> None:
+    """Materialize the rolling horizon ``[today, today + horizon_days]``.
+
+    "today" is computed in HA local time (``hass.config.time_zone``) rather
+    than the system clock, so the horizon tracks the household's own day.
+    The walk itself runs through :func:`~.materialize.materialize`, whose DB
+    access is executor-only.
+
+    This is the ONE generation path: the startup backfill, the daily rollover
+    listener and the ``regenerate`` service all funnel through it, so there is
+    no duplicated materialization logic.  ``horizon_days`` sizes the window
+    and defaults to :data:`~.const.DEFAULT_HORIZON_DAYS`; callers thread the
+    entry's validated option value through.
+    """
+    time_zone = ZoneInfo(hass.config.time_zone)
+    today = datetime.datetime.now(time_zone).date()
+    start_date = today.isoformat()
+    end_date = (
+        today + datetime.timedelta(days=horizon_days)
+    ).isoformat()
+    await _materialize_run(database, start_date, end_date, today=today)
+
+
+def _register_day_rollover_listener(
+    hass: HomeAssistant,
+    database: NestQuestDatabase,
+    options: dict[str, Any],
+) -> Callable[[], Any]:
+    """Register the daily materialization listener and return its remover.
+
+    Fires once per day at the configured local ``day_rollover_time`` and
+    materializes the rolling horizon ``[today, today + horizon_days]``
+    through the shared :func:`_run_horizon_materialization` path, using the
+    entry's configured (validated) ``horizon_days``.
+    """
+    hour, minute = _day_rollover_hour_minute(options)
+    horizon_days = _configured_horizon_days(options)
+
+    async def _run_materialization(_now: datetime.datetime) -> None:
+        await _run_horizon_materialization(hass, database, horizon_days)
+
+    return async_track_time_change(
+        hass, _run_materialization, hour=hour, minute=minute
+    )
+
+
+def _find_live_runtime_data(hass: HomeAssistant) -> NestQuestRuntimeData | None:
+    """Return a live runtime record with a connected database, or None.
+
+    The domain-global services (e.g. ``regenerate``) have no database of
+    their own; they resolve whichever config entry's runtime data is
+    currently live at call time, so none of them can hold a stale handle
+    to a closed connection after another entry unloads.  The record also
+    carries that entry's options (e.g. the configured horizon).
+    """
+    for runtime_data in hass.data.get(DOMAIN, {}).values():
+        database = getattr(runtime_data, "database", None)
+        if database is not None and database.connected:
+            return runtime_data
+    return None
+
+
+def _register_regenerate_service(hass: HomeAssistant) -> None:
+    """Register ``nestquest.regenerate`` once at domain scope.
+
+    The service triggers a full on-demand regeneration over the rolling
+    horizon, running the SAME idempotent materialize path
+    (:func:`_run_horizon_materialization`) as the startup backfill and the
+    daily rollover listener.  It is DOMAIN-global — registered exactly once
+    (guarded by ``has_service``) and NOT bound to any config entry — so the
+    handler resolves the currently-live database at call time and a name
+    collision or duplicate setup is impossible.  Removal is handled by the
+    unload path only once the LAST entry is removed (see
+    :func:`_deregister_regenerate_service`).
+    """
+    if hass.services.has_service(DOMAIN, SERVICE_REGENERATE):
+        return
+
+    async def _regenerate(_call: Any) -> None:
+        runtime_data = _find_live_runtime_data(hass)
+        if runtime_data is None:
+            _LOGGER.warning(
+                "NestQuest regenerate requested but no config entry has a "
+                "live database; ignoring"
+            )
+            return
+        horizon_days = _configured_horizon_days(runtime_data.options)
+        await _run_horizon_materialization(
+            hass, runtime_data.database, horizon_days
+        )
+
+    hass.services.async_register(DOMAIN, SERVICE_REGENERATE, _regenerate)
+
+
+def _deregister_regenerate_service(hass: HomeAssistant) -> None:
+    """Remove ``nestquest.regenerate`` when the last entry unloads."""
+    if hass.services.has_service(DOMAIN, SERVICE_REGENERATE):
+        hass.services.async_remove(DOMAIN, SERVICE_REGENERATE)
 
 
 async def async_setup(hass: HomeAssistant, config: dict[str, Any]) -> bool:
@@ -241,10 +410,36 @@ async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
             # record without a live connection (a previous setup's
             # close-on-failure, or a hand-replaced file) must get the
             # missing/valid/corrupt classification too, never a raw
-            # sqlite3 error and never skipped migrations.
+            # sqlite3 error and never skipped migrations — and the
+            # same allowlist seeding, so a reopened fresh file is
+            # never ownerless.
             db = await _async_open_database(
                 hass, await async_get_db_path(hass)
             )
+            try:
+                stored_admin_ids = (
+                    entry.options.get(CONF_ADMIN_USER_IDS)
+                    or entry.data.get(CONF_ADMIN_USER_IDS)
+                )
+                context = getattr(entry, "context", None)
+                context_user_id = (
+                    context.get("user_id")
+                    if isinstance(context, dict)
+                    else None
+                )
+                await seed_setup_admin(
+                    db,
+                    stored_admin_ids=stored_admin_ids,
+                    context_user_id=context_user_id,
+                    owner_ids=await _async_owner_user_ids(hass),
+                )
+            except BaseException:
+                # A seeding failure must not leak the just-opened
+                # connection: close it before the error propagates, so
+                # HA's setup retry starts from a clean handle (the
+                # first-setup path closes symmetrically).
+                await db.close()
+                raise
             existing.database = db
         entry.runtime_data = existing
         return True
@@ -256,16 +451,73 @@ async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
         await listener_hass.config_entries.async_reload(listener_entry.entry_id)
 
     database = await _async_open_database(hass, await async_get_db_path(hass))
+    remove_update_listener: Callable[[], Any] | None = None
+    remove_time_change_listener: Callable[[], Any] | None = None
     try:
+        # Seed the admin allowlist on first setup so the owner is never
+        # locked out: an empty database takes the persisted admin copy
+        # — the options flow's saved list first (it is the current
+        # one), else the config flow's user from entry data — and only
+        # then the HA user still present on the entry context.  No-op
+        # on a non-empty list (fail-closed narrowing is deliberate).
+        stored_admin_ids = (
+            entry.options.get(CONF_ADMIN_USER_IDS)
+            or entry.data.get(CONF_ADMIN_USER_IDS)
+        )
+        context = getattr(entry, "context", None)
+        context_user_id = (
+            context.get("user_id")
+            if isinstance(context, dict)
+            else None
+        )
+        owner_ids = await _async_owner_user_ids(hass)
+        await seed_setup_admin(
+            database,
+            stored_admin_ids=stored_admin_ids,
+            context_user_id=context_user_id,
+            owner_ids=owner_ids,
+        )
         remove_update_listener = entry.add_update_listener(_async_update_listener)
+        remove_time_change_listener = _register_day_rollover_listener(
+            hass, database, dict(entry.options)
+        )
+        # Backfill any days the daily listener missed while the integration
+        # was off (or freshly installed): run the one idempotent walk over
+        # [today, today + horizon_days] once at setup, using the entry's
+        # configured horizon.  This runs through the SAME path as the daily
+        # listener and regenerate service.
+        await _run_horizon_materialization(
+            hass, database, _configured_horizon_days(dict(entry.options))
+        )
+        _register_regenerate_service(hass)
     except BaseException:
+        # A failure anywhere after the database is open must not leak the
+        # listeners already registered against that (now-closed) database:
+        # unwind EVERY remover we acquired before the failure, keeping the
+        # original error as the one raised.  Removal is best-effort — a
+        # failing remover must not mask the setup error that triggered it.
+        for remove_listener in (
+            remove_time_change_listener,
+            remove_update_listener,
+        ):
+            if remove_listener is None:
+                continue
+            try:
+                result = remove_listener()
+                if inspect.isawaitable(result):
+                    await result
+            except BaseException:
+                pass
         await database.close()
         raise
+    assert remove_update_listener is not None
+    assert remove_time_change_listener is not None
     runtime_data = NestQuestRuntimeData(
         entry_id=entry.entry_id,
         options=dict(entry.options),
         database=database,
         remove_update_listener=remove_update_listener,
+        remove_time_change_listener=remove_time_change_listener,
     )
     entry.runtime_data = runtime_data
     hass.data[DOMAIN][entry.entry_id] = runtime_data
@@ -276,28 +528,47 @@ async def async_unload_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
     """Unload a config entry."""
     domain_data = hass.data.setdefault(DOMAIN, {})
     runtime_data = domain_data.pop(entry.entry_id, None)
-    if not domain_data:
+    is_last = not domain_data
+    if is_last:
         hass.data.pop(DOMAIN, None)
     if runtime_data is None:
         runtime_data = getattr(entry, "runtime_data", None)
+    unload_error: BaseException | None = None
     if runtime_data is not None:
         remove_update_listener = getattr(runtime_data, "remove_update_listener", None)
-        unload_error: BaseException | None = None
+        remove_time_change_listener = getattr(
+            runtime_data, "remove_time_change_listener", None
+        )
         try:
-            if remove_update_listener is not None:
-                result = remove_update_listener()
-                if inspect.isawaitable(result):
-                    await result
-        except BaseException as err:
-            unload_error = err
+            for remove_listener in (
+                remove_update_listener,
+                remove_time_change_listener,
+            ):
+                if remove_listener is None:
+                    continue
+                try:
+                    result = remove_listener()
+                    if inspect.isawaitable(result):
+                        await result
+                except BaseException as err:
+                    # Cancel EVERY listener even when an earlier remover
+                    # raises: a skipped remover would leave a daily
+                    # callback firing against a closed database after
+                    # unload.  The first error is retained and re-raised
+                    # only after both removers (and the DB close) ran.
+                    if unload_error is None:
+                        unload_error = err
         finally:
             database = getattr(runtime_data, "database", None)
             if database is not None:
                 await database.close()
-        if unload_error is not None:
-            if getattr(entry, "runtime_data", None) is not None:
-                entry.runtime_data = None
-            raise unload_error
+    # The ``regenerate`` service is DOMAIN-global: it is torn down only
+    # once the FINAL entry unloads (``hass.data[DOMAIN]`` is now empty),
+    # never when a sibling entry is still loaded.
+    if is_last:
+        _deregister_regenerate_service(hass)
     if getattr(entry, "runtime_data", None) is not None:
         entry.runtime_data = None
+    if unload_error is not None:
+        raise unload_error
     return True

custom_components/nestquest/admin_allowlist.py

@@ -0,0 +1,153 @@
+"""Business layer for the admin allowlist (Feature 03).
+
+Sits between the options flow / Feature 09 service gate and the typed
+:class:`~.dao_children.AdminUsersDao`.  The allowlist stores Home
+Assistant user IDs — never usernames or display names (feature
+guardrail) — and an empty allowlist must fail closed: every function
+here refuses to write an empty allowlist, so the owner can never be
+accidentally locked out of admin operations by a bad save.
+
+Shape policy: a user id is a non-empty trimmed string.  Duplicate ids
+in one write are rejected up front — they would silently map to one
+row and hide a caller bug.  Writes replace the allowlist atomically:
+the diff (additions and removals) is computed and applied inside one
+transaction under the connection-scoped lock shared with the DAOs, so
+a concurrent reader never observes a half-applied sync.
+
+Seed policy (:func:`seed_setup_admin`): the allowlist is seeded only
+when it is EMPTY, so re-running setup never resurrects a deliberately
+narrowed list.  The setup user (the HA user who completed the config
+flow, via the entry context) is added automatically so the owner is
+never locked out on first setup; a stored entry-data copy of the list
+re-seeds a lost database.
+"""
+from __future__ import annotations
+
+import datetime
+import logging
+
+from .dao_children import AdminUsersDao, _connection_lock
+from .db import NestQuestDatabase
+
+LOGGER = logging.getLogger(__name__)
+
+
+def _now_stamp() -> str:
+    """UTC second-precision stamp, matching the registry's policy."""
+    return datetime.datetime.now(datetime.timezone.utc).isoformat(
+        timespec="seconds"
+    )
+
+
+def _validate_user_id(value: object) -> str:
+    """Return ``value`` trimmed; raise unless a non-empty string."""
+    if not isinstance(value, str):
+        raise ValueError(
+            f"admin user id must be a string, got {value!r}"
+        )
+    trimmed = value.strip()
+    if not trimmed:
+        raise ValueError("admin user id must not be empty")
+    return trimmed
+
+
+async def list_admin_ids(database: NestQuestDatabase) -> list[str]:
+    """Return the allowlisted HA user IDs in storage order."""
+    return [row.ha_user_id for row in await AdminUsersDao(database).list()]
+
+
+async def set_admin_ids(
+    database: NestQuestDatabase, user_ids: list[str]
+) -> None:
+    """Replace the allowlist with exactly ``user_ids`` (atomic sync).
+
+    Refuses an empty list — an empty allowlist must fail closed, and
+    the only way to reach one through this API would be removing the
+    last admin, so that removal is refused here with a clear error.
+    Refuses non-string, empty, or duplicate ids up front.  The diff
+    against the current allowlist (additions and removals) applies
+    inside one transaction under the connection lock.
+    """
+    if not isinstance(user_ids, list):
+        raise ValueError("user_ids must be a list of HA user id strings")
+    normalized: list[str] = []
+    for value in user_ids:
+        normalized.append(_validate_user_id(value))
+    if len(set(normalized)) != len(normalized):
+        raise ValueError("user_ids must not contain duplicates")
+    if not normalized:
+        raise ValueError(
+            "refusing to empty the admin allowlist: at least one admin "
+            "must remain (an empty allowlist fails closed)"
+        )
+    dao = AdminUsersDao(database)
+    async with _connection_lock(database):
+        async with database.transaction():
+            current = {row.ha_user_id for row in await dao.list()}
+            target = set(normalized)
+            for user_id in sorted(current - target):
+                await dao.remove(user_id)
+            for user_id in normalized:
+                await dao.add(user_id, _now_stamp())
+
+
+async def is_admin(
+    database: NestQuestDatabase, user_id: object
+) -> bool:
+    """Resolve an HA user ID against the allowlist — FAILS CLOSED.
+
+    True only for an allowlisted user id.  Everything else is False:
+    a non-allowlisted id, an unknown id, a None or non-string value
+    (a service call with no user context), and an empty allowlist
+    (nobody is admin rather than everybody).  The Feature 09 gate
+    wraps every admin-only service with this verdict; it never raises
+    for malformed input — malformed means not admin.
+    """
+    if not isinstance(user_id, str) or not user_id:
+        return False
+    return await AdminUsersDao(database).exists(user_id)
+
+
+async def seed_setup_admin(
+    database: NestQuestDatabase,
+    *,
+    stored_admin_ids: list[str] | None = None,
+    context_user_id: str | None = None,
+    owner_ids: list[str] | None = None,
+) -> list[str]:
+    """Seed an empty allowlist so the owner is never locked out.
+
+    Only acts when the allowlist is EMPTY.  Preference order: the
+    stored persisted copy of the list (the options flow's current
+    selection, then the config flow's original — disaster recovery for
+    a lost database), then the HA user who completed the config flow
+    (``context_user_id``), then — when no caller identity survived at
+    all — every Home Assistant OWNER account (``owner_ids``), so a
+    first setup whose flow context lost the user id still seeds a
+    working admin.  Returns the allowlist after seeding.  Non-empty
+    allowlists are returned untouched — re-running setup must never
+    resurrect a deliberately narrowed list.
+    """
+    dao = AdminUsersDao(database)
+    async with _connection_lock(database):
+        current = [row.ha_user_id for row in await dao.list()]
+        if current:
+            return current
+        candidates: list[str] = []
+        if stored_admin_ids is not None:
+            if not isinstance(stored_admin_ids, list):
+                raise ValueError(
+                    "stored_admin_ids must be a list of HA user id strings"
+                )
+            candidates = [_validate_user_id(value) for value in stored_admin_ids]
+        elif context_user_id is not None:
+            candidates = [_validate_user_id(context_user_id)]
+        elif owner_ids:
+            if not isinstance(owner_ids, list):
+                raise ValueError(
+                    "owner_ids must be a list of HA user id strings"
+                )
+            candidates = [_validate_user_id(value) for value in owner_ids]
+        for user_id in candidates:
+            await dao.add(user_id, _now_stamp())
+        return [row.ha_user_id for row in await dao.list()]

custom_components/nestquest/children.py

@@ -0,0 +1,280 @@
+"""Business layer for the children registry (Feature 03).
+
+Sits between the Feature 09 service gate and the typed
+:class:`~.dao_children.ChildrenDao`: callers get validation, name
+policies and the duplicate-name warning here, and never talk to the
+DAO or SQL directly.  Children are never hard-deleted — deactivation
+is a separate explicit operation (:func:`set_child_active`), so
+completion history keeps its references (feature guardrail).
+
+Name policy: the display name is required and trimmed; an empty or
+whitespace-only name is rejected with ValueError.  A duplicate display
+name is ALLOWED (two children may legitimately share a nickname) but
+logged as a warning so an accidental double-add is visible in the HA
+log.  The duplicate check is case-insensitive and whitespace-normalised
+on both sides, because "ada" and "Ada " are the same name to a parent.
+
+Colour and avatar are optional free-form strings, trimmed when present;
+``sort_order`` is an int with the DAO/schema default of 0.  Clearing an
+optional field back to NULL is deliberately rejected: the DAO's update
+writes only provided fields (it cannot express NULL), so the business
+layer refuses an explicit ``None`` instead of silently ignoring it.
+Timestamps follow the module timestamp policy: the business layer
+stamps UTC ISO-8601 at second precision so every row it creates is
+uniform.
+"""
+from __future__ import annotations
+
+import datetime
+import logging
+
+from .dao_children import ChildRecord, ChildrenDao, _connection_lock
+from .db import NestQuestDatabase
+
+LOGGER = logging.getLogger(__name__)
+
+#: Sentinel distinguishing "argument omitted" from "explicit SQL NULL"
+#: in :func:`edit_child`.
+_UNSET = object()
+
+
+def _now_stamp() -> str:
+    """Return the module's strict UTC second-precision stamp."""
+    return datetime.datetime.now(datetime.timezone.utc).isoformat(
+        timespec="seconds"
+    )
+
+
+def _validate_text(
+    value: object, field: str, *, required: bool = False
+) -> str | None:
+    """Validate a free-text field and return it trimmed.
+
+    ``None`` raises when ``required`` and otherwise returns None.  A
+    non-string value is rejected; an empty result is rejected for
+    required fields (whitespace-only names are empty to a parent).
+    """
+    if value is None:
+        if required:
+            raise ValueError(f"{field} is required")
+        return None
+    if not isinstance(value, str):
+        raise ValueError(f"{field} must be a string, got {value!r}")
+    trimmed = value.strip()
+    if required and not trimmed:
+        raise ValueError(f"{field} is required")
+    return trimmed
+
+
+def _validate_sort_order(value: object) -> int:
+    """Reject non-int sort orders (bools included) before the DAO."""
+    if isinstance(value, bool) or not isinstance(value, int):
+        raise ValueError(f"sort_order must be an integer, got {value!r}")
+    return value
+
+
+def _validate_child_id(value: object) -> int:
+    """Reject non-int child ids (bools included) before any lookup.
+
+    SQLite binds Python bools as integers, so ``True`` would silently
+    address child 1 and a float would round — malformed service input
+    must never mutate the wrong profile.
+    """
+    if isinstance(value, bool) or not isinstance(value, int):
+        raise ValueError(f"child_id must be an integer, got {value!r}")
+    return value
+
+
+async def _warn_on_duplicate_name(
+    database: NestQuestDatabase,
+    display_name: str,
+    *,
+    exclude_child_id: int | None = None,
+) -> None:
+    """Log a warning when ``display_name`` duplicates an existing child.
+
+    Case-insensitive and whitespace-normalised on both sides.  The
+    duplicate is still allowed — this only makes it visible; the log
+    line names both rows so an accidental double-add can be found.
+    ``exclude_child_id`` removes the child being edited from the scan,
+    so an edit only warns when the result collides with a DIFFERENT
+    child's name — including case-only edits, where the self-comparison
+    would otherwise hide a real duplicate.
+    """
+    lowered = display_name.casefold()
+    for child in await ChildrenDao(database).list_all():
+        if exclude_child_id is not None and child.id == exclude_child_id:
+            continue
+        if child.display_name.strip().casefold() == lowered:
+            LOGGER.warning(
+                "Child display name %r duplicates existing child %d "
+                "(%r); allowed, but check this was intentional",
+                display_name,
+                child.id,
+                child.display_name,
+            )
+            return
+
+
+async def create_child(
+    database: NestQuestDatabase,
+    display_name: str,
+    *,
+    colour: str | None = None,
+    avatar_ref: str | None = None,
+    sort_order: int = 0,
+) -> ChildRecord:
+    """Create a child profile and return the stored record.
+
+    The display name is required, trimmed, and rejected when empty.
+    A duplicate display name (case-insensitive) is allowed but logged
+    as a warning.  The scan and the INSERT run inside the
+    connection-scoped lock shared with the DAOs, so a concurrent
+    create of the same normalised name queues behind the first insert
+    and sees it — the duplicate still warns; it can never slip through
+    unlogged.
+    """
+    name = _validate_text(display_name, "display_name", required=True)
+    assert name is not None
+    colour_value = _validate_text(colour, "colour")
+    avatar_value = _validate_text(avatar_ref, "avatar_ref")
+    order = _validate_sort_order(sort_order)
+    async with _connection_lock(database):
+        await _warn_on_duplicate_name(database, name)
+        created = await ChildrenDao(database).create(
+            name,
+            _now_stamp(),
+            colour=colour_value,
+            avatar_ref=avatar_value,
+            sort_order=order,
+        )
+    return created
+
+
+async def edit_child(
+    database: NestQuestDatabase,
+    child_id: int,
+    *,
+    display_name: str | object = _UNSET,
+    colour: str | None | object = _UNSET,
+    avatar_ref: str | None | object = _UNSET,
+    sort_order: int | object = _UNSET,
+) -> ChildRecord:
+    """Edit a child profile and return the updated record.
+
+    Arguments default to the module sentinel ``_UNSET`` meaning "leave
+    this field alone".  An explicitly passed ``None`` for an optional
+    field raises: the DAO's update writes only provided fields and
+    cannot express NULL, so a silent no-op would mask the caller's
+    intent (see the module docstring).  A provided display name is
+    validated like create's; the duplicate scan excludes only the child
+    being edited, so a case-only edit colliding with another child's
+    normalised name still warns.  Raises ValueError when the child does
+    not exist.
+
+    Atomicity: the existence check, the duplicate scan, the UPDATE and
+    the readback all run inside the connection-scoped lock shared with
+    the DAOs, so another edit cannot slip between this call's UPDATE
+    and its readback — the returned record is exactly the one this
+    edit produced, not a later writer's.
+    """
+    _validate_child_id(child_id)
+    async with _connection_lock(database):
+        dao = ChildrenDao(database)
+        existing = await dao.get(child_id)
+        if existing is None:
+            raise ValueError(f"child {child_id} does not exist")
+        updates: dict[str, object] = {}
+        if display_name is not _UNSET:
+            name = _validate_text(
+                display_name, "display_name", required=True
+            )
+            assert name is not None
+            await _warn_on_duplicate_name(
+                database, name, exclude_child_id=child_id
+            )
+            updates["display_name"] = name
+        if colour is not _UNSET:
+            value = _validate_text(colour, "colour")
+            if value is None:
+                raise ValueError(
+                    "clearing colour is not supported; pass a replacement "
+                    "value or omit the field"
+                )
+            updates["colour"] = value
+        if avatar_ref is not _UNSET:
+            value = _validate_text(avatar_ref, "avatar_ref")
+            if value is None:
+                raise ValueError(
+                    "clearing avatar_ref is not supported; pass a "
+                    "replacement value or omit the field"
+                )
+            updates["avatar_ref"] = value
+        if sort_order is not _UNSET:
+            updates["sort_order"] = _validate_sort_order(sort_order)
+        if updates:
+            await dao.update(child_id, **updates)
+        edited = await dao.get(child_id)
+    assert edited is not None
+    return edited
+
+
+async def set_child_active(
+    database: NestQuestDatabase, child_id: int, is_active: bool
+) -> ChildRecord:
+    """Deactivate or reactivate a child; returns the updated record.
+
+    Deactivation hides the child from the panel without deleting their
+    history (feature guardrail); this is the only removal path.
+    ``is_active`` must be a real bool: the DAO's ``int()`` would
+    otherwise silently coerce strings and numerics ("1", 0) into a
+    state the caller never asked for.  Raises ValueError when the
+    child does not exist.
+
+    Atomicity: existence check, UPDATE and readback run inside the
+    connection-scoped lock, so a concurrent opposite transition cannot
+    make this call report the other caller's value.
+    """
+    _validate_child_id(child_id)
+    async with _connection_lock(database):
+        dao = ChildrenDao(database)
+        if await dao.get(child_id) is None:
+            raise ValueError(f"child {child_id} does not exist")
+        if not isinstance(is_active, bool):
+            raise ValueError(
+                f"is_active must be a real bool, got {is_active!r}"
+            )
+        await dao.set_active(child_id, is_active)
+        updated = await dao.get(child_id)
+    assert updated is not None
+    return updated
+
+
+async def reorder_children(
+    database: NestQuestDatabase, ordered_ids: list[int]
+) -> None:
+    """Rewrite the children's panel display order in one transaction.
+
+    ``ordered_ids`` must be a complete permutation of the children
+    table — every child id exactly once.  A partial list (missing an
+    existing child), an unknown id, or a duplicate is rejected with
+    ValueError before any write, so the current order survives a
+    rejected call.  The DAO enforces this inside its own transaction
+    (check and write are     atomic under the connection lock); this
+    wrapper additionally rejects non-integer ids up front, since
+    ``bool`` and floats would silently compare against stored integer
+    ids at the SQL layer.
+    """
+    for child_id in ordered_ids:
+        _validate_child_id(child_id)
+    await ChildrenDao(database).reorder(ordered_ids)
+
+
+async def list_children(
+    database: NestQuestDatabase, *, active_only: bool = False
+) -> list[ChildRecord]:
+    """Return children in display order (sort_order, then id)."""
+    dao = ChildrenDao(database)
+    if active_only:
+        return await dao.list_active()
+    return await dao.list_all()

custom_components/nestquest/completion.py

@@ -0,0 +1,200 @@
+"""Business layer for the completion event log (Feature 08).
+
+Sits between the Feature 09 service gate and the typed
+:class:`~.dao_instances.CompletionEventsDao`: callers get actor-shape
+validation and the UTC occurred-at stamp here, and never talk to the
+DAO or SQL directly.  This module is the only Feature-08 caller of
+:meth:`~.dao_instances.CompletionEventsDao.append`.  Completing and
+un-completing an instance (no-op-if-already-done) arrive in later
+tasks.  Instance current state is derived from the latest event via
+:func:`instance_state` (``open`` / ``done``); there is no status
+column.
+
+Actor policy matches the schema CHECKs (D-008): ``actor_source`` is
+``'user'`` or ``'panel'`` only — never ``'service'``.  ``'user'``
+requires ``actor_user_id`` and forbids ``actor_child_id``; ``'panel'``
+requires ``actor_child_id`` (the tapped profile) and forbids
+``actor_user_id``.  Inverted shapes raise a field-naming ValueError
+before any write.
+
+``occurred_at`` is stamped UTC ISO-8601 at second precision with an
+explicit ``+00:00`` offset, matching the DAO's one accepted shape so
+lexicographic range queries stay exact.  ``was_on_time`` is required
+(True/False) for completed events; un-completions may pass None.  There
+is no permission check here (that is Feature 09).
+"""
+from __future__ import annotations
+
+import datetime
+
+from .dao_children import _connection_lock
+from .dao_instances import (
+    EVENT_COMPLETED,
+    EVENT_UNCOMPLETED,
+    CompletionEventRecord,
+    CompletionEventsDao,
+    QuestInstancesDao,
+)
+from .db import NestQuestDatabase
+
+#: Timestamp policy for completion_events.occurred_at: strict UTC
+#: ISO-8601 with explicit '+00:00' offset (module timestamp policy).
+_UTC_TIMESTAMP_FORMAT = "%Y-%m-%dT%H:%M:%S+00:00"
+
+
+def _now_stamp() -> str:
+    """Return the module's strict UTC second-precision stamp."""
+    return datetime.datetime.now(datetime.timezone.utc).strftime(
+        _UTC_TIMESTAMP_FORMAT
+    )
+
+
+def _stamp_occurred_at(now: datetime.datetime | None) -> str:
+    """Return a DAO-accepted UTC stamp for ``now``, or the current time."""
+    if now is None:
+        return _now_stamp()
+    if not isinstance(now, datetime.datetime):
+        raise ValueError(f"now must be a datetime, got {now!r}")
+    if now.tzinfo is None:
+        raise ValueError("now must be timezone-aware")
+    return now.astimezone(datetime.timezone.utc).strftime(
+        _UTC_TIMESTAMP_FORMAT
+    )
+
+
+def _validate_int_id(value: object, field: str) -> int:
+    """Reject non-int ids (bools included) before any lookup."""
+    if isinstance(value, bool) or not isinstance(value, int):
+        raise ValueError(f"{field} must be an integer, got {value!r}")
+    return value
+
+
+def _validate_event_type(value: object) -> str:
+    """Return a schema-legal event type, or raise naming the field."""
+    if value not in (EVENT_COMPLETED, EVENT_UNCOMPLETED):
+        raise ValueError(
+            f"event_type must be '{EVENT_COMPLETED}' or "
+            f"'{EVENT_UNCOMPLETED}', got {value!r}"
+        )
+    return value
+
+
+def _validate_actor(
+    actor_source: object,
+    actor_user_id: object,
+    actor_child_id: object,
+) -> tuple[str, str | None, int | None]:
+    """Return a schema-legal actor triple, or raise naming the field.
+
+    ``'user'`` requires a non-empty ``actor_user_id`` string and forbids
+    ``actor_child_id``.  ``'panel'`` requires an integer
+    ``actor_child_id`` and forbids ``actor_user_id``.  Any other
+    ``actor_source`` (including ``'service'``) is rejected.
+    """
+    if actor_source not in ("user", "panel"):
+        raise ValueError(
+            f"actor_source must be 'user' or 'panel', got {actor_source!r}"
+        )
+    if actor_source == "user":
+        if not isinstance(actor_user_id, str) or not actor_user_id.strip():
+            raise ValueError("actor_source 'user' requires actor_user_id")
+        if actor_child_id is not None:
+            raise ValueError(
+                "actor_source 'user' must not carry actor_child_id"
+            )
+        return "user", actor_user_id.strip(), None
+    if actor_user_id is not None:
+        raise ValueError("actor_source 'panel' must not carry actor_user_id")
+    if actor_child_id is None:
+        raise ValueError(
+            "actor_source 'panel' requires actor_child_id"
+        )
+    return (
+        "panel",
+        None,
+        _validate_int_id(actor_child_id, "actor_child_id"),
+    )
+
+
+def _validate_was_on_time(
+    event_type: str, was_on_time: object
+) -> bool | None:
+    """Return a real bool or None; completed events require True/False."""
+    if was_on_time is not None and type(was_on_time) is not bool:
+        raise ValueError(
+            f"was_on_time must be True, False or None, got {was_on_time!r}"
+        )
+    if event_type == EVENT_COMPLETED and was_on_time is None:
+        raise ValueError(
+            "a completed event requires was_on_time (True/False)"
+        )
+    return was_on_time
+
+
+async def append_event(
+    database: NestQuestDatabase,
+    instance_id: int,
+    child_id: int,
+    event_type: str,
+    *,
+    actor_source: str,
+    actor_user_id: str | None = None,
+    actor_child_id: int | None = None,
+    was_on_time: bool | None = None,
+    now: datetime.datetime | None = None,
+) -> CompletionEventRecord:
+    """Append one completion or un-completion event and return the row.
+
+    Validates actor shapes and the completed-event on-time requirement
+    before calling :meth:`CompletionEventsDao.append`.  ``occurred_at``
+    is stamped here (UTC ``+00:00``); pass ``now`` to pin the clock.
+    """
+    instance_id = _validate_int_id(instance_id, "instance_id")
+    child_id = _validate_int_id(child_id, "child_id")
+    event_type = _validate_event_type(event_type)
+    actor_source, actor_user_id, actor_child_id = _validate_actor(
+        actor_source, actor_user_id, actor_child_id
+    )
+    was_on_time = _validate_was_on_time(event_type, was_on_time)
+    occurred_at = _stamp_occurred_at(now)
+    return await CompletionEventsDao(database).append(
+        instance_id,
+        child_id,
+        event_type,
+        actor_source,
+        occurred_at,
+        was_on_time,
+        actor_user_id=actor_user_id,
+        actor_child_id=actor_child_id,
+    )
+
+
+async def instance_state(
+    database: NestQuestDatabase,
+    instance_id: int,
+) -> str:
+    """Return ``open`` or ``done`` from the instance's latest event.
+
+    No events, or a latest event of uncompleted, is ``open``.  A latest
+    event of completed is ``done``.  Unknown ``instance_id`` raises
+    ValueError naming the field.  Existence and the latest event are
+    read inside the connection lock so the answer is one snapshot.
+    """
+    instance_id = _validate_int_id(instance_id, "instance_id")
+    async with _connection_lock(database):
+        instance = await QuestInstancesDao(database).get_by_id(instance_id)
+        if instance is None:
+            raise ValueError(
+                f"instance_id: quest instance {instance_id} does not exist"
+            )
+        latest = await CompletionEventsDao(database).get_latest_for_instance(
+            instance_id
+        )
+    if latest is None or latest.event_type == EVENT_UNCOMPLETED:
+        return "open"
+    if latest.event_type == EVENT_COMPLETED:
+        return "done"
+    raise ValueError(
+        f"event_type must be '{EVENT_COMPLETED}' or "
+        f"'{EVENT_UNCOMPLETED}', got {latest.event_type!r}"
+    )

custom_components/nestquest/config_flow.py

@@ -7,7 +7,7 @@ from homeassistant import config_entries
 from homeassistant.core import callback
 from homeassistant.data_entry_flow import FlowResult
 
-from .const import DOMAIN
+from .const import CONF_ADMIN_USER_IDS, DOMAIN
 
 
 class NestQuestConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
@@ -28,7 +28,14 @@ class NestQuestConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
     async def async_step_user(
         self, user_input: dict[str, Any] | None = None
     ) -> FlowResult:
-        """Handle the user step of the config flow."""
+        """Handle the user step of the config flow.
+
+        The HA user completing the flow is persisted into the entry
+        data as the initial admin allowlist copy: real HA does not
+        guarantee the flow context survives to setup, and entry data is
+        the persisted record first setup seeds from — the owner is
+        never locked out.
+        """
         await self.async_set_unique_id(DOMAIN, raise_on_progress=False)
         if self._async_in_progress() or self._async_current_entries():
             return self.async_abort(reason="single_instance_allowed")
@@ -36,4 +43,12 @@ class NestQuestConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
         if user_input is None:
             return self.async_show_form(step_id="user")
 
-        return self.async_create_entry(title="NestQuest", data=user_input)
+        data = dict(user_input)
+        flow_user_id = (
+            self.context.get("user_id")
+            if isinstance(self.context, dict)
+            else None
+        )
+        if flow_user_id:
+            data[CONF_ADMIN_USER_IDS] = [flow_user_id]
+        return self.async_create_entry(title="NestQuest", data=data)

custom_components/nestquest/const.py

@@ -9,6 +9,9 @@ LOGGER = logging.getLogger(LOGGER_NAME)
 
 PLATFORMS: list[str] = []
 
+#: Service name for the on-demand regeneration service (``nestquest.regenerate``).
+SERVICE_REGENERATE = "regenerate"
+
 SQLITE_DB_FILENAME = "nestquest.db"
 
 # Configuration keys and default values
@@ -20,3 +23,34 @@ DEFAULT_DAY_ROLLOVER_TIME = "00:00"
 
 CONF_PANEL_IDLE_TIMEOUT = "panel_idle_timeout"
 DEFAULT_PANEL_IDLE_TIMEOUT = 300
+
+# Admin allowlist (Feature 03): HA user IDs permitted to call admin-only
+# services.  Stored as IDs, never usernames (feature guardrail).  The
+# database allowlist is authoritative; the config entry carries the same
+# list as a disaster-recovery copy so a lost database can be re-seeded.
+CONF_ADMIN_USER_IDS = "admin_user_ids"
+
+# Quest windows (D-008): a definition may declare several day windows;
+# each produces its own instance per day and groups the panel's Quest
+# Log into three columns.  The clock ranges are stored here so they stay
+# configurable later.  Boundaries: a window's end equals the next
+# window's start; classification (Feature 07 materialisation) treats a
+# due time exactly on the boundary as belonging to the LATER window, so
+# 12:00 is afternoon (not morning) and 17:00 is evening (not
+# afternoon).  Times after 21:00 belong to no window.
+WINDOW_MORNING = "morning"
+WINDOW_AFTERNOON = "afternoon"
+WINDOW_EVENING = "evening"
+
+QUEST_WINDOWS: tuple[str, ...] = (
+    WINDOW_MORNING,
+    WINDOW_AFTERNOON,
+    WINDOW_EVENING,
+)
+
+#: Inclusive "HH:MM" bounds per window, in 24-hour local time.
+WINDOW_CLOCK_RANGES: dict[str, tuple[str, str]] = {
+    WINDOW_MORNING: ("00:00", "11:59"),
+    WINDOW_AFTERNOON: ("12:00", "17:00"),
+    WINDOW_EVENING: ("17:00", "21:00"),
+}

custom_components/nestquest/dao_children.py

@@ -191,13 +191,20 @@ class ChildrenDao:
     async def reorder(self, ordered_ids: list[int]) -> None:
         """Persist a new sort order: ``ordered_ids[i]`` gets sort_order i.
 
+        The list must be a COMPLETE permutation of the children table:
+        every existing child id appears exactly once.  Partial lists
+        (missing an existing child) and unknown ids (naming a child
+        that does not exist) are rejected with ValueError BEFORE any
+        write, leaving the current order untouched — a silent partial
+        reorder would leave unlisted children with stale positions and
+        hide a caller bug.  Duplicate ids are rejected up front: they
+        cannot all hold distinct positions, and silently assigning the
+        last occurrence's index would hide a caller bug.
+
         Runs inside one transaction; positions are staged at offset
         -len (all negative, so any permutation of the same ids never
         collides mid-reorder under the wrapper's single-connection
-        serialization), then finalized 0..n-1.  Duplicate ids are
-        rejected up front: they cannot all hold distinct positions, and
-        silently assigning the last occurrence's index would hide a
-        caller bug.
+        serialization), then finalized 0..n-1.
 
         Concurrent reorder() calls on one connection are serialized by
         a connection-scoped asyncio lock (shared across every ChildrenDao
@@ -205,10 +212,10 @@ class ChildrenDao:
         transaction() rejects a second concurrent transaction with
         RuntimeError, so racing callers would crash instead of
         queueing.  The lock makes the second call wait, then run
-        against the first call's final state.
+        against the first call's final state — which also keeps the
+        completeness check honest: the re-read of the table happens
+        inside the same lock and transaction as the writes.
         """
-        if not ordered_ids:
-            return
         if len(set(ordered_ids)) != len(ordered_ids):
             raise ValueError(
                 "reorder() received duplicate child ids; every id must "
@@ -216,6 +223,29 @@ class ChildrenDao:
             )
         async with _connection_lock(self._database):
             async with self._database.transaction():
+                rows = await self._database.fetch_all(
+                    f"SELECT id FROM children"
+                )
+                existing = {row[0] for row in rows}
+                listed = set(ordered_ids)
+                missing = sorted(existing - listed)
+                unknown = sorted(listed - existing)
+                if missing or unknown:
+                    details = []
+                    if missing:
+                        details.append(
+                            f"missing child ids {missing} (a partial "
+                            "reorder would leave them with stale "
+                            "positions)"
+                        )
+                    if unknown:
+                        details.append(
+                            f"unknown child ids {unknown}"
+                        )
+                    raise ValueError(
+                        "reorder() must list every child exactly once; "
+                        + "; ".join(details)
+                    )
                 offset = len(ordered_ids)
                 await self._database.execute_many(
                     "UPDATE children SET sort_order = ? WHERE id = ?",

custom_components/nestquest/dao_instances.py

@@ -15,11 +15,13 @@ event.  A package-wide guard test (bottom of the test module) keeps
 mutation SQL for this table out of every other module.
 
 Upsert semantics: ``QuestInstancesDao.upsert`` is idempotent on
-(definition_id, due_date) — re-running materialization for a date
-whose instance already exists updates nothing that matters
-(child_id/due_time are refreshed only in the degenerate re-generation
-case where they changed) and never duplicates a row.  The schema's
-UNIQUE(definition_id, due_date) is the last line of defense.
+(definition_id, child_id, due_date, window) — re-running
+materialization for a tuple whose instance already exists refreshes
+only the generation-time snapshot columns and never duplicates a row.
+The schema's UNIQUE(definition_id, child_id, due_date, window) is the
+last line of defense.  The upsert refuses a child that is not an
+assignee of the definition and a window outside ``const.QUEST_WINDOWS``
+(D-008 multi-assignee, multi-window model).
 
 ``delete_future_uncompleted`` implements the Feature 06/07 rule that
 reassignment and schedule edits regenerate future instances: it
@@ -35,7 +37,7 @@ import datetime
 from dataclasses import dataclass
 
 from .dao_children import _connection_lock
-from .dao_rules import _validate_date
+from .dao_rules import _validate_date, _validate_window
 from .db import NestQuestDatabase
 
 #: Timestamp policy for completion_events.occurred_at: strict UTC
@@ -45,6 +47,46 @@ from .db import NestQuestDatabase
 _UTC_TIMESTAMP_FORMAT = "%Y-%m-%dT%H:%M:%S+00:00"
 
 
+def _today() -> datetime.date:
+    """Return the current local calendar date (the single date source).
+
+    Every "today" read in this module goes through this one function so
+    the delete clamp and the materialize walk's no-past guard read the
+    same clock, and a caller or test can pin/roll that clock
+    deterministically (e.g. a queued-across-midnight regression).  Pure
+    clock read — no business rule lives here.
+    """
+    return datetime.date.today()
+
+
+def _resolve_today(today: datetime.date | None) -> datetime.date:
+    """Return the caller-resolved "today", or the host date when absent.
+
+    The no-past guard and the delete cutoffs must compare due dates
+    against the SAME calendar date the materialization horizon was built
+    from.  Home Assistant's configured time zone can lag the host clock
+    around midnight, so when the caller has already resolved the local
+    date (``today``) that anchor is authoritative; ``None`` falls back to
+    the host clock (:func:`_today`), which is exactly the previous
+    behavior for callers with no HA-local date.
+    """
+    return _today() if today is None else today
+
+
+def _reject_past(due_date: str, today_iso: str) -> None:
+    """Raise unless ``due_date`` is on or after ``today_iso``.
+
+    The single no-past rule shared by :meth:`QuestInstancesDao.upsert`
+    and :meth:`QuestInstancesDao.upsert_if_valid`: instances are never
+    generated in the past, measured against the resolved "today".
+    """
+    if due_date < today_iso:
+        raise ValueError(
+            f"instances are never generated in the past: due_date "
+            f"{due_date!r} is before today {today_iso!r}"
+        )
+
+
 def _validate_utc_timestamp(value: str, field: str) -> None:
     """Raise ValueError unless ``value`` is a strict UTC ISO-8601 stamp.
 
@@ -88,6 +130,7 @@ class QuestInstanceRecord:
     id: int
     definition_id: int
     child_id: int
+    window: str
     due_date: str
     due_time: str | None
     generated_at: str
@@ -103,16 +146,17 @@ class CompletionEventRecord:
     event_type: str
     actor_source: str
     actor_user_id: str | None
+    actor_child_id: int | None
     occurred_at: str
     was_on_time: bool | None
 
 
 _INSTANCE_COLUMNS = (
-    "id, definition_id, child_id, due_date, due_time, generated_at"
+    "id, definition_id, child_id, window, due_date, due_time, generated_at"
 )
 _EVENT_COLUMNS = (
     "id, instance_id, child_id, event_type, actor_source, actor_user_id, "
-    "occurred_at, was_on_time"
+    "actor_child_id, occurred_at, was_on_time"
 )
 
 #: The only event types the append path accepts; the schema CHECK is
@@ -126,9 +170,10 @@ def _instance_from_row(row: tuple) -> QuestInstanceRecord:
         id=row[0],
         definition_id=row[1],
         child_id=row[2],
-        due_date=row[3],
-        due_time=row[4],
-        generated_at=row[5],
+        window=row[3],
+        due_date=row[4],
+        due_time=row[5],
+        generated_at=row[6],
     )
 
 
@@ -140,8 +185,9 @@ def _event_from_row(row: tuple) -> CompletionEventRecord:
         event_type=row[3],
         actor_source=row[4],
         actor_user_id=row[5],
-        occurred_at=row[6],
-        was_on_time=None if row[7] is None else bool(row[7]),
+        actor_child_id=row[6],
+        occurred_at=row[7],
+        was_on_time=None if row[8] is None else bool(row[8]),
     )
 
 
@@ -158,113 +204,250 @@ class QuestInstancesDao:
         due_date: str,
         generated_at: str,
         *,
+        window: str,
         due_time: str | None = None,
+        today: datetime.date | None = None,
     ) -> QuestInstanceRecord:
-        """Create the dated instance for (definition_id, due_date) idempotently.
+        """Create the dated instance for the widened key idempotently.
 
-        Running materialization twice for the same definition/date
-        yields ONE row: the ON CONFLICT path refreshes the
-        generation-time snapshot columns (child_id, due_time) and
-        regenerates the stamp, but can never create a duplicate — the
-        schema UNIQUE(definition_id, due_date) backs this up.
+        The instance key is (definition_id, child_id, due_date, window)
+        (D-008): running materialization twice for the same tuple
+        yields ONE row — the ON CONFLICT path refreshes the
+        generation-time snapshot columns (due_time) and regenerates the
+        stamp, but can never create a duplicate.  The schema's
+        UNIQUE(definition_id, child_id, due_date, window) backs this
+        up, so the twice-daily case (two windows, one child, one date)
+        yields two rows and the shared case (three assignees, one
+        window) yields three.
 
         Guardrails enforced here:
 
         - ``due_date`` must be TODAY or later: instances are never
           generated in the past (Feature 07).  The caller's
           materialization horizon is future-dated by definition.
+          ``today`` optionally pins the resolved HA-local date the
+          guard compares against (falling back to the host clock when
+          omitted) so a household time zone behind the host around
+          midnight is not misread as "past".
+        - ``window`` must be one of ``const.QUEST_WINDOWS``.
         - An existing instance WITH a completion event is IMMUTABLE:
           the conflict path must not rewrite its snapshot columns
           (Feature 07/08).  The upsert refuses with ValueError in that
           case — silently no-oping would mask a materialization bug.
+        - The child must be an assignee of the definition (D-008
+          multi-assignee model).
 
         The definition must exist (validated atomically under the
         connection lock so a concurrent definition deactivation or
         child deletion cannot slip between check and insert).
         """
         _validate_date(due_date, "due_date")
+        _validate_window(window)
         # Fail fast on obviously-past dates BEFORE queuing on the
         # connection lock (a nice early error); the AUTHORITATIVE
         # check runs after the lock is acquired, because a caller can
         # wait on the lock across midnight — a date that was "today"
         # at call time may be "yesterday" by the time the INSERT runs.
-        today = datetime.date.today().isoformat()
-        if due_date < today:
-            raise ValueError(
-                f"instances are never generated in the past: due_date "
-                f"{due_date!r} is before today {today!r}"
-            )
+        # A caller-supplied ``today`` (HA-local) is used for BOTH
+        # checks and never re-read, since it is already the anchor the
+        # batch runs against.
+        today_date = _resolve_today(today)
+        _reject_past(due_date, today_date.isoformat())
         async with _connection_lock(self._database):
             async with self._database.transaction():
                 # Re-read "today" under the lock: this is the date the
                 # insert actually executes on, so the no-past rule
-                # holds across midnight rollovers.
-                today = datetime.date.today().isoformat()
-                if due_date < today:
-                    raise ValueError(
-                        f"instances are never generated in the past: "
-                        f"due_date {due_date!r} is before today "
-                        f"{today!r}"
-                    )
+                # holds across midnight rollovers.  A pinned HA-local
+                # anchor is exempt from the re-read (see above).
+                if today is None:
+                    today_date = _today()
+                _reject_past(due_date, today_date.isoformat())
                 definition = await self._database.fetch_one(
-                    "SELECT child_id FROM quest_definitions WHERE id = ?",
+                    "SELECT 1 FROM quest_definitions WHERE id = ?",
                     (definition_id,),
                 )
                 if definition is None:
                     raise ValueError(
                         f"quest definition {definition_id} does not exist"
                     )
-                if definition[0] != child_id:
-                    raise ValueError(
-                        f"quest definition {definition_id} is assigned to "
-                        f"child {definition[0]}, not {child_id}; instance "
-                        "must carry the definition's assignee"
-                    )
-                child = await self._database.fetch_one(
-                    "SELECT 1 FROM children WHERE id = ?", (child_id,)
+                assignee = await self._database.fetch_one(
+                    "SELECT 1 FROM quest_definition_assignees "
+                    "WHERE definition_id = ? AND child_id = ?",
+                    (definition_id, child_id),
                 )
-                if child is None:
-                    raise ValueError(f"child {child_id} does not exist")
+                if assignee is None:
+                    raise ValueError(
+                        f"quest definition {definition_id} is not "
+                        f"assigned to child {child_id}; instance must "
+                        "carry an assigned child"
+                    )
                 existing = await self._database.fetch_one(
                     "SELECT 1 FROM completion_events "
                     "WHERE instance_id = (SELECT id FROM quest_instances "
-                    "WHERE definition_id = ? AND due_date = ?)",
-                    (definition_id, due_date),
+                    "WHERE definition_id = ? AND child_id = ? "
+                    "AND due_date = ? AND window = ?)",
+                    (definition_id, child_id, due_date, window),
                 )
                 if existing is not None:
                     raise ValueError(
                         f"instance for (definition {definition_id}, "
-                        f"due_date {due_date!r}) already has a completion "
+                        f"child {child_id}, due_date {due_date!r}, "
+                        f"window {window!r}) already has a completion "
                         "event and is immutable; it cannot be regenerated"
                     )
                 await self._database.execute(
                     "INSERT INTO quest_instances (definition_id, child_id, "
-                    "due_date, due_time, generated_at) "
-                    "VALUES (?, ?, ?, ?, ?) "
-                    "ON CONFLICT (definition_id, due_date) DO UPDATE SET "
-                    "child_id = excluded.child_id, "
+                    "window, due_date, due_time, generated_at) "
+                    "VALUES (?, ?, ?, ?, ?, ?) "
+                    "ON CONFLICT (definition_id, child_id, due_date, "
+                    "window) DO UPDATE SET "
                     "due_time = excluded.due_time, "
                     "generated_at = excluded.generated_at",
                     (
                         definition_id,
                         child_id,
+                        window,
                         due_date,
                         due_time,
                         generated_at,
                     ),
                 )
-                instance = await self.get(definition_id, due_date)
+                instance = await self.get(
+                    definition_id, child_id, due_date, window
+                )
+        assert instance is not None
+        return instance
+
+    async def upsert_if_valid(
+        self,
+        definition_id: int,
+        child_id: int,
+        due_date: str,
+        generated_at: str,
+        *,
+        window: str,
+        due_time: str | None = None,
+        today: datetime.date | None = None,
+    ) -> QuestInstanceRecord | None:
+        """Insert one dated instance iff its tuple is still materializable.
+
+        This is the materialization walk's single write path.  Unlike the
+        generic :meth:`upsert`, which validates only existence and
+        assignment, this method re-validates EVERY materialization
+        precondition in the SAME connection-lock-held transaction as the
+        INSERT — closing the check-then-insert gap a concurrent config
+        write could otherwise slip through:
+
+        - the definition exists AND is active (a definition deactivated
+          after the input snapshot is skipped, never written);
+        - the child exists AND is active (a deactivated child is skipped);
+        - the (definition, child) assignment link still exists (a removed
+          assignment is skipped);
+        - the window is still declared on the definition (a removed window
+          is skipped);
+        - the window's live ``due_time`` still EQUALS the caller-supplied
+          ``due_time`` (NULL-safe: NULL == NULL counts as equal; a window
+          with no due time matches a snapshot with no due time).  A
+          window-time edit landed after the input snapshot makes the
+          caller's ``due_time`` stale, and writing it would overwrite the
+          newer due_time a concurrent regeneration already upserted — so
+          the tuple is skipped instead of written.
+
+        The due_time check closes the one check-then-insert gap this
+        method previously left open: it re-validated every OTHER
+        precondition but then wrote the snapshot's ``due_time``
+        unconditionally, so a stale materialization could clobber a
+        newer, concurrently-regenerated due_time.
+
+        Returns the stored instance, or ``None`` when a precondition
+        failed — the tuple no longer materializable, which the walk SKIPS
+        rather than raising, so the rest of the batch is unaffected.  The
+        no-past rule (instances are never generated in the past) is
+        preserved from :meth:`upsert` and still raises ValueError; ``today``
+        optionally pins the HA-local anchor it compares against.  An
+        instance that ALREADY has a completion event is also skipped
+        (returns ``None``) rather than raised: it is immutable, so the
+        walk leaves it untouched instead of failing the batch — the
+        generic :meth:`upsert` keeps its hard refusal for the
+        delete/regenerate path.
+        """
+        _validate_date(due_date, "due_date")
+        _validate_window(window)
+        # Fail fast on obviously-past dates before queuing on the lock;
+        # the authoritative check re-runs under the lock (see upsert).
+        today_date = _resolve_today(today)
+        _reject_past(due_date, today_date.isoformat())
+        async with _connection_lock(self._database):
+            async with self._database.transaction():
+                if today is None:
+                    today_date = _today()
+                _reject_past(due_date, today_date.isoformat())
+                still_valid = await self._database.fetch_one(
+                    "SELECT 1 FROM quest_definitions d "
+                    "JOIN quest_definition_assignees a "
+                    "ON a.definition_id = d.id "
+                    "JOIN children c ON c.id = a.child_id "
+                    "JOIN quest_definition_windows w "
+                    "ON w.definition_id = d.id "
+                    "WHERE d.id = ? AND a.child_id = ? AND w.window = ? "
+                    "AND d.is_active = 1 AND c.is_active = 1 "
+                    "AND w.due_time IS ? LIMIT 1",
+                    (definition_id, child_id, window, due_time),
+                )
+                if still_valid is None:
+                    # A config change invalidated the tuple since the
+                    # snapshot: skip it rather than abort the batch.
+                    return None
+                existing = await self._database.fetch_one(
+                    "SELECT 1 FROM completion_events "
+                    "WHERE instance_id = (SELECT id FROM quest_instances "
+                    "WHERE definition_id = ? AND child_id = ? "
+                    "AND due_date = ? AND window = ?)",
+                    (definition_id, child_id, due_date, window),
+                )
+                if existing is not None:
+                    # The instance is already completed and therefore
+                    # immutable: the walk SKIPS it (no-op) rather than
+                    # rewriting its snapshot columns or failing the
+                    # batch.  This is the materialization walk's skip,
+                    # distinct from the generic :meth:`upsert` refusal.
+                    return None
+                await self._database.execute(
+                    "INSERT INTO quest_instances (definition_id, child_id, "
+                    "window, due_date, due_time, generated_at) "
+                    "VALUES (?, ?, ?, ?, ?, ?) "
+                    "ON CONFLICT (definition_id, child_id, due_date, "
+                    "window) DO UPDATE SET "
+                    "due_time = excluded.due_time, "
+                    "generated_at = excluded.generated_at",
+                    (
+                        definition_id,
+                        child_id,
+                        window,
+                        due_date,
+                        due_time,
+                        generated_at,
+                    ),
+                )
+                instance = await self.get(
+                    definition_id, child_id, due_date, window
+                )
         assert instance is not None
         return instance
 
     async def get(
-        self, definition_id: int, due_date: str
+        self,
+        definition_id: int,
+        child_id: int,
+        due_date: str,
+        window: str,
     ) -> QuestInstanceRecord | None:
-        """Return the instance for (definition_id, due_date), or None."""
+        """Return the instance for the widened key tuple, or None."""
         row = await self._database.fetch_one(
             f"SELECT {_INSTANCE_COLUMNS} FROM quest_instances "
-            "WHERE definition_id = ? AND due_date = ?",
-            (definition_id, due_date),
+            "WHERE definition_id = ? AND child_id = ? AND due_date = ? "
+            "AND window = ?",
+            (definition_id, child_id, due_date, window),
         )
         return _instance_from_row(row) if row is not None else None
 
@@ -311,7 +494,7 @@ class QuestInstancesDao:
         return [_instance_from_row(row) for row in rows]
 
     async def delete_future_uncompleted(
-        self, definition_id: int, cutoff_date: str
+        self, definition_id: int, cutoff_date: str, *, today: datetime.date | None = None
     ) -> int:
         """Delete the definition's open instances at/after cutoff.
 
@@ -323,9 +506,11 @@ class QuestInstancesDao:
         is measured against TODAY (materialization regenerates the
         rolling horizon from now), so a caller cannot use this to
         rewrite past open instances either — the day-rollover missed
-        sweep (Feature 11) handles past-due instances instead.  Any
-        instance with a completion event is never touched, regardless
-        of its date.  Returns the number deleted.
+        sweep (Feature 11) handles past-due instances instead.  ``today``
+        optionally pins the HA-local anchor the clamp compares against
+        (falling back to the host clock when omitted).  Any instance with
+        a completion event is never touched, regardless of its date.
+        Returns the number deleted.
         """
         _validate_date(cutoff_date, "cutoff_date")
         async with _connection_lock(self._database):
@@ -335,8 +520,8 @@ class QuestInstancesDao:
                 # midnight cannot delete instances that became past
                 # while it waited (backdating is clamped to the
                 # execution date, not the call date).
-                today = datetime.date.today().isoformat()
-                effective_cutoff = max(cutoff_date, today)
+                today_date = _resolve_today(today)
+                effective_cutoff = max(cutoff_date, today_date.isoformat())
                 result = await self._database.execute(
                     "DELETE FROM quest_instances WHERE definition_id = ? "
                     "AND due_date >= ? AND NOT EXISTS ("
@@ -347,6 +532,51 @@ class QuestInstancesDao:
                 )
         return result.rowcount
 
+    async def delete_future_uncompleted_for_child(
+        self, child_id: int, cutoff_date: str, *, today: datetime.date | None = None
+    ) -> tuple[int, str]:
+        """Delete the child's open instances at/after cutoff, across every
+        definition, returning ``(deleted, effective_cutoff)``.
+
+        Child-scoped counterpart to :meth:`delete_future_uncompleted`,
+        used when a child's presence changes (Feature 09): only instances
+        at or after the cutoff with NO completion event are removed, inside
+        one transaction — an instance that gains a completion event
+        mid-flight cannot be deleted.  The cutoff cannot be backdated below
+        today, for the same reason as the definition-scoped method (see its
+        docstring).  ``today`` optionally pins the HA-local anchor the clamp
+        compares against (falling back to the host clock when omitted).
+        Any instance with a completion event is never touched, regardless
+        of its date.
+
+        Returns the number deleted and the effective cutoff that was
+        actually applied (``max(cutoff_date, today)``, read under the
+        lock).  The caller (:func:`~.materialize.regenerate_for_child`)
+        passes that effective cutoff back as its re-materialization anchor,
+        so the delete and the rebuild share ONE execution-day even when the
+        call is queued across midnight — instead of the caller re-reading a
+        stale "today" and materializing a window the delete already
+        superseded.
+        """
+        _validate_date(cutoff_date, "cutoff_date")
+        async with _connection_lock(self._database):
+            async with self._database.transaction():
+                # "today" is read under the lock, matching the
+                # definition-scoped method: the DELETE executes on this
+                # date, so a caller queued across midnight cannot delete
+                # instances that became past while it waited.
+                today_date = _resolve_today(today)
+                effective_cutoff = max(cutoff_date, today_date.isoformat())
+                result = await self._database.execute(
+                    "DELETE FROM quest_instances WHERE child_id = ? "
+                    "AND due_date >= ? AND NOT EXISTS ("
+                    "  SELECT 1 FROM completion_events "
+                    "  WHERE instance_id = quest_instances.id"
+                    ")",
+                    (child_id, effective_cutoff),
+                )
+        return result.rowcount, effective_cutoff
+
 
 class CompletionEventsDao:
     """Typed append-only access to the ``completion_events`` table.
@@ -373,19 +603,21 @@ class CompletionEventsDao:
         was_on_time: bool | None,
         *,
         actor_user_id: str | None = None,
+        actor_child_id: int | None = None,
     ) -> CompletionEventRecord:
         """Append one completion or un-completion event.
 
-        ``actor_source`` is 'user' (with ``actor_user_id`` set) or
-        'panel' (no user id — the tapped child is ``child_id``); the
-        actor-pair CHECK enforces this shape at the schema level.
-        ``occurred_at`` must be the module's one strict UTC shape
-        (YYYY-MM-DDTHH:MM:SS+00:00) so lexicographic range queries
-        stay exact.  ``was_on_time`` is required (True/False) for
-        completions; for un-completions it may be None or the reversed
-        completion's flag (Feature 08 still deciding).  The instance
-        and child must exist — validated atomically under the
-        connection lock.
+        ``actor_source`` is 'user' (an admin action: ``actor_user_id``
+        set, ``actor_child_id`` NULL) or 'panel' (a panel tap: no user
+        id, and ``actor_child_id`` carrying the tapped child profile,
+        D-008); the actor-pair CHECKs enforce this shape at the schema
+        level.  ``occurred_at`` must be the module's one strict UTC
+        shape (YYYY-MM-DDTHH:MM:SS+00:00) so lexicographic range
+        queries stay exact.  ``was_on_time`` is required (True/False)
+        for completions; for un-completions it may be None or the
+        reversed completion's flag (Feature 08 still deciding).  The
+        instance, child and — for panel events — the tapped child must
+        exist — validated atomically under the connection lock.
         """
         if event_type not in (EVENT_COMPLETED, EVENT_UNCOMPLETED):
             raise ValueError(
@@ -405,6 +637,15 @@ class CompletionEventsDao:
             raise ValueError(
                 "actor_source 'panel' must not carry actor_user_id"
             )
+        if actor_source == "panel" and actor_child_id is None:
+            raise ValueError(
+                "actor_source 'panel' requires actor_child_id "
+                "(the tapped child profile)"
+            )
+        if actor_source == "user" and actor_child_id is not None:
+            raise ValueError(
+                "actor_source 'user' must not carry actor_child_id"
+            )
         if was_on_time is not None and type(was_on_time) is not bool:
             raise ValueError(
                 f"was_on_time must be True, False or None, got "
@@ -435,16 +676,28 @@ class CompletionEventsDao:
                 )
                 if child is None:
                     raise ValueError(f"child {child_id} does not exist")
+                if actor_child_id is not None:
+                    tapped = await self._database.fetch_one(
+                        "SELECT 1 FROM children WHERE id = ?",
+                        (actor_child_id,),
+                    )
+                    if tapped is None:
+                        raise ValueError(
+                            f"actor_child_id {actor_child_id} does not "
+                            "reference an existing child"
+                        )
                 result = await self._database.execute(
                     "INSERT INTO completion_events (instance_id, child_id, "
-                    "event_type, actor_source, actor_user_id, occurred_at, "
-                    "was_on_time) VALUES (?, ?, ?, ?, ?, ?, ?)",
+                    "event_type, actor_source, actor_user_id, "
+                    "actor_child_id, occurred_at, was_on_time) "
+                    "VALUES (?, ?, ?, ?, ?, ?, ?, ?)",
                     (
                         instance_id,
                         child_id,
                         event_type,
                         actor_source,
                         actor_user_id,
+                        actor_child_id,
                         occurred_at,
                         None if was_on_time is None else int(was_on_time),
                     ),

custom_components/nestquest/dao_presence.py

@@ -186,6 +186,15 @@ class PresenceOverridesDao:
         The child must exist (validated atomically under the
         connection lock).  Date shape is validated strictly, and the
         schema CHECK rejects end < start.
+
+        Overlap policy (Feature 05): an override for a child may not
+        overlap another override of the SAME child — two different
+        present/absent answers for one date are unresolvable.  The
+        overlap check (inclusive boundaries) runs inside the same
+        transaction as the INSERT, so a racing create cannot slip a
+        conflicting override between the check and the write; a
+        conflict raises ValueError naming the conflicting override's
+        id and range.
         """
         _validate_date(start_date, "start_date")
         _validate_date(end_date, "end_date")
@@ -196,6 +205,29 @@ class PresenceOverridesDao:
                 )
                 if child is None:
                     raise ValueError(f"child {child_id} does not exist")
+                # Only a well-ordered range has overlap semantics:
+                # inverted ranges fall through to the INSERT and hit
+                # the schema's end>=start CHECK, preserving the
+                # IntegrityError contract the matrix tests rely on.
+                if end_date >= start_date:
+                    conflicting = await self._database.fetch_one(
+                        f"SELECT {_OVERRIDE_COLUMNS} "
+                        "FROM presence_overrides "
+                        "WHERE child_id = ? AND end_date >= ? "
+                        "AND start_date <= ? ORDER BY id LIMIT 1",
+                        (child_id, start_date, end_date),
+                    )
+                else:
+                    conflicting = None
+                if conflicting is not None:
+                    conflict = _override_from_row(conflicting)
+                    raise ValueError(
+                        f"override for child {child_id} "
+                        f"[{start_date}, {end_date}] overlaps existing "
+                        f"override {conflict.id} "
+                        f"[{conflict.start_date}, {conflict.end_date}] "
+                        f"(is_present={conflict.is_present})"
+                    )
                 result = await self._database.execute(
                     "INSERT INTO presence_overrides (child_id, "
                     "start_date, end_date, is_present, note) "
@@ -244,4 +276,59 @@ class PresenceOverridesDao:
             "DELETE FROM presence_overrides WHERE id = ?",
             (override_id,),
         )
-        return result.rowcount > 0
+        return result.rowcount > 0
+
+
+async def read_snapshot_unlocked(
+    database: NestQuestDatabase,
+    child_ids: list[int],
+    range_start: str,
+    range_end: str,
+) -> tuple[
+    dict[int, PresenceScheduleRecord],
+    dict[int, list[PresenceOverrideRecord]],
+]:
+    """Read schedules and overrides for ``child_ids`` WITHOUT locking.
+
+    MUST be called inside the connection lock and an open transaction, so
+    the schedules and overrides returned here stay coherent with every
+    other table the caller reads inside that same transaction (the
+    materialization walk's single input snapshot does exactly that).  The
+    date range comes already validated by the caller.
+
+    Returns ``(schedules, overrides)``:
+
+    - ``schedules`` maps ``child_id`` to its :class:`PresenceScheduleRecord`
+      for every child that HAS a schedule row.  A child absent from the
+      mapping has no schedule, i.e. is present every day (Feature 05).
+    - ``overrides`` maps ``child_id`` to that child's overrides overlapping
+      ``[range_start, range_end]`` (inclusive boundaries), ordered by start
+      date; a child with no matching override is absent from the mapping.
+
+    ``child_ids`` must name existing children (the caller derives them
+    from a trusted snapshot, within the same transaction).
+    """
+    children = sorted(set(child_ids))
+    if not children:
+        return {}, {}
+    placeholders = ",".join("?" for _ in children)
+    schedule_rows = await database.fetch_all(
+        f"SELECT {_SCHEDULE_COLUMNS} FROM presence_schedules "
+        f"WHERE child_id IN ({placeholders})",
+        tuple(children),
+    )
+    override_rows = await database.fetch_all(
+        f"SELECT {_OVERRIDE_COLUMNS} FROM presence_overrides "
+        f"WHERE child_id IN ({placeholders}) AND end_date >= ? "
+        "AND start_date <= ? ORDER BY start_date",
+        tuple(children) + (range_start, range_end),
+    )
+    schedules = {
+        record.child_id: record
+        for record in map(_schedule_from_row, schedule_rows)
+    }
+    overrides: dict[int, list[PresenceOverrideRecord]] = {}
+    for row in override_rows:
+        record = _override_from_row(row)
+        overrides.setdefault(record.child_id, []).append(record)
+    return schedules, overrides

custom_components/nestquest/materialize.py

@@ -0,0 +1,377 @@
+"""The materialization walk (Feature 07 core).
+
+:func:`materialize` turns the schedule rules + custody presence of the
+active quest definitions into concrete ``quest_instances`` rows over a
+date range.  It is the pure walk over definitions x dates x assignees x
+windows; HA scheduling (day-rollover triggers) is a separate later
+task and lives elsewhere.
+
+The walk is deterministic and idempotent:
+
+- All inputs — the active definitions with their rules, assignees and
+  windows, AND the assignee children's presence schedules and scoped
+  overrides — are read inside ONE locked transaction (see
+  :func:`~.dao_rules.load_materialization_input`), so the walk sees a
+  single coherent snapshot rather than a definition state from one
+  instant and a presence state from another.
+- Presence is snapshotted into an immutable
+  :class:`~.presence.PresenceEngine` from that same coherent read.
+- For each date in the range, each definition whose decoded rule
+  :func:`~.recurrence.occurs_on` on that date, each assignee who is
+  ``is_present`` on that date and each declared window, one instance is
+  written through :class:`~.dao_instances.QuestInstancesDao.upsert_if_valid`
+  with a ``generated_at`` stamp shared by the whole batch (one coherent
+  time per run).
+
+A config change that lands AFTER the snapshot is read but BEFORE a
+tuple's write (an assignment removed, a definition or child deactivated,
+a window removed) makes that tuple SKIP rather than abort the batch:
+:meth:`~.dao_instances.QuestInstancesDao.upsert_if_valid` re-validates
+every materialization precondition (active definition, active child,
+live assignment, declared window, and its CURRENT ``due_time``) inside
+the SAME transaction as the INSERT, so the check and the write cannot be
+split by a racing config edit.
+
+The upsert is idempotent on (definition_id, child_id, due_date,
+window), so re-running the materialization over the same range never
+duplicates a row; a tuple whose instance is already completed is SKIPPED
+(never rewritten, never raised) by
+:meth:`~.dao_instances.QuestInstancesDao.upsert_if_valid`.
+
+Regeneration: a config or presence change must rebuild future instances
+so they track the new state.  :func:`regenerate_for_definition` covers
+definition edits / reassignment (Features 06/07); :func:`regenerate_for_child`
+covers a single child's presence change (Feature 09).  Both delete the
+affected open instances at or after today — never a completed instance,
+never the past — and re-run the walk over the rolling horizon
+``[today, today + horizon_days]`` (``horizon_days`` defaults to
+``DEFAULT_HORIZON_DAYS``).
+
+HOOK (Feature 09 presence services): the presence business layer that
+lands in Feature 09 MUST call :func:`regenerate_for_child` after EVERY
+presence-state write so a child's future instances track its presence:
+``set_presence_pattern`` (including clearing/setting an empty pattern),
+deleting/clearing the presence schedule
+(:meth:`~.dao_presence.PresenceSchedulesDao.delete`),
+``create_presence_override``, and ``delete_presence_override``.  A
+schedule delete changes presence state too (the child becomes
+always-present), so it must regenerate just like the others.  This hook
+is documented, not yet wired: no presence business layer exists yet, and
+the presence DAO (``dao_presence.py``) must stay free of business rules
+— never call :func:`regenerate_for_child` from inside the DAO layer.
+"""
+from __future__ import annotations
+
+import datetime
+
+from .const import DEFAULT_HORIZON_DAYS
+from .dao_instances import QuestInstancesDao, _resolve_today
+from .dao_rules import (
+    _validate_date,
+    load_materialization_input,
+    schedule_rule_from_storage,
+    schedule_rule_storage_from_record,
+)
+from .db import NestQuestDatabase
+from .presence import PresenceEngine, PresenceOverride, PresenceSchedule
+from .recurrence import ScheduleRule, occurs_on
+
+
+def _now_stamp() -> str:
+    """Return the batch's shared UTC second-precision generation stamp."""
+    return datetime.datetime.now(datetime.timezone.utc).isoformat(
+        timespec="seconds"
+    )
+
+
+def _resolve_horizon_days(horizon_days: int | None) -> int:
+    """Validate a regeneration horizon and return the resolved day count.
+
+    ``None`` resolves to :data:`~.const.DEFAULT_HORIZON_DAYS`.  A bool
+    (SQLite would happily bind ``True``/``False`` onto an int), a non-int,
+    or a value below 1 raises ValueError naming the field — the validation
+    runs BEFORE any future-instance delete so a malformed horizon can never
+    delete rows it then fails to rebuild.  A negative horizon would
+    otherwise delete first and only then be rejected by
+    :func:`materialize`'s inverted-range check; ``0``/``False`` would
+    silently shrink the window to a single day.
+    """
+    if horizon_days is None:
+        return DEFAULT_HORIZON_DAYS
+    if (
+        isinstance(horizon_days, bool)
+        or not isinstance(horizon_days, int)
+        or horizon_days < 1
+    ):
+        raise ValueError(
+            f"horizon_days must be a positive integer, got {horizon_days!r}"
+        )
+    return horizon_days
+
+
+def _decode_rule(snapshot) -> ScheduleRule:
+    """Decode a snapshot's rule record back into a ScheduleRule.
+
+    The record carried by the snapshot is the one the definition
+    referenced at read time, so decoding it here (rather than re-reading
+    through ``ScheduleRulesDao``) preserves the coherence the snapshot
+    guarantees.
+    """
+    return schedule_rule_from_storage(
+        schedule_rule_storage_from_record(snapshot.rule)
+    )
+
+
+def _build_engine(
+    schedules_records,
+    overrides_records,
+) -> PresenceEngine:
+    """Convert raw presence records into an immutable PresenceEngine."""
+    schedules: dict[int, PresenceSchedule] = {}
+    for child_id, record in schedules_records.items():
+        schedules[child_id] = PresenceSchedule.decode(
+            child_id, record.anchor_date, record.pattern
+        )
+    overrides: dict[int, list[PresenceOverride]] = {}
+    for child_id, records in overrides_records.items():
+        overrides[child_id] = [
+            PresenceOverride(
+                record.child_id,
+                record.start_date,
+                record.end_date,
+                record.is_present,
+                record.note,
+            )
+            for record in records
+        ]
+    return PresenceEngine(schedules, overrides)
+
+
+async def materialize(
+    database: NestQuestDatabase,
+    start_date: str,
+    end_date: str,
+    *,
+    child_ids: list[int] | None = None,
+    today: datetime.date | None = None,
+) -> int:
+    """Generate quest instances for the closed range [start_date, end_date].
+
+    ``start_date`` and ``end_date`` must be strict ISO calendar dates
+    (YYYY-MM-DD) with ``end_date`` on or after ``start_date``; anything
+    else raises ValueError naming the offending field.  Returns the number
+    of instances upserted for the range (idempotent — a re-run refreshes
+    the same rows, never duplicates them).
+
+    ``child_ids`` optionally scopes the walk to exactly those children:
+    assignees outside the list are never written, so a caller that only
+    wants one child's instances rebuilt (e.g. :func:`regenerate_for_child`
+    after a presence change) cannot touch any unrelated child's rows.
+    When omitted (or None) the walk covers every assignee as before.
+
+    ``today`` optionally pins the resolved HA-local date the walk's
+    no-past guard compares against; it is threaded into every
+    :meth:`~.dao_instances.QuestInstancesDao.upsert_if_valid` write.  When
+    omitted the host clock (``datetime.date.today``) is used, which is the
+    historical default.  A caller that computed the horizon in Home
+    Assistant's configured time zone MUST pass that same date here so a
+    time zone behind the host around midnight is not rejected as "past".
+
+    ``start_date`` is clamped up to the resolved "today" (the same
+    ``today`` anchor threaded into the no-past guard), so a caller that
+    passes a ``start_date`` already in the past never yields a
+    past-dated instance: the walk simply begins on today and skips every
+    earlier date.  A range entirely in the past therefore produces zero
+    instances rather than an error, and the DAO's no-past guard remains
+    the authoritative backstop under the lock.
+
+    All inputs are read in ONE locked transaction; each tuple's write then
+    goes through the atomic :meth:`~.dao_instances.QuestInstancesDao.upsert_if_valid`,
+    which re-validates the tuple and its current ``due_time`` in the same
+    transaction as the INSERT, so a config change that arrives mid-batch
+    skips the affected tuples rather than aborting the batch or leaving a
+    partial result.
+    """
+    _validate_date(start_date, "start_date")
+    _validate_date(end_date, "end_date")
+    if end_date < start_date:
+        raise ValueError(
+            f"end_date must be on or after start_date, got "
+            f"{end_date!r} < {start_date!r}"
+        )
+
+    snapshots, schedules_records, overrides_records = await (
+        load_materialization_input(database, start_date, end_date)
+    )
+    engine = _build_engine(schedules_records, overrides_records)
+    child_filter = None if child_ids is None else set(child_ids)
+
+    definitions = [
+        (snapshot.definition.id, _decode_rule(snapshot),
+         snapshot.assignees, snapshot.windows)
+        for snapshot in snapshots
+    ]
+
+    generated_at = _now_stamp()
+    instances = QuestInstancesDao(database)
+
+    start = datetime.datetime.strptime(start_date, "%Y-%m-%d").date()
+    end = datetime.datetime.strptime(end_date, "%Y-%m-%d").date()
+
+    # Clamp a past start up to today (the HA-local anchor when the caller
+    # pinned one, else the host clock) so the walk can never emit a
+    # past-dated instance; the DAO's no-past guard remains the backstop.
+    # A range entirely in the past therefore yields zero instances.
+    today_date = _resolve_today(today)
+    start = max(start, today_date)
+
+    count = 0
+    cursor = start
+    while cursor <= end:
+        iso = cursor.isoformat()
+        for definition_id, rule, assignees, windows in definitions:
+            if not occurs_on(rule, cursor):
+                continue
+            for child in assignees:
+                if child_filter is not None and child.id not in child_filter:
+                    continue
+                if not engine.is_present(child.id, cursor):
+                    continue
+                for window in windows:
+                    written = await instances.upsert_if_valid(
+                        definition_id,
+                        child.id,
+                        iso,
+                        generated_at,
+                        window=window.window,
+                        due_time=window.due_time,
+                        today=today,
+                    )
+                    if written is not None:
+                        count += 1
+        cursor += datetime.timedelta(days=1)
+    return count
+
+
+async def regenerate_for_definition(
+    database: NestQuestDatabase,
+    definition_id: int,
+    *,
+    today: datetime.date | None = None,
+    horizon_days: int | None = None,
+) -> int:
+    """Regenerate a definition's future instances after a config change.
+
+    The Feature 06 edit/assignment/activation paths call this after a
+    successful write so future instances track the new state: the
+    definition's open instances at or after today are deleted (never a
+    completed instance, never the past) via
+    :meth:`~.dao_instances.QuestInstancesDao.delete_future_uncompleted`,
+    then the materialization walk re-runs over the rolling horizon
+    ``[today, today + horizon_days]`` so the (changed) rule,
+    assignee set and windows re-materialize against today's state.
+
+    "today" is computed the same way the walk computes it —
+    :func:`~.dao_instances._today` — so the delete cutoff and the
+    re-materialization range share one anchor, and the walk's
+    ``upsert_if_valid`` no-past guard never rejects the regenerated
+    range.  ``today`` optionally pins a caller-resolved HA-local date
+    (threaded into both the delete cutoff and the re-materialization)
+    so a household time zone behind the host around midnight stays
+    consistent.  ``horizon_days`` sizes the re-materialization window;
+    when omitted it falls back to :data:`~.const.DEFAULT_HORIZON_DAYS`.
+    A bool, non-int, or sub-1 value raises ValueError BEFORE any delete.
+    Returns the number of instances the re-materialization
+    upserted across the whole snapshot (idempotent — other active
+    definitions' tuples refresh in place, never duplicate).
+    """
+    horizon = _resolve_horizon_days(horizon_days)
+    today_date = _resolve_today(today)
+    start_date = today_date.isoformat()
+    end_date = (
+        today_date + datetime.timedelta(days=horizon)
+    ).isoformat()
+
+    instances = QuestInstancesDao(database)
+    await instances.delete_future_uncompleted(
+        definition_id, start_date, today=today
+    )
+    return await materialize(database, start_date, end_date, today=today)
+
+
+# HOOK (Feature 09 presence services): ``regenerate_for_child`` is the
+# child-presence counterpart to ``regenerate_for_definition``.  The
+# presence business layer that lands in Feature 09 MUST call
+# ``regenerate_for_child`` after EVERY presence-state write, so future
+# instances track a child's changed presence: set_presence_pattern
+# (including clearing/setting an empty pattern), deleting/clearing the
+# presence schedule (PresenceSchedulesDao.delete),
+# create_presence_override, and delete_presence_override.  A schedule
+# delete changes presence state too (the child becomes always-present),
+# so it must regenerate just like the others.  It is deliberately NOT
+# wired into ``dao_presence.py``: the DAO layer stays pure storage (no
+# business rules), and no presence business layer exists yet to host the
+# call — see the module docstring note above.
+async def regenerate_for_child(
+    database: NestQuestDatabase,
+    child_id: int,
+    *,
+    today: datetime.date | None = None,
+    horizon_days: int | None = None,
+) -> int:
+    """Regenerate a child's future instances after a presence change.
+
+    The Feature 09 presence services call this after every
+    presence-state write — set_presence_pattern (including clearing or
+    setting an empty pattern), deleting/clearing the presence schedule
+    (:meth:`~.dao_presence.PresenceSchedulesDao.delete`),
+    create_presence_override, and delete_presence_override — so a
+    child's future instances track its new presence: the child's open
+    instances at or after today are deleted across ALL its definitions
+    (never a completed instance, never the past) via
+    :meth:`~.dao_instances.QuestInstancesDao.delete_future_uncompleted_for_child`,
+    then the materialization walk re-runs over the rolling horizon
+    ``[today, today + horizon_days]`` scoped to that child only,
+    so the child's now-absent/present dates re-materialize against
+    today's presence WITHOUT touching any other child's rows.
+
+    ``child_id`` must be a plain int — bool and float are rejected
+    (SQLite binds a bool as 0/1 and a float would round, so a malformed
+    id must never mutate the wrong profile).
+
+    "today" is computed the same way the walk computes it —
+    :func:`~.dao_instances._today` — and the re-materialization range uses the
+    delete's returned effective cutoff (see
+    :meth:`~.dao_instances.QuestInstancesDao.delete_future_uncompleted_for_child`),
+    so the delete cutoff and the re-materialization window share ONE
+    execution-day anchor even when the call is queued across midnight.
+    ``today`` optionally pins a caller-resolved HA-local date, threaded
+    into the delete cutoff and the re-materialization for the same
+    host-vs-HA time-zone consistency.  ``horizon_days`` sizes the
+    re-materialization window; when omitted it falls back to
+    :data:`~.const.DEFAULT_HORIZON_DAYS`.  A bool, non-int, or sub-1 value
+    raises ValueError BEFORE any delete.  Returns the number of instances
+    the re-materialization upserted for the child across the whole
+    snapshot.
+    """
+    if isinstance(child_id, bool) or not isinstance(child_id, int):
+        raise ValueError(f"child_id must be an integer, got {child_id!r}")
+
+    horizon = _resolve_horizon_days(horizon_days)
+    today_date = _resolve_today(today)
+
+    instances = QuestInstancesDao(database)
+    # Use the delete's returned effective cutoff as the materialize anchor,
+    # NOT the independently-computed "today" above.  If the call is queued
+    # across midnight the delete clamps its cutoff to the execution-day;
+    # materializing from the stale "today" (now yesterday) would trip the
+    # walk's no-past guard and leave the child's future instances deleted
+    # but not rebuilt.  One anchor for both keeps them consistent.
+    _, effective_cutoff = await instances.delete_future_uncompleted_for_child(
+        child_id, today_date.isoformat(), today=today
+    )
+    start = datetime.date.fromisoformat(effective_cutoff)
+    end_date = (start + datetime.timedelta(days=horizon)).isoformat()
+    return await materialize(
+        database, start.isoformat(), end_date, child_ids=[child_id], today=today
+    )

custom_components/nestquest/migrations.py

@@ -20,15 +20,25 @@ instead of the legacy ``task_*`` spellings, and no compatibility shim
 exists.  Dev machines that already hold a version-1 database with
 ``task_*`` tables are handled by migration 2, which detects the legacy
 table names and ``ALTER TABLE ... RENAME TO``s them to their current
-names before anything else assumes the new model.  The rename step runs
-inside the same transaction as its version stamp, so a crash mid-rename
-rolls both back together.
+names before anything else assumes the new model.  Migration 3 brings
+pre-D-008 databases to the multi-assignee model: it creates
+``quest_definition_assignees`` and, when ``quest_definitions`` still
+carries a single ``child_id`` column, rebuilds the table without it,
+copying each definition's assignee across.  Migration 4 adds the
+windows table, migration 5 rebuilds ``quest_instances`` onto the
+widened (definition_id, child_id, due_date, window) key, and migration
+6 rebuilds ``completion_events`` with the D-008 ``actor_child_id``
+column.  Each callable migration runs inside its own transaction
+together with its version stamp, so a crash mid-step rolls the
+statements and the stamp back together.
 
 Migration entries are either an ordered sequence of SQL statements or
-an async callable taking the open database.  Callables exist for steps
-whose SQL depends on the database's current state (the legacy rename
-only fires when a legacy table is actually present) and run under the
-same per-migration transaction as statement lists.
+an async callable taking ``(database, target_version)``.  Callables
+exist for steps whose SQL depends on the database's current state (a
+legacy rename only fires when a legacy table is present; a rebuild only
+when the old column shape is present) and own their transaction so they
+can bracket it with connection pragmas the runner's uniform transaction
+cannot express.
 
 Each migration's statements and its version stamp run inside ONE
 transaction, and the stamp is written as DELETE + INSERT rather than
@@ -63,13 +73,24 @@ from collections.abc import Awaitable, Callable, Sequence
 from typing import Union
 
 from .db import NestQuestDatabase
-from .schema import SCHEMA_V1_STATEMENTS
+from .schema import (
+    COMPLETION_EVENTS_TABLE_SQL,
+    QUEST_DEFINITIONS_TABLE_SQL,
+    QUEST_INSTANCES_TABLE_SQL,
+    SCHEMA_V1_STATEMENTS,
+    SCHEMA_V1_QUEST_DEFINITION_ASSIGNEES_DDL,
+    SCHEMA_V1_QUEST_DEFINITION_WINDOWS_DDL,
+)
 
 LOGGER = logging.getLogger(__name__)
 
 #: One migration entry: either an ordered sequence of SQL statements or
-#: an async callable run under the entry's migration transaction.
-MigrationStep = Union[Sequence[str], Callable[[NestQuestDatabase], Awaitable[None]]]
+#: an async callable taking ``(database, target_version)`` that manages
+#: its own transaction and stamps via :func:`stamp_schema_version`.
+MigrationStep = Union[
+    Sequence[str],
+    Callable[[NestQuestDatabase, int], Awaitable[None]],
+]
 
 #: Metadata table holding the applied schema version.  Prefixed with the
 #: integration domain so a config directory shared with other tools can
@@ -94,6 +115,10 @@ VERSION_TABLE_DDL = f"""
 #: version ``n-1`` to version ``n``.
 MIGRATION_1_V1_DDL: list[str] = list(SCHEMA_V1_STATEMENTS)
 
+#: The assignees table DDL, shared with migration 1 via the schema
+#: module so a rebuilt and a freshly created table cannot drift.
+_ASSIGNEES_TABLE_DDL: str = SCHEMA_V1_QUEST_DEFINITION_ASSIGNEES_DDL[0]
+
 #: Legacy (pre-D-007) table name -> current table name.  Order matters:
 #: the parent table renames first so the child's foreign key reference
 #: is rewritten while its parent's new name is already in place.
@@ -103,7 +128,42 @@ LEGACY_TASK_TABLE_RENAMES: tuple[tuple[str, str], ...] = (
 )
 
 
-async def _rename_legacy_task_tables(database: NestQuestDatabase) -> None:
+async def stamp_schema_version(
+    database: NestQuestDatabase, version: int
+) -> None:
+    """Write the schema version stamp (inside the caller's transaction).
+
+    INSERT keyed on the singleton row (id = 1) with an upsert: a fresh
+    file has no row yet, so UPDATE alone would silently match zero rows
+    there and leave a migrated-but-unstamped database.
+    """
+    await database.execute(
+        f"INSERT INTO {VERSION_TABLE} (id, version) "
+        "VALUES (1, ?) "
+        "ON CONFLICT (id) DO UPDATE SET version = excluded.version",
+        (version,),
+    )
+
+
+async def _table_has_column(
+    database: NestQuestDatabase, table: str, column: str
+) -> bool:
+    """Return True when ``table`` currently carries ``column``."""
+    rows = await database.fetch_all(f"PRAGMA table_info({table})")
+    return any(row[1] == column for row in rows)
+
+
+#: Window assigned to instances migrated from the pre-window instance
+#: shape (D-008).  Pre-window rows were generated for whole-day
+#: obligations; the morning window is the documented default landing
+#: spot, and future dates are regenerated with real window declarations
+#: by materialization (delete_future_uncompleted + re-run).
+LEGACY_MIGRATED_WINDOW = "morning"
+
+
+async def _rename_legacy_task_tables(
+    database: NestQuestDatabase, target_version: int
+) -> None:
     """Rename any surviving ``task_*`` tables to their ``quest_*`` names.
 
     Dev-machines-only path (D-007): a database stamped version 1 by the
@@ -112,22 +172,228 @@ async def _rename_legacy_task_tables(database: NestQuestDatabase) -> None:
     nothing and this step is a no-op.  Modern SQLite rewrites foreign
     key clauses in other tables to follow the rename, so the renamed
     schema is indistinguishable from a freshly created one apart from
-    internal autoindex names.  Runs inside the migration transaction,
-    so the renames and the version stamp commit or roll back together.
+    internal autoindex names.  Runs in its own transaction together
+    with the version stamp, so a crash rolls both back.
     """
-    for legacy_name, current_name in LEGACY_TASK_TABLE_RENAMES:
-        row = await database.fetch_one(
-            "SELECT 1 FROM sqlite_master WHERE type = 'table' "
-            "AND name = ?",
-            (legacy_name,),
-        )
-        if row is not None:
-            await database.execute(
-                f'ALTER TABLE "{legacy_name}" RENAME TO "{current_name}"'
-            )
-            LOGGER.info(
-                "Renamed legacy table %s to %s", legacy_name, current_name
+    async with database.transaction():
+        for legacy_name, current_name in LEGACY_TASK_TABLE_RENAMES:
+            row = await database.fetch_one(
+                "SELECT 1 FROM sqlite_master WHERE type = 'table' "
+                "AND name = ?",
+                (legacy_name,),
             )
+            if row is not None:
+                await database.execute(
+                    f'ALTER TABLE "{legacy_name}" RENAME TO "{current_name}"'
+                )
+                LOGGER.info(
+                    "Renamed legacy table %s to %s",
+                    legacy_name,
+                    current_name,
+                )
+        await stamp_schema_version(database, target_version)
+
+
+async def _add_definition_assignees(
+    database: NestQuestDatabase, target_version: int
+) -> None:
+    """Bring definitions to the multi-assignee model (D-008).
+
+    Two shapes arrive here:
+
+    - Fresh or renamed databases whose ``quest_definitions`` already
+      matches the current canonical DDL (no ``child_id`` column): only
+      the assignees table needs creating (``IF NOT EXISTS`` is a no-op
+      when migration 1 already made it).
+    - Databases stamped at version 2 whose ``quest_definitions`` still
+      carries the single ``child_id`` column: the table is rebuilt via
+      SQLite's canonical procedure — create the new table, copy rows,
+      move each definition's assignee into
+      ``quest_definition_assignees``, drop the old table, rename — so
+      ``DROP COLUMN``'s foreign-key restriction never applies and no
+      definition or instance row is lost.
+
+    The copy runs with ``foreign_keys = OFF`` because dropping the old
+    table under enforcement would fire the implicit DELETE and violate
+    the ``quest_instances`` foreign key; ``PRAGMA foreign_key_check``
+    runs inside the same transaction before the stamp, so a corrupt
+    copy aborts the whole migration instead of persisting.  The pragma
+    is a connection-level no-op inside a transaction, hence the
+    off/transaction/on bracket.
+    """
+    legacy_child_id = await _table_has_column(
+        database, "quest_definitions", "child_id"
+    )
+    await database.execute("PRAGMA foreign_keys = OFF")
+    try:
+        async with database.transaction():
+            await database.execute(_ASSIGNEES_TABLE_DDL)
+            if legacy_child_id:
+                await database.execute(
+                    "CREATE TABLE quest_definitions_rebuilt "
+                    f"{QUEST_DEFINITIONS_TABLE_SQL}"
+                )
+                await database.execute(
+                    "INSERT INTO quest_definitions_rebuilt "
+                    "(id, title, description, icon, schedule_rule_id, "
+                    "due_time, is_active, created_at) "
+                    "SELECT id, title, description, icon, "
+                    "schedule_rule_id, due_time, is_active, created_at "
+                    "FROM quest_definitions ORDER BY id"
+                )
+                await database.execute(
+                    "INSERT OR IGNORE INTO quest_definition_assignees "
+                    "(definition_id, child_id) "
+                    "SELECT id, child_id FROM quest_definitions"
+                )
+                await database.execute("DROP TABLE quest_definitions")
+                await database.execute(
+                    "ALTER TABLE quest_definitions_rebuilt "
+                    "RENAME TO quest_definitions"
+                )
+                violations = await database.fetch_all(
+                    "PRAGMA foreign_key_check"
+                )
+                if violations:
+                    raise RuntimeError(
+                        "definition rebuild produced foreign-key "
+                        f"violations: {violations!r}"
+                    )
+            await stamp_schema_version(database, target_version)
+    finally:
+        await database.execute("PRAGMA foreign_keys = ON")
+
+
+async def _widen_instance_key(
+    database: NestQuestDatabase, target_version: int
+) -> None:
+    """Bring ``quest_instances`` to the D-008 instance key.
+
+    Databases whose instance table still carries the pre-window shape
+    (no ``window`` column, UNIQUE on (definition_id, due_date)) are
+    rebuilt via SQLite's canonical procedure into the widened shape —
+    UNIQUE (definition_id, child_id, due_date, window) — with every
+    migrated row landing in :data:`LEGACY_MIGRATED_WINDOW` so existing
+    ids (and the completion events referencing them) survive intact.
+    The old rows were unique per (definition, due_date), so pinning one
+    window cannot collide with the widened key.  Fresh databases whose
+    table already matches the canonical shape only stamp.
+
+    The rebuild runs with ``foreign_keys = OFF`` (dropping the old
+    table under enforcement would fire the implicit DELETE and violate
+    the ``completion_events`` foreign key) and verifies
+    ``PRAGMA foreign_key_check`` inside the transaction before the
+    stamp, so a corrupt copy aborts the whole migration.
+    """
+    legacy_shape = not await _table_has_column(
+        database, "quest_instances", "window"
+    )
+    await database.execute("PRAGMA foreign_keys = OFF")
+    try:
+        async with database.transaction():
+            if legacy_shape:
+                await database.execute(
+                    "CREATE TABLE quest_instances_rebuilt "
+                    f"{QUEST_INSTANCES_TABLE_SQL}"
+                )
+                await database.execute(
+                    "INSERT INTO quest_instances_rebuilt "
+                    "(id, definition_id, child_id, window, due_date, "
+                    "due_time, generated_at) "
+                    "SELECT id, definition_id, child_id, ?, due_date, "
+                    "due_time, generated_at "
+                    "FROM quest_instances ORDER BY id",
+                    (LEGACY_MIGRATED_WINDOW,),
+                )
+                await database.execute("DROP TABLE quest_instances")
+                await database.execute(
+                    "ALTER TABLE quest_instances_rebuilt "
+                    "RENAME TO quest_instances"
+                )
+                violations = await database.fetch_all(
+                    "PRAGMA foreign_key_check"
+                )
+                if violations:
+                    raise RuntimeError(
+                        "instance rebuild produced foreign-key "
+                        f"violations: {violations!r}"
+                    )
+                LOGGER.info(
+                    "Widened quest_instances key; migrated rows pinned "
+                    "to the %r window",
+                    LEGACY_MIGRATED_WINDOW,
+                )
+            await stamp_schema_version(database, target_version)
+    finally:
+        await database.execute("PRAGMA foreign_keys = ON")
+
+
+async def _add_actor_child_id(
+    database: NestQuestDatabase, target_version: int
+) -> None:
+    """Bring ``completion_events`` to the D-008 actor-child shape.
+
+    The ``actor_child_id`` column records which panel profile was
+    tapped; it cannot be added with ``ALTER TABLE ADD COLUMN`` alone
+    because the canonical shape also carries an actor-pair coherence
+    CHECK (panel events require it, user events forbid it), and CHECK
+    constraints cannot be added to an existing table.  Databases with
+    the legacy shape are therefore rebuilt via SQLite's canonical
+    procedure, backfilling each legacy panel row's ``actor_child_id``
+    to ``child_id`` — pre-D-008 panel completions were always recorded
+    against the tapped child themselves — while admin rows stay NULL.
+    Row ids are preserved so ``quest_instances`` references and the
+    append-only history stay intact.  Fresh databases already match
+    the canonical shape and only stamp.
+
+    The rebuild runs with ``foreign_keys = OFF`` and verifies
+    ``PRAGMA foreign_key_check`` inside the transaction before the
+    stamp.  The copy is an INSERT..SELECT, not an UPDATE: the
+    completion_events table keeps its append-only guarantee.
+    """
+    legacy_shape = not await _table_has_column(
+        database, "completion_events", "actor_child_id"
+    )
+    await database.execute("PRAGMA foreign_keys = OFF")
+    try:
+        async with database.transaction():
+            if legacy_shape:
+                await database.execute(
+                    "CREATE TABLE completion_events_rebuilt "
+                    f"{COMPLETION_EVENTS_TABLE_SQL}"
+                )
+                await database.execute(
+                    "INSERT INTO completion_events_rebuilt "
+                    "(id, instance_id, child_id, event_type, actor_source, "
+                    "actor_user_id, actor_child_id, occurred_at, "
+                    "was_on_time) "
+                    "SELECT id, instance_id, child_id, event_type, "
+                    "actor_source, actor_user_id, "
+                    "CASE WHEN actor_source = 'panel' THEN child_id "
+                    "ELSE NULL END, "
+                    "occurred_at, was_on_time "
+                    "FROM completion_events ORDER BY id"
+                )
+                await database.execute("DROP TABLE completion_events")
+                await database.execute(
+                    "ALTER TABLE completion_events_rebuilt "
+                    "RENAME TO completion_events"
+                )
+                violations = await database.fetch_all(
+                    "PRAGMA foreign_key_check"
+                )
+                if violations:
+                    raise RuntimeError(
+                        "completion_events rebuild produced foreign-key "
+                        f"violations: {violations!r}"
+                    )
+                LOGGER.info(
+                    "Added actor_child_id to completion_events; legacy "
+                    "panel rows backfilled to their own child_id"
+                )
+            await stamp_schema_version(database, target_version)
+    finally:
+        await database.execute("PRAGMA foreign_keys = ON")
 
 
 #: The ordered migration list.  Append-only: never edit an applied
@@ -136,6 +402,18 @@ async def _rename_legacy_task_tables(database: NestQuestDatabase) -> None:
 MIGRATIONS: Sequence[MigrationStep] = [
     MIGRATION_1_V1_DDL,
     _rename_legacy_task_tables,
+    _add_definition_assignees,
+    # Migration 4 (D-008): the windows table is a plain new table — a
+    # CREATE IF NOT EXISTS suffices for both fresh databases (which
+    # already made it in migration 1) and pre-window databases.
+    list(SCHEMA_V1_QUEST_DEFINITION_WINDOWS_DDL),
+    # Migration 5 (D-008): rebuild quest_instances onto the widened
+    # (definition_id, child_id, due_date, window) key.
+    _widen_instance_key,
+    # Migration 6 (D-008): rebuild completion_events with the
+    # actor_child_id column and its actor-pair coherence CHECK,
+    # backfilling legacy panel rows to their own child_id.
+    _add_actor_child_id,
 ]
 
 
@@ -248,17 +526,18 @@ async def apply_migrations(
 
         for target in range(current + 1, latest + 1):
             applied = False
-            async with database.transaction():
-                # Re-read the version INSIDE the write transaction: the
-                # outer read was advisory, and the wrapper serializes
-                # individual statements, not the read-decide-apply
-                # decision.  Under the transaction's lock the version
-                # cannot change between the read and the stamp, and the
-                # loser of an interleaved race (a queued second caller
-                # re-running apply_migrations after the winner already
-                # migrated) re-reads here, sees the winner's stamp, and
-                # skips instead of re-applying a non-idempotent
-                # migration with a stale version.
+            step = migrations[target - 1]
+            if callable(step):
+                # Callable migrations own their transaction: some steps
+                # (table rebuilds) must run connection pragmas such as
+                # ``foreign_keys = OFF`` BEFORE opening one, which the
+                # runner's uniform transaction cannot express, and they
+                # stamp inside their own transaction so a failure rolls
+                # the statements and the version stamp back together.
+                # The version is re-read here under the migration lock:
+                # runners on one connection are serialized by it, so
+                # the version cannot change between this read and the
+                # callable's commit.
                 in_tx_version = await read_schema_version(database)
                 if in_tx_version > latest:
                     raise RuntimeError(
@@ -267,41 +546,39 @@ async def apply_migrations(
                         f"{latest}); downgrades are not supported"
                     )
                 if in_tx_version < target:
-                    step = migrations[target - 1]
-                    if callable(step):
-                        await step(database)
-                        applied_statements = 0
-                    else:
+                    await step(database, target)
+                    applied = True
+            else:
+                async with database.transaction():
+                    # Re-read the version INSIDE the write transaction:
+                    # the outer read was advisory, and the wrapper
+                    # serializes individual statements, not the
+                    # read-decide-apply decision.  Under the
+                    # transaction's lock the version cannot change
+                    # between the read and the stamp, and the loser of
+                    # an interleaved race (a queued second caller
+                    # re-running apply_migrations after the winner
+                    # already migrated) re-reads here, sees the
+                    # winner's stamp, and skips instead of re-applying
+                    # a non-idempotent migration with a stale version.
+                    in_tx_version = await read_schema_version(database)
+                    if in_tx_version > latest:
+                        raise RuntimeError(
+                            f"Database schema version {in_tx_version} is "
+                            f"newer than this integration understands "
+                            f"(latest known: {latest}); downgrades are "
+                            f"not supported"
+                        )
+                    if in_tx_version < target:
                         for sql in step:
                             await database.execute(sql)
+                        await stamp_schema_version(database, target)
+                        applied = True
                         applied_statements = len(step)
-                    # INSERT keyed on the singleton row (id = 1): a
-                    # fresh file has no row yet, and migration 1 is the
-                    # only migration a version-0 database can run, so
-                    # the row is seeded by the same statement batch
-                    # when needed.  UPDATE alone would silently match
-                    # zero rows there.
-                    await database.execute(
-                        f"INSERT INTO {VERSION_TABLE} (id, version) "
-                        "VALUES (1, ?) "
-                        "ON CONFLICT (id) DO UPDATE SET version = "
-                        "excluded.version",
-                        (target,),
-                    )
-                    applied = True
             if applied:
-                if applied_statements == 0:
-                    LOGGER.info(
-                        "NestQuest schema migrated to version %d",
-                        target,
-                    )
-                else:
-                    LOGGER.info(
-                        "NestQuest schema migrated to version %d "
-                        "(%d statement%s)",
-                        target,
-                        applied_statements,
-                        "s" if applied_statements != 1 else "",
-                    )
+                LOGGER.info(
+                    "NestQuest schema migrated to version %d",
+                    target,
+                )
 
         return latest

custom_components/nestquest/options_flow.py

@@ -7,15 +7,19 @@ from typing import Any
 import voluptuous as vol
 from homeassistant import config_entries
 from homeassistant.data_entry_flow import FlowResult
+from homeassistant.helpers import config_validation as cv
 
 from .const import (
+    CONF_ADMIN_USER_IDS,
     CONF_DAY_ROLLOVER_TIME,
     CONF_HORIZON_DAYS,
     CONF_PANEL_IDLE_TIMEOUT,
     DEFAULT_DAY_ROLLOVER_TIME,
     DEFAULT_HORIZON_DAYS,
     DEFAULT_PANEL_IDLE_TIMEOUT,
+    DOMAIN,
 )
+from .admin_allowlist import list_admin_ids, set_admin_ids
 
 MIN_HORIZON_DAYS = 1
 MIN_PANEL_IDLE_TIMEOUT = 30
@@ -55,51 +59,168 @@ def _async_validate(user_input: dict[str, Any]) -> dict[str, str]:
     return errors
 
 
-def _build_schema(current: dict[str, Any]) -> vol.Schema:
-    """Build the form schema, pre-filled with the current values."""
-    return vol.Schema(
-        {
-            vol.Required(
-                CONF_HORIZON_DAYS, default=current[CONF_HORIZON_DAYS]
-            ): int,
-            vol.Required(
-                CONF_DAY_ROLLOVER_TIME, default=current[CONF_DAY_ROLLOVER_TIME]
-            ): str,
-            vol.Required(
-                CONF_PANEL_IDLE_TIMEOUT, default=current[CONF_PANEL_IDLE_TIMEOUT]
-            ): int,
-        }
-    )
+def _build_schema(
+    current: dict[str, Any],
+    *,
+    admin_choices: dict[str, str] | None = None,
+    admin_default: list[str] | None = None,
+) -> vol.Schema:
+    """Build the form schema, pre-filled with the current values.
+
+    The admin picker is a multi-select of EXISTING Home Assistant users
+    (never a free-text field — the allowlist stores user IDs); its
+    default is the current database allowlist, so an untouched submit
+    re-saves exactly who is already allowed.
+    """
+    fields: dict[Any, Any] = {
+        vol.Required(
+            CONF_HORIZON_DAYS, default=current[CONF_HORIZON_DAYS]
+        ): int,
+        vol.Required(
+            CONF_DAY_ROLLOVER_TIME, default=current[CONF_DAY_ROLLOVER_TIME]
+        ): str,
+        vol.Required(
+            CONF_PANEL_IDLE_TIMEOUT, default=current[CONF_PANEL_IDLE_TIMEOUT]
+        ): int,
+    }
+    if admin_choices is not None:
+        # HA's supported multi-select validator: the frontend can
+        # serialize the field as a real picker of the given choices.
+        fields[
+            vol.Optional(
+                CONF_ADMIN_USER_IDS, default=list(admin_default or [])
+            )
+        ] = cv.multi_select(admin_choices)
+    return vol.Schema(fields)
 
 
 class NestQuestOptionsFlow(config_entries.OptionsFlowWithConfigEntry):
     """Handle the options flow for NestQuest."""
 
+    def _async_database(self):
+        """Return the runtime database for this entry, or None.
+
+        Real HA only opens the options flow for an existing entry, so
+        the runtime record (and its database) exists; the None branch
+        covers direct construction in tests and degraded states.
+        """
+        hass_data = getattr(self.hass, "data", None)
+        if not isinstance(hass_data, dict):
+            return None
+        record = hass_data.get(DOMAIN, {}).get(self.config_entry.entry_id)
+        database = getattr(record, "database", None)
+        return database if getattr(database, "connected", False) else None
+
+    async def _async_admin_choices(self) -> dict[str, str]:
+        """Map HA user id -> display name for the picker.
+
+        Real Home Assistant always provides ``hass.auth``; a missing
+        one (direct construction in tests, degraded harness) degrades
+        to an empty picker rather than crashing the form.
+        """
+        auth = getattr(self.hass, "auth", None)
+        if auth is None:
+            return {}
+        users = await auth.async_get_users()
+        return {
+            user.id: user.name
+            for user in users
+            if getattr(user, "id", None)
+        }
+
+    async def _async_current_admin_ids(self) -> list[str]:
+        """Return the current allowlist, or [] without a database."""
+        database = self._async_database()
+        if database is None:
+            return []
+        return await list_admin_ids(database)
+
     async def async_step_init(
         self, user_input: dict[str, Any] | None = None
     ) -> FlowResult:
         """Manage the NestQuest options."""
+        admin_choices = await self._async_admin_choices()
+        admin_default = await self._async_current_admin_ids()
         if user_input is None:
             return self.async_show_form(
-                step_id="init", data_schema=_build_schema(self._current_values())
+                step_id="init",
+                data_schema=_build_schema(
+                    self._current_values(),
+                    admin_choices=admin_choices,
+                    admin_default=admin_default,
+                ),
             )
 
         errors = _async_validate(user_input)
+        # The admin ids are validated only when the key is present:
+        # schema-validated submits always carry it (vol.Optional's
+        # default fills from the current allowlist), while raw callers
+        # omitting the key keep the field untouched.
+        admin_ids_present = CONF_ADMIN_USER_IDS in user_input
+        admin_ids = user_input.get(CONF_ADMIN_USER_IDS)
         if errors:
             return self.async_show_form(
                 step_id="init",
-                data_schema=_build_schema(self._current_values()),
+                data_schema=_build_schema(
+                    self._current_values(),
+                    admin_choices=admin_choices,
+                    admin_default=admin_default,
+                ),
+                errors=errors,
+            )
+        if admin_ids_present and (
+            not isinstance(admin_ids, list)
+            or any(not isinstance(value, str) for value in admin_ids)
+        ):
+            errors[CONF_ADMIN_USER_IDS] = "invalid_admin"
+        elif admin_ids_present and not admin_ids:
+            # An empty allowlist fails closed: saving zero admins is
+            # refused, never silently applied.
+            errors[CONF_ADMIN_USER_IDS] = "no_admins"
+        elif admin_ids_present and any(
+            value not in admin_choices for value in admin_ids
+        ):
+            # The schema enforces membership for real HA submits; this
+            # backs the raw-input path up so an unknown id can never
+            # reach the allowlist.
+            errors[CONF_ADMIN_USER_IDS] = "invalid_admin"
+        elif admin_ids_present and len(set(admin_ids)) != len(admin_ids):
+            # set_admin_ids refuses duplicates with ValueError; a flow
+            # submission must surface that as a field error instead of
+            # an unhandled crash.
+            errors[CONF_ADMIN_USER_IDS] = "invalid_admin"
+        if errors:
+            return self.async_show_form(
+                step_id="init",
+                data_schema=_build_schema(
+                    self._current_values(),
+                    admin_choices=admin_choices,
+                    admin_default=admin_default,
+                ),
                 errors=errors,
             )
 
-        return self.async_create_entry(
-            title="NestQuest",
-            data={
-                CONF_HORIZON_DAYS: user_input[CONF_HORIZON_DAYS],
-                CONF_DAY_ROLLOVER_TIME: user_input[CONF_DAY_ROLLOVER_TIME],
-                CONF_PANEL_IDLE_TIMEOUT: user_input[CONF_PANEL_IDLE_TIMEOUT],
-            },
-        )
+        # Apply the picker's selection to the allowlist when the
+        # runtime database is reachable; the selection is always
+        # stored on the entry as the disaster-recovery copy.
+        database = self._async_database()
+        if database is not None and admin_ids_present:
+            await set_admin_ids(database, admin_ids)
+        data = {
+            CONF_HORIZON_DAYS: user_input[CONF_HORIZON_DAYS],
+            CONF_DAY_ROLLOVER_TIME: user_input[CONF_DAY_ROLLOVER_TIME],
+            CONF_PANEL_IDLE_TIMEOUT: user_input[CONF_PANEL_IDLE_TIMEOUT],
+        }
+        if admin_ids_present:
+            data[CONF_ADMIN_USER_IDS] = admin_ids
+        elif admin_default:
+            # HA replaces entry.options wholesale, so an omitted picker
+            # field must carry the CURRENT allowlist forward: dropping
+            # it would leave only the stale config-flow copy in entry
+            # data, and a later database loss would resurrect admins
+            # the owner has since removed.
+            data[CONF_ADMIN_USER_IDS] = list(admin_default)
+        return self.async_create_entry(title="NestQuest", data=data)
 
     def _current_values(self) -> dict[str, Any]:
         """Resolve current values from entry options, then entry data, then defaults."""

custom_components/nestquest/presence.py

@@ -0,0 +1,477 @@
+"""The presence and custody model (Feature 05).
+
+PURE module: no Home Assistant imports, no database access, no
+timezone logic — it operates on plain calendar dates only (feature
+guardrail).  The later engine (cycle position, ``is_present``,
+overrides, previews) builds directly on this model.
+
+A :class:`PresenceSchedule` answers "on which weekdays of which cycle
+week is this child at this house?" for an N-week repeating custody
+pattern.  Two of the household's three children follow a two-week
+rotation; a child with NO schedule row is present every day (that
+default lives in the engine, not here).
+
+Pattern encoding: the model's canonical serialization is the SAME
+pipe-separated CSV the database stores (see schema.py's
+``presence_schedules.pattern``): segment ``i`` (week index ``i``) is a
+comma-separated list of present weekdays, 0 = Monday .. 6 = Sunday,
+e.g. ``'0,2,4|1,3'`` = Mon/Wed/Fri in week 0, Tue/Thu in week 1.  An
+empty segment means absent every day of that week.  Encoding sorts
+each segment's weekdays and uses the exact segment order, so
+``decode(encode(schedule))`` round-trips losslessly and two schedules
+with equal patterns produce equal strings.
+
+Anchor-date policy: ``anchor_date`` pins the cycle.  Cycle position is
+computed from anchor-date arithmetic ONLY — never ISO week numbers or
+week parity (D-004): 53-week years silently invert parity on January
+1st.  The arithmetic lives in the engine task; this module validates
+that the anchor is a strict calendar date.
+
+Validation policy: construction is total — every reject happens in
+``__init__`` so no invalid schedule can ever exist:
+- ``cycle_length_weeks`` must be an integer 1..4.  The 4 cap matches
+  the database CHECK (schema.py) and keeps anchor arithmetic and the
+  encoded pattern human-readable; revisit both together if a longer
+  cycle is ever needed.
+- ``pattern`` must cover week indices 0..cycle_length_weeks-1 exactly
+  (no gaps, no extra weeks) with sets of integers 0..6 (bools
+  rejected: True would silently mean Monday).
+- ``anchor_date`` must be a strict ISO YYYY-MM-DD calendar date (or a
+  ``datetime.date``).
+"""
+from __future__ import annotations
+
+import datetime
+from dataclasses import dataclass
+from types import MappingProxyType
+
+#: The schema's documented cap for cycle_length_weeks (schema.py keeps
+#: the pattern human-readable and the anchor arithmetic small).
+MAX_CYCLE_LENGTH_WEEKS = 4
+
+_DATE_FORMAT = "%Y-%m-%d"
+
+
+def _parse_date(value: object, field_name: str) -> datetime.date:
+    """Accept a datetime.date or a strict YYYY-MM-DD string.
+
+    ``datetime.datetime`` is rejected explicitly: it SUBCLASSES
+    datetime.date, so a bare isinstance check would store a value with
+    a time component and every later calendar-date comparison (e.g.
+    ``PresenceOverride.covers``) would raise TypeError.
+    """
+    if isinstance(value, datetime.datetime):
+        raise ValueError(
+            f"{field_name} must be a plain calendar date, not a "
+            f"datetime with a time component: {value!r}"
+        )
+    if isinstance(value, datetime.date):
+        return value
+    if not isinstance(value, str):
+        raise ValueError(
+            f"{field_name} must be a datetime.date or an ISO date string, "
+            f"got {value!r}"
+        )
+    try:
+        parsed = datetime.datetime.strptime(value, _DATE_FORMAT).date()
+    except (TypeError, ValueError):
+        raise ValueError(
+            f"{field_name} must be an ISO date (YYYY-MM-DD), got {value!r}"
+        ) from None
+    if parsed.isoformat() != value:
+        raise ValueError(
+            f"{field_name} must be a strict YYYY-MM-DD date, got {value!r}"
+        )
+    return parsed
+
+
+def _validate_week_index(week: object, cycle_length_weeks: int) -> int:
+    """Reject non-int week indices (bools included) and out-of-cycle."""
+    if isinstance(week, bool) or not isinstance(week, int):
+        raise ValueError(
+            f"pattern week index must be an integer, got {week!r}"
+        )
+    if not 0 <= week < cycle_length_weeks:
+        raise ValueError(
+            f"pattern week index must be in 0..{cycle_length_weeks - 1}, "
+            f"got {week}"
+        )
+    return week
+
+
+def _validate_weekday_set(week: int, weekdays: object) -> frozenset[int]:
+    """Validate one week's present-weekday set."""
+    if isinstance(weekdays, (str, bytes)) or weekdays is None:
+        raise ValueError(
+            f"pattern[{week}] must be an iterable of weekday ints 0..6, "
+            f"got {weekdays!r}"
+        )
+    try:
+        members = list(weekdays)
+    except TypeError:
+        raise ValueError(
+            f"pattern[{week}] must be an iterable of weekday ints 0..6, "
+            f"got {weekdays!r}"
+        ) from None
+    for member in members:
+        if isinstance(member, bool) or not isinstance(member, int):
+            raise ValueError(
+                f"pattern[{week}] weekday must be an int 0..6, got {member!r}"
+            )
+        if not 0 <= member <= 6:
+            raise ValueError(
+                f"pattern[{week}] weekday must be in 0..6 (Monday=0), "
+                f"got {member}"
+            )
+    return frozenset(members)
+
+
+def _validate_cycle_length(value: object) -> int:
+    """Reject non-int and out-of-range cycle lengths (bools included)."""
+    if isinstance(value, bool) or not isinstance(value, int):
+        raise ValueError(
+            f"cycle_length_weeks must be an integer, got {value!r}"
+        )
+    if not 1 <= value <= MAX_CYCLE_LENGTH_WEEKS:
+        raise ValueError(
+            f"cycle_length_weeks must be between 1 and "
+            f"{MAX_CYCLE_LENGTH_WEEKS}, got {value}"
+        )
+    return value
+
+
+def _validate_child_id(value: object) -> int:
+    """Reject non-int child ids (bools would silently address child 1)."""
+    if isinstance(value, bool) or not isinstance(value, int):
+        raise ValueError(f"child_id must be an integer, got {value!r}")
+    return value
+
+
+@dataclass(frozen=True, init=False)
+class PresenceSchedule:
+    """One child's N-week repeating presence pattern.
+
+    ``pattern`` maps each week index of the cycle (``0`` .. ``n-1``)
+    to the set of present weekdays (ints, Monday=0).  A week with an
+    empty set means the child is absent every day of that week — which
+    is distinct from having no schedule at all (the engine treats a
+    missing schedule as present every day).
+    """
+
+    child_id: int
+    cycle_length_weeks: int
+    anchor_date: datetime.date
+    pattern: MappingProxyType  # week index -> frozenset of weekdays
+
+    def __init__(
+        self,
+        child_id: int,
+        cycle_length_weeks: int,
+        anchor_date: object,
+        pattern: dict[int, object],
+    ) -> None:
+        object.__setattr__(self, "child_id", _validate_child_id(child_id))
+        cycle = _validate_cycle_length(cycle_length_weeks)
+        object.__setattr__(self, "cycle_length_weeks", cycle)
+        object.__setattr__(
+            self, "anchor_date", _parse_date(anchor_date, "anchor_date")
+        )
+        if not isinstance(pattern, dict):
+            raise ValueError(
+                "pattern must map week index to a set of present "
+                f"weekdays, got {pattern!r}"
+            )
+        normalised: dict[int, frozenset[int]] = {}
+        for week, weekdays in pattern.items():
+            index = _validate_week_index(week, cycle)
+            normalised[index] = _validate_weekday_set(index, weekdays)
+        missing = [
+            week for week in range(cycle) if week not in normalised
+        ]
+        if missing:
+            raise ValueError(
+                f"pattern must cover week indices 0..{cycle - 1}; "
+                f"missing {missing}"
+            )
+        # Frozen must mean frozen: a bare dict would let callers inject
+        # unvalidated weekdays (or drop required weeks) AFTER
+        # construction, bypassing total validation.  The mapping
+        # proxy exposes the validated contents read-only; the
+        # per-week sets are already frozensets.
+        object.__setattr__(self, "pattern", MappingProxyType(normalised))
+
+    def encode(self) -> str:
+        """Serialize to the database's pipe-separated CSV shape.
+
+        Segments appear in week order; each segment is the week's
+        present weekdays as a sorted comma-separated list (an empty set
+        encodes as an empty segment).  Two schedules with equal
+        patterns encode identically.
+        """
+        segments = [
+            ",".join(str(day) for day in sorted(self.pattern[week]))
+            for week in range(self.cycle_length_weeks)
+        ]
+        return "|".join(segments)
+
+    @classmethod
+    def decode(
+        cls,
+        child_id: int,
+        anchor_date: object,
+        encoded: str,
+    ) -> "PresenceSchedule":
+        """Build a schedule from its encoded pattern.
+
+        The cycle length is derived from the segment count, mirroring
+        the database's segment-count CHECK.  Decoding is strict: wrong
+        shapes, non-numeric or out-of-range weekdays are rejected —
+        the database CHECKs make such rows unrepresentable, and this
+        is the same contract on the model side.  A segment count above
+        the documented cycle cap is rejected by the ordinary
+        construction validation.
+        """
+        if not isinstance(encoded, str):
+            raise ValueError(
+                f"encoded pattern must be a string, got {encoded!r}"
+            )
+        segments = encoded.split("|")
+        pattern: dict[int, set[int]] = {}
+        for week, segment in enumerate(segments):
+            weekdays: set[int] = set()
+            if segment:
+                for part in segment.split(","):
+                    if len(part) != 1 or part not in "0123456":
+                        raise ValueError(
+                            f"encoded segment {week} carries an invalid "
+                            f"weekday {part!r} (single digits 0-6 only)"
+                        )
+                    weekdays.add(int(part))
+            pattern[week] = weekdays
+        return cls(child_id, len(segments), anchor_date, pattern)
+
+
+@dataclass(frozen=True, init=False)
+class PresenceOverride:
+    """A date-specific present/absent flag beating any pattern.
+
+    Covers a single date (``end_date == start_date``) or an inclusive
+    range.  A concrete range is the storage shape
+    (``presence_overrides.end_date`` is NOT NULL), so the model
+    requires both bounds and validates start <= end.  Construction and
+    validation live here so the engine can trust every instance.
+    """
+
+    child_id: int
+    start_date: datetime.date
+    end_date: datetime.date
+    is_present: bool
+    note: str | None
+
+    def __init__(
+        self,
+        child_id: int,
+        start_date: object,
+        end_date: object,
+        is_present: bool,
+        note: str | None = None,
+    ) -> None:
+        object.__setattr__(self, "child_id", _validate_child_id(child_id))
+        start = _parse_date(start_date, "start_date")
+        end = _parse_date(end_date, "end_date")
+        if end < start:
+            raise ValueError(
+                f"end_date must be on or after start_date, got "
+                f"{end.isoformat()} < {start.isoformat()}"
+            )
+        object.__setattr__(self, "start_date", start)
+        object.__setattr__(self, "end_date", end)
+        if not isinstance(is_present, bool):
+            raise ValueError(
+                f"is_present must be a real bool, got {is_present!r}"
+            )
+        object.__setattr__(self, "is_present", is_present)
+        if note is not None and not isinstance(note, str):
+            raise ValueError(f"note must be a string or None, got {note!r}")
+        object.__setattr__(self, "note", note)
+
+    def covers(self, date: datetime.date) -> bool:
+        """Return True when the override applies to ``date``."""
+        return self.start_date <= date <= self.end_date
+
+
+def cycle_week_index(
+    schedule: PresenceSchedule, target_date: object
+) -> int:
+    """Return the cycle week index ``target_date`` falls in.
+
+    Anchor-date arithmetic ONLY (D-004): ``((target_date -
+    anchor_date).days // 7) % cycle_length_weeks``.  Python's floor
+    division makes dates BEFORE the anchor behave correctly — they
+    walk the cycle backwards (day -1 is the last week of the cycle,
+    day -8 wraps one further) instead of inverting, which is exactly
+    what ISO week parity does wrong in 53-week years.  The modulo of
+    a negative in Python is non-negative, so the index is always a
+    valid week index.
+    """
+    target = _parse_date(target_date, "target_date")
+    days = (target - schedule.anchor_date).days
+    return (days // 7) % schedule.cycle_length_weeks
+
+
+#: Search cap for :meth:`PresenceEngine.next_present_dates`: two full
+#: years of daily checks.  A child absent every day (an all-absent
+#: pattern with a blocking override) would otherwise loop forever; the
+#: cap bounds the scan and surfaces the situation as an error instead.
+MAX_PREVIEW_SCAN_DAYS = 366 * 2
+
+
+class PresenceEngine:
+    """Answers "is this child at this house on this date?".
+
+    Pure and side-effect-free: built from an immutable snapshot of the
+    children's schedules (``child_id -> PresenceSchedule``), it never
+    touches the database — callers build a snapshot from the DAO layer
+    and pass it in.  A child with NO schedule entry is present every
+    day (the third household child's case); a child WITH a schedule is
+    present exactly when the date's weekday is in that schedule's
+    pattern for the date's cycle week index (anchor-date arithmetic —
+    :func:`cycle_week_index`, never ISO week parity).
+    """
+
+    def __init__(
+        self,
+        schedules: dict[int, PresenceSchedule],
+        overrides: dict[int, list[PresenceOverride]] | None = None,
+    ) -> None:
+        if not isinstance(schedules, dict):
+            raise ValueError(
+                f"schedules must map child_id to PresenceSchedule, got "
+                f"{schedules!r}"
+            )
+        for child_id, schedule in schedules.items():
+            # Validate the KEY as a model child id too: True and 1.0
+            # compare equal to 1, so {True: schedule(1)} would be
+            # accepted and then behave differently on lookup.
+            _validate_child_id(child_id)
+            if not isinstance(schedule, PresenceSchedule):
+                raise ValueError(
+                    f"schedules[{child_id!r}] must be a PresenceSchedule, "
+                    f"got {schedule!r}"
+                )
+            if schedule.child_id != child_id:
+                raise ValueError(
+                    f"schedules is keyed {child_id!r} but holds the "
+                    f"schedule of child {schedule.child_id}"
+                )
+        if overrides is None:
+            overrides = {}
+        if not isinstance(overrides, dict):
+            raise ValueError(
+                "overrides must map child_id to a list of "
+                f"PresenceOverride, got {overrides!r}"
+            )
+        for child_id, entries in overrides.items():
+            _validate_child_id(child_id)
+            if not isinstance(entries, list):
+                raise ValueError(
+                    f"overrides[{child_id!r}] must be a list of "
+                    f"PresenceOverride, got {entries!r}"
+                )
+            for entry in entries:
+                if not isinstance(entry, PresenceOverride):
+                    raise ValueError(
+                        f"overrides[{child_id!r}] entries must be "
+                        f"PresenceOverride, got {entry!r}"
+                    )
+                if entry.child_id != child_id:
+                    raise ValueError(
+                        f"overrides is keyed {child_id!r} but holds an "
+                        f"override of child {entry.child_id}"
+                    )
+        # Read-only snapshot: reassignment is refused and no mutator
+        # exists, so a built engine answers consistently for its
+        # lifetime.  The overrides lists are copied to immutable
+        # tuples — a shallow mapping copy alone would leave caller-
+        # owned lists reachable through _overrides, and mutating one
+        # later would change is_present results.
+        object.__setattr__(self, "_schedules", MappingProxyType(dict(schedules)))
+        object.__setattr__(
+            self,
+            "_overrides",
+            MappingProxyType(
+                {child_id: tuple(entries) for child_id, entries in overrides.items()}
+            ),
+        )
+
+    def is_present(self, child_id: object, date: object) -> bool:
+        """Return whether ``child_id`` is present on ``date``.
+
+        Overrides take precedence over the repeating pattern: when an
+        override covers the date, its flag IS the answer — including
+        for a child with no schedule at all.  The DAO layer guarantees
+        a child's overrides never overlap; if a snapshot still carries
+        two covering the same date, the one with the LATEST start date
+        wins (deterministic, and matches "the most specific swap wins").
+        """
+        if isinstance(child_id, bool) or not isinstance(child_id, int):
+            raise ValueError(f"child_id must be an integer, got {child_id!r}")
+        target = _parse_date(date, "date")
+        entries = self._overrides.get(child_id) or []
+        covering = [
+            entry for entry in entries if entry.covers(target)
+        ]
+        if covering:
+            winner = max(covering, key=lambda entry: entry.start_date)
+            return winner.is_present
+        schedule = self._schedules.get(child_id)
+        if schedule is None:
+            # No schedule at all: present every day (household default).
+            return True
+        week = cycle_week_index(schedule, target)
+        return target.weekday() in schedule.pattern[week]
+
+    def next_present_dates(
+        self,
+        child_id: object,
+        start_date: object,
+        count: int,
+    ) -> list[datetime.date]:
+        """Return the next ``count`` dates the child is present.
+
+        Walks forward from ``start_date`` (INCLUSIVE — a parent
+        previewing "starting Monday" expects Monday itself when the
+        child is present) checking :meth:`is_present` for every day,
+        so overrides and the pattern are honoured identically.  The
+        admin Schedule tab renders this preview so a parent can confirm
+        a custody pattern is right before saving it.
+
+        A child absent every scanned day raises ValueError after the
+        two-year search cap — an always-absent child would otherwise
+        loop forever.  ``count`` must be a positive integer.
+        """
+        _validate_child_id(child_id)
+        start = _parse_date(start_date, "start_date")
+        if isinstance(count, bool) or not isinstance(count, int):
+            raise ValueError(f"count must be an integer, got {count!r}")
+        if count < 1:
+            raise ValueError(f"count must be at least 1, got {count}")
+        found: list[datetime.date] = []
+        day = start
+        for _ in range(MAX_PREVIEW_SCAN_DAYS):
+            if self.is_present(child_id, day):
+                found.append(day)
+                if len(found) == count:
+                    return found
+            day += datetime.timedelta(days=1)
+        raise ValueError(
+            f"child {child_id} is not present on any of the "
+            f"{MAX_PREVIEW_SCAN_DAYS} days from {start.isoformat()}; "
+            f"{count} present day(s) cannot be previewed"
+        )
+
+    def __setattr__(self, name: object, value: object) -> None:
+        raise AttributeError(
+            "PresenceEngine is an immutable snapshot; build a new engine "
+            "instead of mutating this one"
+        )

custom_components/nestquest/quest_definitions.py

@@ -0,0 +1,603 @@
+"""Business layer for creating and editing quest definitions (Feature 06).
+
+Sits between the Feature 09 service gate and the typed
+:class:`~.dao_rules.QuestDefinitionsDao`: callers get validation and the
+all-or-nothing create/edit here, and never touch the DAO SQL directly.
+:func:`create_quest_definition` is the create path,
+:func:`edit_quest_definition` the edit path, :func:`assign_child` and
+:func:`unassign_child` the assignment paths, and
+:func:`set_quest_definition_active` the deactivate/reactivate path.
+There is no permission check here (that is Feature 09).
+
+Validation policy mirrors :mod:`.children`:
+
+- ``title`` is required and trimmed; empty or whitespace-only raises
+  ValueError.
+- ``rule`` must be an already-validated :class:`~.recurrence.ScheduleRule`
+  (its constructor is total — rule validation is NOT re-implemented
+  here).
+- ``assignee_child_ids`` must be a non-empty list (strictly a ``list``);
+  every id is a plain int (bools and floats rejected, since SQLite would
+  bind them onto a real child) and must reference an existing ACTIVE
+  child (the DAO enforces the active/exists check inside the same
+  transaction).  Duplicate ids are rejected here, before the composite
+  primary key could surface them as an :class:`sqlite3.IntegrityError`.
+- ``windows`` must be a non-empty list (strictly a ``list``); each entry
+  is a window name from :data:`~.const.QUEST_WINDOWS` — either a bare
+  name (no due time) or a ``(name, due_time)`` pair whose due time is a
+  strict 24-hour HH:MM string.  Duplicate window names are rejected
+  here, before the composite primary key could surface them as an
+  :class:`sqlite3.IntegrityError`.
+
+The rule, definition, assignees and windows are persisted in ONE
+transaction (the DAO's :meth:`~.dao_rules.QuestDefinitionsDao.create_with_rule_and_windows`),
+so a rejected or failed create persists nothing.  The definition-level
+``due_time`` column is superseded by per-window due times (D-008) and is
+never set here.  ``created_at`` is stamped UTC ISO-8601 at second
+precision, matching :mod:`.children`.
+"""
+from __future__ import annotations
+
+import datetime
+from dataclasses import dataclass
+
+from .dao_children import ChildRecord, _connection_lock
+from .dao_rules import (
+    QuestDefinitionRecord,
+    QuestDefinitionSnapshot,
+    QuestDefinitionWindowRecord,
+    QuestDefinitionsDao,
+    ScheduleRuleStorage,
+    ScheduleRulesDao,
+    _UNSET,
+    _validate_date,
+    _validate_time,
+    _validate_window,
+    schedule_rule_from_storage,
+    schedule_rule_storage_from_record,
+    schedule_rule_to_storage,
+)
+from .db import NestQuestDatabase
+from .materialize import regenerate_for_definition
+from .recurrence import ScheduleRule, occurs_on
+
+
+@dataclass(frozen=True)
+class CreatedQuestDefinition:
+    """The persisted result of a create, edit or activation change.
+
+    ``definition`` is the stored row; ``rule`` is the schedule rule
+    decoded back through the storage mapping; ``assignees`` and
+    ``windows`` are the definition's linked child records and window
+    declarations, read through the DAO.
+    """
+
+    definition: QuestDefinitionRecord
+    rule: ScheduleRule
+    assignees: list[ChildRecord]
+    windows: list[QuestDefinitionWindowRecord]
+
+
+def _now_stamp() -> str:
+    """Return the module's strict UTC second-precision stamp."""
+    return datetime.datetime.now(datetime.timezone.utc).isoformat(
+        timespec="seconds"
+    )
+
+
+def _validate_text(
+    value: object, field: str, *, required: bool = False
+) -> str | None:
+    """Validate a free-text field and return it trimmed.
+
+    ``None`` raises when ``required`` and otherwise returns None.  A
+    non-string value is rejected; an empty result is rejected for
+    required fields.
+    """
+    if value is None:
+        if required:
+            raise ValueError(f"{field} is required")
+        return None
+    if not isinstance(value, str):
+        raise ValueError(f"{field} must be a string, got {value!r}")
+    trimmed = value.strip()
+    if required and not trimmed:
+        raise ValueError(f"{field} is required")
+    return trimmed
+
+
+def _validate_assignee_ids(value: object) -> list[int]:
+    """Return the assignee ids as plain ints, or raise naming the field.
+
+    The argument must be a non-empty list — strictly a ``list``: tuples
+    and other sequences are rejected.  Each entry must be a real int
+    (bools and floats rejected) so SQLite cannot bind ``True`` onto
+    child 1 or a float onto a neighbouring profile.
+    """
+    if type(value) is not list:
+        raise ValueError(
+            f"assignee_child_ids must be a list, got {type(value).__name__}"
+        )
+    if not value:
+        raise ValueError("assignee_child_ids must not be empty")
+    ids: list[int] = []
+    for entry in value:
+        if isinstance(entry, bool) or not isinstance(entry, int):
+            raise ValueError(
+                "assignee_child_ids must contain integer child ids, "
+                f"got {entry!r}"
+            )
+        ids.append(entry)
+    if len(set(ids)) != len(ids):
+        raise ValueError(
+            "assignee_child_ids must not contain duplicate child ids"
+        )
+    return ids
+
+
+def _normalize_windows(
+    value: object,
+) -> list[tuple[str, str | None]]:
+    """Normalize the windows argument to ``(name, due_time)`` pairs.
+
+    The outer argument must be a non-empty list — strictly a ``list``:
+    tuples and other sequences are rejected, while each individual entry
+    may still be a ``(window, due_time)`` tuple.  A bare window name
+    (due time None) is also accepted.  The name must be a
+    :data:`~.const.QUEST_WINDOWS` spelling and a present due time must be
+    a strict 24-hour HH:MM, both validated up front so a malformed
+    window is rejected before any write.
+    """
+    if type(value) is not list:
+        raise ValueError(
+            f"windows must be a list, got {type(value).__name__}"
+        )
+    if not value:
+        raise ValueError("windows must not be empty")
+    normalized: list[tuple[str, str | None]] = []
+    seen: set[str] = set()
+    for index, entry in enumerate(value):
+        if isinstance(entry, str):
+            name: object = entry
+            due_time: object = None
+        elif isinstance(entry, (tuple, list)) and len(entry) == 2:
+            name, due_time = entry[0], entry[1]
+        else:
+            raise ValueError(
+                f"windows[{index}] must be a window name or a "
+                f"(name, due_time) pair, got {entry!r}"
+            )
+        _validate_window(name)
+        if due_time is not None:
+            _validate_time(due_time, "due_time")
+        if name in seen:
+            raise ValueError(
+                f"windows must not contain duplicate window {name!r}"
+            )
+        seen.add(name)
+        normalized.append((name, due_time))
+    return normalized
+
+
+def _validate_definition_id(value: object) -> int:
+    """Reject non-int definition ids (bools included) before any lookup.
+
+    SQLite binds Python bools as integers, so ``True`` would silently
+    address definition 1 and a float would round — malformed service
+    input must never mutate the wrong definition.
+    """
+    if isinstance(value, bool) or not isinstance(value, int):
+        raise ValueError(f"definition_id must be an integer, got {value!r}")
+    return value
+
+
+def _validate_child_id(value: object) -> int:
+    """Reject non-int child ids (bools included) before any lookup.
+
+    SQLite binds Python bools as integers, so ``True`` would silently
+    address child 1 and a float would round — malformed service input
+    must never mutate the wrong profile.
+    """
+    if isinstance(value, bool) or not isinstance(value, int):
+        raise ValueError(f"child_id must be an integer, got {value!r}")
+    return value
+
+
+async def create_quest_definition(
+    database: NestQuestDatabase,
+    title: str,
+    rule: ScheduleRule,
+    assignee_child_ids: list[int],
+    windows: list[str | tuple[str, str | None]],
+    *,
+    description: str | None = None,
+    icon: str | None = None,
+) -> CreatedQuestDefinition:
+    """Create a quest definition (rule + assignees + windows) atomically.
+
+    Validates the arguments up front, then persists the schedule rule,
+    the definition, its assignees and its windows in one transaction via
+    the DAO.  Returns the stored definition together with its decoded
+    rule, assignees and windows — all read back inside that same
+    transaction, so the returned bundle is a consistent creation
+    snapshot.  Raises ValueError on any rejected argument; a rejected or
+    failed create persists nothing.
+    """
+    name = _validate_text(title, "title", required=True)
+    assert name is not None
+    if not isinstance(rule, ScheduleRule):
+        raise ValueError(f"rule must be a ScheduleRule, got {rule!r}")
+    assignee_ids = _validate_assignee_ids(assignee_child_ids)
+    window_specs = _normalize_windows(windows)
+    description_value = _validate_text(description, "description")
+    icon_value = _validate_text(icon, "icon")
+
+    storage = schedule_rule_to_storage(rule)
+    dao = QuestDefinitionsDao(database)
+    try:
+        snapshot = await dao.create_with_rule_and_windows(
+            name,
+            storage,
+            _now_stamp(),
+            assignee_ids,
+            window_specs,
+            description=description_value,
+            icon=icon_value,
+        )
+    except ValueError as error:
+        # The DAO's assignee check names only the child; re-raise so the
+        # public contract names the field the caller actually passed.
+        message = str(error)
+        if message.startswith("child "):
+            raise ValueError(
+                f"assignee_child_ids: {message}"
+            ) from error
+        raise
+    decoded_rule = schedule_rule_from_storage(storage)
+    return CreatedQuestDefinition(
+        definition=snapshot.definition,
+        rule=decoded_rule,
+        assignees=snapshot.assignees,
+        windows=snapshot.windows,
+    )
+
+
+async def edit_quest_definition(
+    database: NestQuestDatabase,
+    definition_id: int,
+    *,
+    title: str | object = _UNSET,
+    description: str | None | object = _UNSET,
+    icon: str | None | object = _UNSET,
+    rule: ScheduleRule | object = _UNSET,
+    windows: list[str | tuple[str, str | None]] | object = _UNSET,
+    today: datetime.date | None = None,
+    horizon_days: int | None = None,
+) -> CreatedQuestDefinition:
+    """Edit a quest definition's metadata, rule and windows atomically.
+
+    Arguments default to the sentinel ``_UNSET`` meaning "leave this
+    field alone".  A provided ``title`` is validated like create's
+    (required and trimmed); ``description`` and ``icon`` are optional
+    and may be cleared by passing ``None`` explicitly.  A provided
+    ``rule`` must be an already-validated :class:`~.recurrence.ScheduleRule`
+    and REPLACES the definition's schedule rule IN PLACE — the existing
+    ``schedule_rules`` row is updated, never orphaned or duplicated.  A
+    provided ``windows`` list REPLACES the whole window set (each entry
+    a ``const.QUEST_WINDOWS`` name, optionally with a strict HH:MM due
+    time), matching create's non-empty contract.  Assignment is NOT
+    settable here.  Raises ValueError when the definition does not
+    exist or any argument is rejected.
+
+    Returns the updated definition together with its decoded rule,
+    assignees and windows — all read back inside the DAO's transaction,
+    so the returned bundle is a consistent edit snapshot.  Edits change
+    future instances only; no ``quest_instances`` or
+    ``completion_events`` row is touched.
+
+    ``today`` optionally pins the caller-resolved HA-local date the
+    regeneration's no-past guard and horizon are anchored to (threaded
+    into :func:`~.materialize.regenerate_for_definition`); it is a plain
+    ``datetime.date`` with no HA import here — the Feature 09 service
+    supplies the hass-derived value.  When omitted, regeneration falls
+    back to the host clock, same as before.  ``horizon_days`` sizes the
+    regeneration's re-materialization window the same way (threaded into
+    :func:`~.materialize.regenerate_for_definition`); it defaults to
+    :data:`~.const.DEFAULT_HORIZON_DAYS` when omitted.
+    """
+    _validate_definition_id(definition_id)
+
+    title_value: str | None | object = _UNSET
+    if title is not _UNSET:
+        name = _validate_text(title, "title", required=True)
+        assert name is not None
+        title_value = name
+
+    description_value: str | None | object = _UNSET
+    if description is not _UNSET:
+        description_value = _validate_text(description, "description")
+
+    icon_value: str | None | object = _UNSET
+    if icon is not _UNSET:
+        icon_value = _validate_text(icon, "icon")
+
+    rule_storage: ScheduleRuleStorage | object = _UNSET
+    if rule is not _UNSET:
+        if not isinstance(rule, ScheduleRule):
+            raise ValueError(f"rule must be a ScheduleRule, got {rule!r}")
+        rule_storage = schedule_rule_to_storage(rule)
+
+    window_specs: list[tuple[str, str | None]] | object = _UNSET
+    if windows is not _UNSET:
+        window_specs = _normalize_windows(windows)
+
+    dao = QuestDefinitionsDao(database)
+    try:
+        snapshot = await dao.edit_definition(
+            definition_id,
+            title=title_value,
+            description=description_value,
+            icon=icon_value,
+            rule=rule_storage,
+            windows=window_specs,
+        )
+    except ValueError as error:
+        # The DAO's missing-definition error names only the id; re-raise
+        # so the public contract names the field the caller passed (matching
+        # assign/unassign/deactivate).
+        message = str(error)
+        if message.startswith("quest definition "):
+            raise ValueError(f"definition_id: {message}") from error
+        raise
+
+    decoded_rule = schedule_rule_from_storage(
+        schedule_rule_storage_from_record(snapshot.rule)
+    )
+
+    await regenerate_for_definition(
+        database, definition_id, today=today, horizon_days=horizon_days
+    )
+
+    return CreatedQuestDefinition(
+        definition=snapshot.definition,
+        rule=decoded_rule,
+        assignees=snapshot.assignees,
+        windows=snapshot.windows,
+    )
+
+
+async def assign_child(
+    database: NestQuestDatabase,
+    definition_id: int,
+    child_id: int,
+    *,
+    today: datetime.date | None = None,
+    horizon_days: int | None = None,
+) -> list[ChildRecord]:
+    """Assign ``child_id`` to the definition (idempotent).
+
+    Validates that both ids are plain ints (bools and floats rejected)
+    and that the child exists and is active — the DAO enforces the
+    active/exists check inside its transaction, and also confirms the
+    definition exists.  Assigning an already-assigned child is a no-op
+    (no duplicate row).  Returns the definition's assignees read back
+    inside the DAO's same transaction, a consistent post-assignment
+    roster (a concurrent assign/unassign cannot race it after the
+    write).  Raises ValueError on any rejected argument.  Only the
+    ``quest_definition_assignees`` link is written; existing instances
+    and completion history are never touched.
+
+    ``today`` optionally pins the caller-resolved HA-local date threaded
+    into the assignment's regeneration (see :func:`edit_quest_definition`).
+    ``horizon_days`` optionally sizes the regeneration's re-materialization
+    window the same way.
+    """
+    _validate_definition_id(definition_id)
+    _validate_child_id(child_id)
+    dao = QuestDefinitionsDao(database)
+    try:
+        assignees = await dao.add_assignee(definition_id, child_id)
+    except ValueError as error:
+        # The DAO names only the child/definition; re-raise so the
+        # public contract names the field the caller actually passed.
+        message = str(error)
+        if message.startswith("child "):
+            raise ValueError(f"child_id: {message}") from error
+        if message.startswith("quest definition "):
+            raise ValueError(f"definition_id: {message}") from error
+        raise
+    await regenerate_for_definition(
+        database, definition_id, today=today, horizon_days=horizon_days
+    )
+    return assignees
+
+
+async def unassign_child(
+    database: NestQuestDatabase,
+    definition_id: int,
+    child_id: int,
+    *,
+    today: datetime.date | None = None,
+    horizon_days: int | None = None,
+) -> bool:
+    """Unassign ``child_id`` from the definition; True when removed.
+
+    Validates both ids are plain ints (bools and floats rejected) and
+    that the definition exists, then removes the (definition, child)
+    link.  Returns True when a row was removed and False when the child
+    was not currently assigned.  Raises ValueError on a rejected
+    argument.  Only the ``quest_definition_assignees`` link is written;
+    existing instances and completion history are never touched.
+
+    ``today`` optionally pins the caller-resolved HA-local date threaded
+    into the unassignment's regeneration (see :func:`edit_quest_definition`).
+    ``horizon_days`` optionally sizes the regeneration's re-materialization
+    window the same way.
+    """
+    _validate_definition_id(definition_id)
+    _validate_child_id(child_id)
+    dao = QuestDefinitionsDao(database)
+    definition = await dao.get(definition_id)
+    if definition is None:
+        raise ValueError(
+            f"definition_id: quest definition {definition_id} does not exist"
+        )
+    removed = await dao.remove_assignee(definition_id, child_id)
+    await regenerate_for_definition(
+        database, definition_id, today=today, horizon_days=horizon_days
+    )
+    return removed
+
+
+async def set_quest_definition_active(
+    database: NestQuestDatabase,
+    definition_id: int,
+    is_active: bool,
+    *,
+    today: datetime.date | None = None,
+    horizon_days: int | None = None,
+) -> CreatedQuestDefinition:
+    """Deactivate or reactivate a definition; returns the updated view.
+
+    Flipping the flag is the only removal path (Feature 06 guardrail):
+    a deactivated definition stops future instance generation but its
+    row, schedule rule, assignees and windows all survive, and existing
+    instances plus completion history are never touched.  Reactivation
+    re-enables future generation; generating or removing instances is
+    Feature 07 and does not happen here.
+
+    ``definition_id`` must be a plain int (bools and floats rejected,
+    since SQLite would bind ``True`` onto definition 1) and
+    ``is_active`` must be a real bool — the DAO's ``int()`` would
+    otherwise silently coerce strings and numerics ("1", 0) into a
+    state the caller never asked for.  Raises ValueError naming the
+    offending field when the id is malformed, ``is_active`` is not a
+    bool, or the definition does not exist.
+
+    Atomicity: the existence check, the UPDATE and the readback of the
+    definition, its rule, assignees and windows all run inside the
+    connection-scoped lock, so the returned bundle is a consistent
+    snapshot that a concurrent mutation cannot race.
+
+    ``today`` optionally pins the caller-resolved HA-local date threaded
+    into the activation change's regeneration (see
+    :func:`edit_quest_definition`).  ``horizon_days`` optionally sizes the
+    regeneration's re-materialization window the same way.
+    """
+    _validate_definition_id(definition_id)
+    if not isinstance(is_active, bool):
+        raise ValueError(f"is_active must be a real bool, got {is_active!r}")
+    async with _connection_lock(database):
+        dao = QuestDefinitionsDao(database)
+        if await dao.get(definition_id) is None:
+            raise ValueError(
+                f"definition_id: quest definition {definition_id} "
+                "does not exist"
+            )
+        await dao.set_active(definition_id, is_active)
+        updated = await dao.get(definition_id)
+        assert updated is not None
+        rule_record = await ScheduleRulesDao(database).get(
+            updated.schedule_rule_id
+        )
+        assert rule_record is not None
+        assignees = await dao.list_assignees(definition_id)
+        windows = await dao.list_windows(definition_id)
+    rule = schedule_rule_from_storage(
+        schedule_rule_storage_from_record(rule_record)
+    )
+    await regenerate_for_definition(
+        database, definition_id, today=today, horizon_days=horizon_days
+    )
+    return CreatedQuestDefinition(
+        definition=updated,
+        rule=rule,
+        assignees=assignees,
+        windows=windows,
+    )
+
+
+def _bundle_snapshot(
+    snapshot: QuestDefinitionSnapshot,
+) -> CreatedQuestDefinition:
+    """Decode a DAO snapshot into the layer's rich view.
+
+    The rule record carried by the snapshot is the one the definition
+    referenced at read time, so decoding it here (rather than re-reading
+    through :class:`~.dao_rules.ScheduleRulesDao`) preserves the
+    coherence the DAO's locked snapshot guarantees: the rule, assignees
+    and windows all come from one atomic read, never three separate ones.
+    """
+    rule = schedule_rule_from_storage(
+        schedule_rule_storage_from_record(snapshot.rule)
+    )
+    return CreatedQuestDefinition(
+        definition=snapshot.definition,
+        rule=rule,
+        assignees=snapshot.assignees,
+        windows=snapshot.windows,
+    )
+
+
+async def list_active_definitions(
+    database: NestQuestDatabase,
+) -> list[CreatedQuestDefinition]:
+    """Return every ACTIVE definition with its decoded rule and links.
+
+    Ordered by rising definition id, matching the DAO's ``list_active``
+    order, so callers get a stable, repeatable sequence.  Each entry is
+    the same rich :class:`CreatedQuestDefinition` snapshot as the rest of
+    the layer: the stored row plus its decoded
+    :class:`~.recurrence.ScheduleRule`, assignees and windows.  The
+    definitions and their links are read by the DAO inside one locked
+    transaction, so each bundle is a coherent snapshot that a concurrent
+    edit cannot interleave.
+    """
+    dao = QuestDefinitionsDao(database)
+    snapshots = await dao.list_snapshots_active()
+    return [_bundle_snapshot(snapshot) for snapshot in snapshots]
+
+
+async def list_definitions_for_child(
+    database: NestQuestDatabase,
+    child_id: int,
+) -> list[CreatedQuestDefinition]:
+    """Return the definitions assigned to ``child_id`` (rich view).
+
+    ``child_id`` must be a plain int (bools and floats rejected, since
+    SQLite would bind ``True`` onto child 1).  Results are ordered by
+    rising definition id, matching ``list_active_definitions`` and
+    ``list_definitions_firing_on``.  Each entry is a
+    :class:`CreatedQuestDefinition` snapshot bundling the definition with
+    its decoded rule, assignees and windows, read atomically by the DAO.
+    """
+    _validate_child_id(child_id)
+    dao = QuestDefinitionsDao(database)
+    snapshots = await dao.list_snapshots_by_child(child_id)
+    bundles = [_bundle_snapshot(snapshot) for snapshot in snapshots]
+    return sorted(bundles, key=lambda bundle: bundle.definition.id)
+
+
+async def list_definitions_firing_on(
+    database: NestQuestDatabase,
+    date: str,
+) -> list[CreatedQuestDefinition]:
+    """Return the ACTIVE definitions whose rule fires on ``date``.
+
+    ``date`` must be a strict ISO calendar date (YYYY-MM-DD); a malformed
+    value raises ValueError naming the field.  Each active definition's
+    stored rule is decoded through the task-1 storage mapping and handed
+    to the recurrence engine's :func:`~.recurrence.occurs_on`; only the
+    definitions whose decoded rule fires on the date are returned, in
+    rising definition-id order, each as the same rich
+    :class:`CreatedQuestDefinition` snapshot as the rest of the layer.
+    The definitions and their rules are read inside one locked
+    transaction, so a bundle can never filter on one rule while
+    presenting another state's windows.
+    """
+    _validate_date(date, "date")
+    target = datetime.datetime.strptime(date, "%Y-%m-%d").date()
+    dao = QuestDefinitionsDao(database)
+    snapshots = await dao.list_snapshots_active()
+    bundles = [_bundle_snapshot(snapshot) for snapshot in snapshots]
+    return [bundle for bundle in bundles if occurs_on(bundle.rule, target)]

custom_components/nestquest/schema.py

@@ -86,30 +86,54 @@ date range; a single-day override stores the same date in both columns.
 ``is_present`` 0/1 marks the child absent/present for the whole range;
 ``note`` is optional free text.
 
+Multi-assignee definitions (D-008): ``quest_definitions`` carries no
+``child_id`` column.  Assignment lives in
+``quest_definition_assignees``, one row per (definition, child) with a
+composite primary key and foreign keys to the definition and the child,
+so "brush teeth" is one definition covering three children.  The
+migration runner rebuilds a pre-D-008 table into this shape and copies
+its single-assignee column across.  The composite primary key makes
+duplicate assignment impossible at the storage layer.
+
+Quest windows (D-008): ``quest_definition_windows`` declares which day
+windows a definition spans — one row per (definition, window), the
+composite primary key making a window idempotent per definition.
+``window`` is CHECK-constrained to the three spellings ``const`` owns;
+``due_time`` optionally pins a due time inside the window and is
+caller-validated (strict HH:MM) by the DAO layer, matching the date
+policy above.  The window clock ranges live in ``const.py``, not here:
+this layer stores what the caller declares and never interprets clocks.
+
 Quest instances: ``quest_instances`` deliberately carries NO completion
 status column.  An instance's current state derives from the latest row
 in ``completion_events`` (Feature 08), so materialization (Feature 07)
 can insert instances without knowing anything about completion and the
 append-only log stays the single source of truth.  ``definition_id``,
-``due_date`` and ``child_id`` snapshot the materialization-time facts
-("why this instance exists"): reassignment and rule edits change future
-instances only and never rewrite these rows.  ``due_time`` snapshots
-the definition's optional due time at generation for the same reason —
-the instance keeps its generation-time value even if the definition is
-edited later.  ``generated_at`` is a caller-set UTC ISO-8601 timestamp
-per the module timestamp policy (no DB default, so a generation batch
-stamps one coherent time).
+``child_id``, ``due_date`` and ``window`` snapshot the
+materialization-time facts ("why this instance exists"): assignment
+edits and rule edits change future instances only and never rewrite
+these rows.  ``window`` records which declared day window produced the
+instance (D-008), CHECK-constrained to the same three spellings
+``const`` owns.  ``due_time`` snapshots the window's optional due time
+at generation for the same reason — the instance keeps its
+generation-time value even if the definition is edited later.
+``generated_at`` is a caller-set UTC ISO-8601 timestamp per the module
+timestamp policy (no DB default, so a generation batch stamps one
+coherent time).
 
-Uniqueness: the (definition_id, due_date) pair is declared as a
-table-level ``UNIQUE`` constraint rather than a separate ``CREATE
-UNIQUE INDEX`` statement.  SQLite materializes it as an implicit unique
-index (``sqlite_autoindex_quest_instances_1``) — the required "unique
-index prevents duplicate instances" — and the constraint form cannot be
-silently dropped the way a standalone index can, so the duplicate door
-stays shut.  Idempotent materialization keys on exactly this pair.  No
-secondary indexes beyond it are declared yet: history and board queries
-(Features 08/10/13) should justify their indexes as a later migration
-once their query shapes exist.
+Uniqueness: the (definition_id, child_id, due_date, window) tuple is
+declared as a table-level ``UNIQUE`` constraint rather than a separate
+``CREATE UNIQUE INDEX`` statement.  SQLite materializes it as an
+implicit unique index (``sqlite_autoindex_quest_instances_1``) — the
+required "unique index prevents duplicate instances" — and the
+constraint form cannot be silently dropped the way a standalone index
+can, so the duplicate door stays shut.  Idempotent materialization keys
+on exactly this tuple: the twice-daily case (one definition, two
+windows, one child, one date) yields two rows and the shared case (one
+definition, three assignees, one window) yields three.  No secondary
+indexes beyond it are declared yet: history and board queries (Features
+08/10/13) should justify their indexes as a later migration once their
+query shapes exist.
 
 No ``ON DELETE`` clauses are declared on any foreign key in this
 module: children and definitions are deactivated, never deleted, so a
@@ -135,11 +159,12 @@ self-describing without joins.
 Actor policy: ``actor_source`` distinguishes an authenticated HA user
 (``'user'``, with ``actor_user_id`` holding the HA user id) from a
 panel tap with no user context (``'panel'``, with ``actor_user_id``
-NULL — the tapped child profile is already ``child_id``).  A coherence
-CHECK makes the pair shape non-negotiable: ``'user'`` requires
-``actor_user_id``, ``'panel'`` forbids it.  Other actor sources are
-rejected; if an unattended system actor is ever needed, that is a
-schema migration, not a silent widening.
+NULL — the tapped child profile is ``actor_child_id``, D-008).  Two
+coherence CHECKs make both shapes non-negotiable: ``'user'`` requires
+``actor_user_id`` and forbids ``actor_child_id``; ``'panel'`` requires
+``actor_child_id`` (the tapped profile) and forbids ``actor_user_id``.
+Other actor sources are rejected; if an unattended system actor is
+ever needed, that is a schema migration, not a silent widening.
 
 On-time policy: ``was_on_time`` is required (integer 0 or 1) for
 ``completed`` events — at completion time the due date is known and the
@@ -219,18 +244,45 @@ SCHEMA_V1_SCHEDULE_RULES_DDL: list[str] = [
     """,
 ]
 
+#: Column body of ``quest_definitions``, shared between the v1 DDL
+#: below and the multi-assignee rebuild migration, which must recreate
+#: the table in exactly this shape (D-008: one definition, many
+#: assignees via ``quest_definition_assignees`` — no ``child_id``
+#: column on the definition itself).
+QUEST_DEFINITIONS_TABLE_SQL = """(
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    title TEXT NOT NULL,
+    description TEXT,
+    icon TEXT,
+    schedule_rule_id INTEGER NOT NULL REFERENCES schedule_rules(id),
+    due_time TEXT,
+    is_active INTEGER NOT NULL DEFAULT 1 CHECK (typeof(is_active) = 'integer' AND is_active IN (0, 1)),
+    created_at TEXT NOT NULL
+)"""
+
 SCHEMA_V1_QUEST_DEFINITIONS_DDL: list[str] = [
+    f"""
+    CREATE TABLE IF NOT EXISTS quest_definitions {QUEST_DEFINITIONS_TABLE_SQL}
+    """,
+]
+
+SCHEMA_V1_QUEST_DEFINITION_ASSIGNEES_DDL: list[str] = [
     """
-    CREATE TABLE IF NOT EXISTS quest_definitions (
-        id INTEGER PRIMARY KEY AUTOINCREMENT,
-        title TEXT NOT NULL,
-        description TEXT,
-        icon TEXT,
+    CREATE TABLE IF NOT EXISTS quest_definition_assignees (
+        definition_id INTEGER NOT NULL REFERENCES quest_definitions(id),
         child_id INTEGER NOT NULL REFERENCES children(id),
-        schedule_rule_id INTEGER NOT NULL REFERENCES schedule_rules(id),
+        PRIMARY KEY (definition_id, child_id)
+    )
+    """,
+]
+
+SCHEMA_V1_QUEST_DEFINITION_WINDOWS_DDL: list[str] = [
+    """
+    CREATE TABLE IF NOT EXISTS quest_definition_windows (
+        definition_id INTEGER NOT NULL REFERENCES quest_definitions(id),
+        window TEXT NOT NULL CHECK (window IN ('morning', 'afternoon', 'evening')),
         due_time TEXT,
-        is_active INTEGER NOT NULL DEFAULT 1 CHECK (typeof(is_active) = 'integer' AND is_active IN (0, 1)),
-        created_at TEXT NOT NULL
+        PRIMARY KEY (definition_id, window)
     )
     """,
 ]
@@ -271,43 +323,64 @@ SCHEMA_V1_PRESENCE_OVERRIDES_DDL: list[str] = [
     """,
 ]
 
+#: Column body of ``quest_instances``, shared between the v1 DDL
+#: below and the instance-key rebuild migration, which must recreate
+#: the table in exactly this shape (D-008: the instance key is
+#: (definition_id, child_id, due_date, window) — one instance per
+#: assigned child per declared window per firing date).
+QUEST_INSTANCES_TABLE_SQL = """(
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    definition_id INTEGER NOT NULL REFERENCES quest_definitions(id),
+    child_id INTEGER NOT NULL REFERENCES children(id),
+    window TEXT NOT NULL CHECK (window IN ('morning', 'afternoon', 'evening')),
+    due_date TEXT NOT NULL,
+    due_time TEXT,
+    generated_at TEXT NOT NULL,
+    UNIQUE (definition_id, child_id, due_date, window)
+)"""
+
 SCHEMA_V1_QUEST_INSTANCES_DDL: list[str] = [
-    """
-    CREATE TABLE IF NOT EXISTS quest_instances (
-        id INTEGER PRIMARY KEY AUTOINCREMENT,
-        definition_id INTEGER NOT NULL REFERENCES quest_definitions(id),
-        child_id INTEGER NOT NULL REFERENCES children(id),
-        due_date TEXT NOT NULL,
-        due_time TEXT,
-        generated_at TEXT NOT NULL,
-        UNIQUE (definition_id, due_date)
-    )
+    f"""
+    CREATE TABLE IF NOT EXISTS quest_instances {QUEST_INSTANCES_TABLE_SQL}
     """,
 ]
 
-SCHEMA_V1_COMPLETION_EVENTS_DDL: list[str] = [
-    """
-    CREATE TABLE IF NOT EXISTS completion_events (
-        id INTEGER PRIMARY KEY AUTOINCREMENT,
-        instance_id INTEGER NOT NULL REFERENCES quest_instances(id),
-        child_id INTEGER NOT NULL REFERENCES children(id),
-        event_type TEXT NOT NULL CHECK (event_type IN ('completed', 'uncompleted')),
-        actor_source TEXT NOT NULL CHECK (actor_source IN ('user', 'panel')),
-        actor_user_id TEXT,
-        occurred_at TEXT NOT NULL,
-        was_on_time INTEGER CHECK (
-            was_on_time IS NULL
-            OR (typeof(was_on_time) = 'integer' AND was_on_time IN (0, 1))
-        ),
-        CHECK (
-            (actor_source = 'user' AND actor_user_id IS NOT NULL)
-            OR (actor_source = 'panel' AND actor_user_id IS NULL)
-        ),
-        CHECK (
-            (event_type = 'completed' AND was_on_time IS NOT NULL)
-            OR (event_type = 'uncompleted')
-        )
+#: Column body of ``completion_events``, shared between the v1 DDL
+#: below and the actor-child rebuild migration, which must recreate the
+#: table in exactly this shape (D-008: ``actor_child_id`` records which
+#: panel profile was tapped — set for panel events, NULL for admin
+#: ones; legacy panel rows backfill to ``child_id``, the child they
+#: always were).
+COMPLETION_EVENTS_TABLE_SQL = """(
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    instance_id INTEGER NOT NULL REFERENCES quest_instances(id),
+    child_id INTEGER NOT NULL REFERENCES children(id),
+    event_type TEXT NOT NULL CHECK (event_type IN ('completed', 'uncompleted')),
+    actor_source TEXT NOT NULL CHECK (actor_source IN ('user', 'panel')),
+    actor_user_id TEXT,
+    actor_child_id INTEGER REFERENCES children(id),
+    occurred_at TEXT NOT NULL,
+    was_on_time INTEGER CHECK (
+        was_on_time IS NULL
+        OR (typeof(was_on_time) = 'integer' AND was_on_time IN (0, 1))
+    ),
+    CHECK (
+        (actor_source = 'user' AND actor_user_id IS NOT NULL)
+        OR (actor_source = 'panel' AND actor_user_id IS NULL)
+    ),
+    CHECK (
+        (actor_source = 'user' AND actor_child_id IS NULL)
+        OR (actor_source = 'panel' AND actor_child_id IS NOT NULL)
+    ),
+    CHECK (
+        (event_type = 'completed' AND was_on_time IS NOT NULL)
+        OR (event_type = 'uncompleted')
     )
+)"""
+
+SCHEMA_V1_COMPLETION_EVENTS_DDL: list[str] = [
+    f"""
+    CREATE TABLE IF NOT EXISTS completion_events {COMPLETION_EVENTS_TABLE_SQL}
     """,
 ]
 
@@ -316,6 +389,8 @@ SCHEMA_V1_STATEMENTS: list[str] = [
     *SCHEMA_V1_ADMIN_USERS_DDL,
     *SCHEMA_V1_SCHEDULE_RULES_DDL,
     *SCHEMA_V1_QUEST_DEFINITIONS_DDL,
+    *SCHEMA_V1_QUEST_DEFINITION_ASSIGNEES_DDL,
+    *SCHEMA_V1_QUEST_DEFINITION_WINDOWS_DDL,
     *SCHEMA_V1_PRESENCE_SCHEDULES_DDL,
     *SCHEMA_V1_PRESENCE_OVERRIDES_DDL,
     *SCHEMA_V1_QUEST_INSTANCES_DDL,

custom_components/nestquest/services.yaml

@@ -0,0 +1,12 @@
+# Service declarations for the NestQuest integration (Home Assistant
+# services.yaml metadata). Services are domain-scoped: nested under the
+# "nestquest" domain, not repeated per config entry.
+
+regenerate:
+  name: Regenerate quest instances
+  description: >-
+    Regenerate every future quest instance for the household over the rolling
+    horizon, using the same idempotent materialization as the daily rollover
+    and the startup backfill. Safe to call at any time: a re-run refreshes the
+    same rows instead of duplicating them, and completed instances are never
+    touched.

custom_components/nestquest/strings.json

@@ -22,13 +22,16 @@
         "data": {
           "horizon_days": "Generation horizon (days)",
           "day_rollover_time": "Day rollover time (HH:MM)",
-          "panel_idle_timeout": "Panel idle timeout (seconds)"
+          "panel_idle_timeout": "Panel idle timeout (seconds)",
+          "admin_user_ids": "Admin users (parents)"
         }
       }
     },
     "errors": {
       "invalid": "Invalid value.",
-      "invalid_time": "Time must use 24-hour HH:MM format."
+      "invalid_time": "Time must use 24-hour HH:MM format.",
+      "no_admins": "Select at least one admin user; an empty allowlist would lock everyone out.",
+      "invalid_admin": "Invalid admin selection."
     }
   }
-}
+}

custom_components/nestquest/translations/en.json

@@ -22,13 +22,16 @@
         "data": {
           "horizon_days": "Generation horizon (days)",
           "day_rollover_time": "Day rollover time (HH:MM)",
-          "panel_idle_timeout": "Panel idle timeout (seconds)"
+          "panel_idle_timeout": "Panel idle timeout (seconds)",
+          "admin_user_ids": "Admin users (parents)"
         }
       }
     },
     "errors": {
       "invalid": "Invalid value.",
-      "invalid_time": "Time must use 24-hour HH:MM format."
+      "invalid_time": "Time must use 24-hour HH:MM format.",
+      "no_admins": "Select at least one admin user; an empty allowlist would lock everyone out.",
+      "invalid_admin": "Invalid admin selection."
     }
   }
-}
+}

tests/conftest.py

@@ -29,7 +29,7 @@ import tempfile
 import weakref
 from pathlib import Path
 from types import SimpleNamespace
-from unittest.mock import MagicMock
+from unittest.mock import AsyncMock, MagicMock
 
 import pytest
 
@@ -42,6 +42,9 @@ _HA_MODULES = (
     "homeassistant.config_entries",
     "homeassistant.data_entry_flow",
     "homeassistant.exceptions",
+    "homeassistant.helpers",
+    "homeassistant.helpers.config_validation",
+    "homeassistant.helpers.event",
 )
 
 def _find_spec(name: str):
@@ -79,6 +82,9 @@ for _parent, _child in (
     ("homeassistant", "data_entry_flow"),
     ("homeassistant", "core"),
     ("homeassistant", "exceptions"),
+    ("homeassistant", "helpers"),
+    ("homeassistant.helpers", "config_validation"),
+    ("homeassistant.helpers", "event"),
 ):
     setattr(sys.modules[_parent], _child, sys.modules[f"{_parent}.{_child}"])
 
@@ -181,6 +187,30 @@ class ConfigEntryNotReady(Exception):
 
 _exceptions_mock.ConfigEntryNotReady = ConfigEntryNotReady
 
+import voluptuous as vol
+
+
+def _multi_select(choices: dict):
+    """Mirror homeassistant.helpers.config_validation.multi_select.
+
+    The options flow's admin picker uses HA's supported multi-select
+    validator (schema-serializable by HA's frontend); the mock provides
+    the same contract: a list whose members are keys of ``choices``.
+    """
+
+    def _validate(selected):
+        if not isinstance(selected, list):
+            raise vol.Invalid("Not a list")
+        for value in selected:
+            if value not in choices:
+                raise vol.Invalid(f"{value} is not a valid option")
+        return selected
+
+    return _validate
+
+
+_ha_mock("homeassistant.helpers.config_validation").multi_select = _multi_select
+
 
 # ---------------------------------------------------------------------------
 # Shared helpers for the behavior tests.
@@ -214,16 +244,129 @@ class ListenerRegistry:
         return sum(len(listeners) for listeners in self._listeners.values())
 
 
+class TimeChangeRegistry:
+    """Models HA's time-change listener bookkeeping.
+
+    ``track`` mirrors ``homeassistant.helpers.event.async_track_time_change``:
+    each call appends a record (action + hour/minute/second) and returns
+    a remove callable that reverses the registration.  Tests inspect
+    ``registrations`` and exercise the newest action through :meth:`fire`.
+    """
+
+    def __init__(self, hass=None):
+        self._hass = hass
+        self._registrations: list[dict] = []
+
+    def track(self, action, hour=None, minute=None, second=None):
+        record = {
+            "action": action,
+            "hour": hour,
+            "minute": minute,
+            "second": second,
+        }
+
+        def _remove():
+            self._registrations.remove(record)
+
+        record["remove"] = _remove
+        self._registrations.append(record)
+        return _remove
+
+    @property
+    def registrations(self):
+        """Return a copy of the live registrations."""
+        return list(self._registrations)
+
+    @property
+    def size(self) -> int:
+        """Number of live registrations."""
+        return len(self._registrations)
+
+    async def fire(self, now=None, index: int = -1):
+        """Run a registered action as HA's scheduler would, awaiting coroutines."""
+        result = self._registrations[index]["action"](now)
+        if inspect.isawaitable(result):
+            await result
+
+
+def _async_track_time_change(hass, action, hour=None, minute=None, second=None):
+    """Mirror homeassistant.helpers.event.async_track_time_change.
+
+    Exact HA 2024.6 signature — no ``local`` keyword: the local-time
+    wrapper is already this function.  Routes to the registry attached to
+    ``hass`` (created on demand), so tests reach the registrations via
+    ``hass.time_change``.
+    """
+    registry = getattr(hass, "time_change", None)
+    if registry is None:
+        registry = TimeChangeRegistry(hass)
+        hass.time_change = registry
+    return registry.track(action, hour=hour, minute=minute, second=second)
+
+
+_ha_mock("homeassistant.helpers.event").async_track_time_change = _async_track_time_change
+
+
+class ServiceRegistry:
+    """Models HA's ``hass.services`` service registry.
+
+    ``async_register`` stores a handler under its (domain, service) key,
+    ``has_service`` reports registration, and ``async_remove`` removes it
+    — exactly the surface Home Assistant's ``ServiceRegistry`` exposes
+    (there is deliberately NO ``async_unregister`` alias here, so a caller
+    that uses the wrong method name fails instead of being silently
+    papered over).  ``call`` invokes a stored handler the way HA's service
+    bus would — awaiting a coroutine result — so tests can exercise a
+    registered service end-to-end.
+    """
+
+    def __init__(self, hass=None):
+        self._hass = hass
+        self._services: dict[tuple[str, str], object] = {}
+
+    def async_register(self, domain, service, func, schema=None, supports_response=None):
+        self._services[(domain, service)] = func
+        return None
+
+    def has_service(self, domain, service):
+        return (domain, service) in self._services
+
+    def async_remove(self, domain, service):
+        self._services.pop((domain, service), None)
+        return None
+
+    async def call(self, domain, service, data=None):
+        func = self._services.get((domain, service))
+        if func is None:
+            raise KeyError(f"service {domain}.{service} not registered")
+        call = SimpleNamespace(domain=domain, service=service, data=data or {})
+        result = func(call)
+        if inspect.isawaitable(result):
+            await result
+        return result
+
+    @property
+    def registered_services(self):
+        """The registered (domain, service) pairs."""
+        return list(self._services)
+
+
 def make_config_entry(
     entry_id: str = "test_entry",
     options: dict | None = None,
     data: dict | None = None,
+    context: dict | None = None,
 ):
-    """Create a stub config entry shaped like HA's ConfigEntry for tests."""
+    """Create a stub config entry shaped like HA's ConfigEntry for tests.
+
+    ``context`` mirrors HA's entry context (the flow that created the
+    entry carries the acting HA user under ``context["user_id"]``).
+    """
     entry = SimpleNamespace(
         entry_id=entry_id,
         options=dict(options or {}),
         data=dict(data or {}),
+        context=dict(context or {}),
     )
     entry.add_update_listener = None
     return entry
@@ -247,6 +390,10 @@ def make_hass() -> tuple:
         config=MagicMock(),
         config_entries=SimpleNamespace(async_reload=None),
     )
+    # hass.auth mirrors the real surface the integration reads: an
+    # async_get_users list the tests can repoint at will (the setup
+    # path resolves HA owner accounts as the last-resort admin seed).
+    hass.auth = SimpleNamespace(async_get_users=AsyncMock(return_value=[]))
 
     def _cleanup_config_dir():
         import shutil
@@ -265,6 +412,11 @@ def make_hass() -> tuple:
 
     hass.async_add_executor_job = _run_executor_job
     registry = ListenerRegistry(hass)
+    hass.time_change = TimeChangeRegistry(hass)
+    hass.services = ServiceRegistry(hass)
+    # A valid IANA time zone (the day-rollover listener reads it to
+    # compute "today" in HA local time).
+    hass.config.time_zone = "UTC"
 
     async def _async_reload(entry_id: str) -> None:
         registry.reloaded.append(entry_id)
@@ -302,8 +454,15 @@ async def hass():
 def make_entry():
     """Provide the config-entry factory as a fixture."""
 
-    def _factory(entry_id: str = "test_entry", options: dict | None = None, data: dict | None = None):
-        return make_config_entry(entry_id=entry_id, options=options, data=data)
+    def _factory(
+        entry_id: str = "test_entry",
+        options: dict | None = None,
+        data: dict | None = None,
+        context: dict | None = None,
+    ):
+        return make_config_entry(
+            entry_id=entry_id, options=options, data=data, context=context
+        )
 
     return _factory
 

tests/test_admin_allowlist.py

@@ -0,0 +1,471 @@
+"""Tests for admin_allowlist.py: the Feature 03 allowlist business layer."""
+from __future__ import annotations
+
+import asyncio
+from types import SimpleNamespace
+from unittest.mock import AsyncMock, MagicMock
+
+import pytest
+
+from custom_components.nestquest import async_setup_entry, async_unload_entry
+from custom_components.nestquest.admin_allowlist import (
+    list_admin_ids,
+    seed_setup_admin,
+    set_admin_ids,
+)
+from custom_components.nestquest.dao_children import AdminUsersDao
+from custom_components.nestquest.db import NestQuestDatabase
+from custom_components.nestquest.migrations import apply_migrations
+
+
+def _run(coro):
+    return asyncio.new_event_loop().run_until_complete(coro)
+
+
+def _make_hass_mock():
+    hass = MagicMock()
+    hass.async_add_executor_job = AsyncMock(side_effect=(lambda fn, *a: fn(*a)))
+    return hass
+
+
+def _with_db(tmp_path, name):
+    def _run_test(body):
+        async def _main():
+            database = NestQuestDatabase(_make_hass_mock())
+            await database.open(tmp_path / name)
+            try:
+                await apply_migrations(database)
+                return await body(database)
+            finally:
+                await database.close()
+
+        return _run(_main())
+
+    return _run_test
+
+
+# ---------------------------------------------------------------------------
+# set_admin_ids: read/write with the fail-closed guarantee
+# ---------------------------------------------------------------------------
+
+
+def test_set_admin_ids_round_trip(tmp_path) -> None:
+    async def _body(database):
+        await set_admin_ids(database, ["user-owner", "user-parent"])
+        # Membership is the contract; AdminUsersDao.list orders by id.
+        assert sorted(await list_admin_ids(database)) == [
+            "user-owner",
+            "user-parent",
+        ]
+        # Replace: the removed id is gone, the new one present.
+        await set_admin_ids(database, ["user-parent", "user-grandma"])
+        assert sorted(await list_admin_ids(database)) == [
+            "user-grandma",
+            "user-parent",
+        ]
+        return await list_admin_ids(database)
+
+    _with_db(tmp_path, "set-round-trip.db")(_body)
+
+
+def test_set_admin_ids_rejects_empty_allowlist(tmp_path) -> None:
+    """Removing the last admin (or saving an empty selection) is
+    refused with a clear error: an empty allowlist fails closed, so
+    the owner must never be able to reach one through this API."""
+    async def _body(database):
+        await set_admin_ids(database, ["user-owner"])
+        with pytest.raises(ValueError, match="at least one admin"):
+            await set_admin_ids(database, [])
+        # The refused write left the allowlist intact.
+        assert await list_admin_ids(database) == ["user-owner"]
+        return None
+
+    _with_db(tmp_path, "set-empty-refused.db")(_body)
+
+
+@pytest.mark.parametrize(
+    "bad", [None, "notalist", [42], [None], [""], ["  "], 5]
+)
+def test_set_admin_ids_rejects_malformed_input(tmp_path, bad) -> None:
+    async def _body(database):
+        with pytest.raises(ValueError):
+            await set_admin_ids(database, bad)
+        assert await list_admin_ids(database) == []
+        return None
+
+    _with_db(tmp_path, "set-malformed.db")(_body)
+
+
+def test_set_admin_ids_rejects_duplicates(tmp_path) -> None:
+    async def _body(database):
+        with pytest.raises(ValueError, match="duplicates"):
+            await set_admin_ids(database, ["user-a", "user-a"])
+        assert await list_admin_ids(database) == []
+        return None
+
+    _with_db(tmp_path, "set-duplicates.db")(_body)
+
+
+def test_set_admin_ids_trims_and_replaces_atomically(tmp_path) -> None:
+    async def _body(database):
+        await set_admin_ids(database, ["  user-a  "])
+        assert await list_admin_ids(database) == ["user-a"]
+        # Sync that both adds and removes in one write.
+        await set_admin_ids(database, ["user-b", "user-c"])
+        assert await list_admin_ids(database) == ["user-b", "user-c"]
+        return None
+
+    _with_db(tmp_path, "set-trim.db")(_body)
+
+
+# ---------------------------------------------------------------------------
+# seed_setup_admin: the owner is never locked out on first setup
+# ---------------------------------------------------------------------------
+
+
+def test_seed_adds_context_user_on_first_setup(tmp_path) -> None:
+    async def _body(database):
+        seeded = await seed_setup_admin(
+            database, stored_admin_ids=None, context_user_id="owner-1"
+        )
+        assert seeded == ["owner-1"]
+        assert await list_admin_ids(database) == ["owner-1"]
+        return seeded
+
+    _with_db(tmp_path, "seed-context.db")(_body)
+
+
+def test_seed_prefers_stored_entry_ids_over_context(tmp_path) -> None:
+    async def _body(database):
+        seeded = await seed_setup_admin(
+            database,
+            stored_admin_ids=["user-a", "user-b"],
+            context_user_id="owner-1",
+        )
+        assert seeded == ["user-a", "user-b"]
+        return seeded
+
+    _with_db(tmp_path, "seed-stored.db")(_body)
+
+
+def test_seed_leaves_nonempty_allowlist_untouched(tmp_path) -> None:
+    """Re-running setup must never resurrect a deliberately narrowed
+    list: only an EMPTY allowlist is seeded."""
+    async def _body(database):
+        await set_admin_ids(database, ["user-kept"])
+        seeded = await seed_setup_admin(
+            database,
+            stored_admin_ids=["user-a", "user-b"],
+            context_user_id="owner-1",
+        )
+        assert seeded == ["user-kept"]
+        assert await list_admin_ids(database) == ["user-kept"]
+        return seeded
+
+    _with_db(tmp_path, "seed-narrowed.db")(_body)
+
+
+def test_seed_with_nothing_available_leaves_empty(tmp_path) -> None:
+    async def _body(database):
+        seeded = await seed_setup_admin(
+            database, stored_admin_ids=None, context_user_id=None
+        )
+        assert seeded == []
+        return seeded
+
+    _with_db(tmp_path, "seed-nothing.db")(_body)
+
+
+def test_seed_rejects_malformed_candidates(tmp_path) -> None:
+    async def _body(database):
+        with pytest.raises(ValueError):
+            await seed_setup_admin(
+                database, stored_admin_ids=[42], context_user_id=None
+            )
+        with pytest.raises(ValueError):
+            await seed_setup_admin(
+                database, stored_admin_ids=None, context_user_id="  "
+            )
+        assert await list_admin_ids(database) == []
+        return None
+
+    _with_db(tmp_path, "seed-malformed.db")(_body)
+
+
+# ---------------------------------------------------------------------------
+# Setup wiring: async_setup_entry seeds automatically
+# ---------------------------------------------------------------------------
+
+
+async def _setup_entry(hass, entry, registry):
+    from tests.test_lifecycle import _wire
+
+    entry = _wire(entry, registry)
+    await async_setup_entry(hass, entry)
+    return entry
+
+
+async def test_setup_seeds_allowlist_from_entry_context(
+    hass, make_entry
+) -> None:
+    entry = await _setup_entry(
+        hass,
+        make_entry(context={"user_id": "ha-owner"}),
+        hass.registry,
+    )
+    database = entry.runtime_data.database
+    try:
+        assert await list_admin_ids(database) == ["ha-owner"]
+    finally:
+        await database.close()
+    assert await async_unload_entry(hass, entry) is True
+
+
+async def test_setup_seeds_allowlist_from_stored_entry_data(
+    hass, make_entry
+) -> None:
+    """A lost database re-seeded from the entry's stored admin copy."""
+    from custom_components.nestquest.const import CONF_ADMIN_USER_IDS
+
+    entry = await _setup_entry(
+        hass,
+        make_entry(data={CONF_ADMIN_USER_IDS: ["user-a", "user-b"]}),
+        hass.registry,
+    )
+    database = entry.runtime_data.database
+    try:
+        assert await list_admin_ids(database) == ["user-a", "user-b"]
+    finally:
+        await database.close()
+    assert await async_unload_entry(hass, entry) is True
+
+
+async def test_setup_without_context_leaves_allowlist_empty(
+    hass, make_entry
+) -> None:
+    """Fail closed: no context user and no stored copy means an empty
+    allowlist — nobody is admin until the owner configures it."""
+    entry = await _setup_entry(hass, make_entry(), hass.registry)
+    database = entry.runtime_data.database
+    try:
+        assert await list_admin_ids(database) == []
+    finally:
+        await database.close()
+    assert await async_unload_entry(hass, entry) is True
+
+
+async def test_setup_does_not_reseed_narrowed_allowlist(
+    hass, make_entry
+) -> None:
+    from custom_components.nestquest import async_unload_entry
+    from custom_components.nestquest.const import CONF_ADMIN_USER_IDS
+
+    entry = await _setup_entry(
+        hass, make_entry(context={"user_id": "ha-owner"}), hass.registry
+    )
+    database = entry.runtime_data.database
+    await set_admin_ids(database, ["user-parent"])
+    await database.close()
+    assert await async_unload_entry(hass, entry) is True
+
+    # Reload with the SAME context: the narrowed list survives.
+    entry_reloaded = await _setup_entry(
+        hass, make_entry(context={"user_id": "ha-owner"}), hass.registry
+    )
+    database_b = entry_reloaded.runtime_data.database
+    try:
+        assert await list_admin_ids(database_b) == ["user-parent"]
+    finally:
+        await database.close()
+    assert await async_unload_entry(hass, entry_reloaded) is True
+
+
+async def test_setup_seed_prefers_options_over_entry_data(
+    hass, make_entry
+) -> None:
+    """Seed precedence on a fresh database: the options flow's saved
+    list (the current one) beats the config flow's original copy."""
+    from custom_components.nestquest.const import CONF_ADMIN_USER_IDS
+
+    entry = await _setup_entry(
+        hass,
+        make_entry(
+            options={CONF_ADMIN_USER_IDS: ["user-current"]},
+            data={CONF_ADMIN_USER_IDS: ["ha-owner"]},
+            context={"user_id": "ha-owner"},
+        ),
+        hass.registry,
+    )
+    database = entry.runtime_data.database
+    try:
+        assert await list_admin_ids(database) == ["user-current"]
+    finally:
+        await database.close()
+    assert await async_unload_entry(hass, entry) is True
+
+
+async def test_setup_owner_fallback_seeds_owner_accounts(
+    hass, make_entry
+) -> None:
+    """Last-resort seed: with no persisted copy and no flow-context
+    user, HA owner accounts are seeded so first setup is never
+    ownerless (the real flow may lose the context; owners can already
+    do everything in HA)."""
+    from unittest.mock import AsyncMock
+
+    hass.auth.async_get_users = AsyncMock(
+        return_value=[
+            SimpleNamespace(id="owner-1", is_owner=True),
+            SimpleNamespace(id="member-1", is_owner=False),
+            SimpleNamespace(id="owner-2", is_owner=True),
+        ]
+    )
+    entry = await _setup_entry(hass, make_entry(), hass.registry)
+    database = entry.runtime_data.database
+    try:
+        assert sorted(await list_admin_ids(database)) == ["owner-1", "owner-2"]
+    finally:
+        await database.close()
+    assert await async_unload_entry(hass, entry) is True
+
+
+async def test_setup_owner_fallback_not_used_when_context_present(
+    hass, make_entry
+) -> None:
+    """The context user (flow caller) wins over the owner fallback:
+    a non-owner parent configuring the integration becomes the admin."""
+    from unittest.mock import AsyncMock
+
+    hass.auth.async_get_users = AsyncMock(
+        return_value=[SimpleNamespace(id="owner-1", is_owner=True)]
+    )
+    entry = await _setup_entry(
+        hass,
+        make_entry(context={"user_id": "parent-configured"}),
+        hass.registry,
+    )
+    database = entry.runtime_data.database
+    try:
+        assert await list_admin_ids(database) == ["parent-configured"]
+    finally:
+        await database.close()
+    assert await async_unload_entry(hass, entry) is True
+
+
+def test_seed_owner_ids_argument(tmp_path) -> None:
+    async def _body(database):
+        # Malformed owner lists are rejected like any other candidate —
+        # while the allowlist is still empty, so the seed proceeds far
+        # enough to validate.
+        with pytest.raises(ValueError):
+            await seed_setup_admin(
+                database,
+                stored_admin_ids=None,
+                context_user_id=None,
+                owner_ids=[7],
+            )
+        assert await list_admin_ids(database) == []
+        seeded = await seed_setup_admin(
+            database,
+            stored_admin_ids=None,
+            context_user_id=None,
+            owner_ids=["owner-1"],
+        )
+        assert seeded == ["owner-1"]
+        return seeded
+
+    _with_db(tmp_path, "seed-owner-arg.db")(_body)
+
+
+async def test_reopened_setup_failure_closes_database(
+    hass, make_entry, monkeypatch
+) -> None:
+    """A seeding failure on the reopened-record path closes the just-
+    opened connection before re-raising (no leaked handles across HA's
+    setup retries)."""
+    import pytest as pytest_module
+    from unittest.mock import AsyncMock
+
+    import custom_components.nestquest as nestquest_module
+    from custom_components.nestquest.db import NestQuestDatabase
+
+    # First: a successful setup to create the runtime record and file.
+    entry = await _setup_entry(hass, make_entry(), hass.registry)
+    await async_unload_entry(hass, entry)
+
+    # Now a re-setup whose seeding fails after the reopen.
+    async def _failing_seed(database, **kwargs):
+        raise RuntimeError("seed boom")
+
+    monkeypatch.setattr(
+        nestquest_module, "seed_setup_admin", _failing_seed, raising=True
+    )
+
+    close_calls: list[bool] = []
+    original_close = NestQuestDatabase.close
+
+    async def _spy_close(self):
+        close_calls.append(True)
+        return await original_close(self)
+
+    monkeypatch.setattr(NestQuestDatabase, "close", _spy_close)
+
+    with pytest_module.raises(RuntimeError, match="seed boom"):
+        await _setup_entry(hass, entry, hass.registry)
+    # The reopen path opened AND closed a connection; the failure is
+    # the last thing observed.
+    assert close_calls[-1] is True
+
+
+# ---------------------------------------------------------------------------
+# is_admin: the fail-closed resolver (Feature 09's verdict function)
+# ---------------------------------------------------------------------------
+
+
+def test_is_admin_verdict_matrix(tmp_path) -> None:
+    async def _body(database):
+        from custom_components.nestquest.admin_allowlist import is_admin
+
+        await set_admin_ids(database, ["user-owner"])
+        assert await is_admin(database, "user-owner") is True
+        assert await is_admin(database, "user-other") is False
+        # Unknown, malformed, and absent identities all fail closed.
+        assert await is_admin(database, "") is False
+        assert await is_admin(database, "  user-owner  ") is False, (
+            "ids are stored trimmed; an untrimmed lookup is a different "
+            "id and must not match"
+        )
+        assert await is_admin(database, None) is False
+        assert await is_admin(database, 42) is False
+        assert await is_admin(database, ["user-owner"]) is False
+        assert await is_admin(database, True) is False
+        return None
+
+    _with_db(tmp_path, "resolver-matrix.db")(_body)
+
+
+def test_is_admin_empty_allowlist_fails_closed(tmp_path) -> None:
+    """An empty allowlist returns False for EVERYONE, not True."""
+    async def _body(database):
+        from custom_components.nestquest.admin_allowlist import is_admin
+
+        for candidate in ("user-owner", "", None, 1):
+            assert await is_admin(database, candidate) is False
+        return None
+
+    _with_db(tmp_path, "resolver-empty.db")(_body)
+
+
+def test_is_admin_false_after_last_admin_removal_attempt(tmp_path) -> None:
+    """The refusal keeps the verdict sound: a refused removal leaves
+    the admin in place, so is_admin still resolves True."""
+    async def _body(database):
+        from custom_components.nestquest.admin_allowlist import is_admin
+
+        await set_admin_ids(database, ["user-owner"])
+        with pytest.raises(ValueError, match="at least one admin"):
+            await set_admin_ids(database, [])
+        assert await is_admin(database, "user-owner") is True
+        return None
+
+    _with_db(tmp_path, "resolver-refusal.db")(_body)

tests/test_children_registry.py

@@ -0,0 +1,842 @@
+"""Tests for children.py: the Feature 03 child-profile business layer."""
+from __future__ import annotations
+
+import asyncio
+import logging
+import re
+from unittest.mock import AsyncMock, MagicMock
+
+import pytest
+
+from custom_components.nestquest.children import (
+    create_child,
+    edit_child,
+    list_children,
+    reorder_children,
+    set_child_active,
+)
+from custom_components.nestquest.dao_children import ChildRecord, ChildrenDao
+from custom_components.nestquest.db import NestQuestDatabase
+from custom_components.nestquest.migrations import apply_migrations
+
+
+def _run(coro):
+    return asyncio.new_event_loop().run_until_complete(coro)
+
+
+def _make_hass_mock():
+    hass = MagicMock()
+    hass.async_add_executor_job = AsyncMock(side_effect=(lambda fn, *a: fn(*a)))
+    return hass
+
+
+def _with_db(tmp_path, name):
+    def _run_test(body):
+        async def _main():
+            database = NestQuestDatabase(_make_hass_mock())
+            await database.open(tmp_path / name)
+            try:
+                await apply_migrations(database)
+                return await body(database)
+            finally:
+                await database.close()
+
+        return _run(_main())
+
+    return _run_test
+
+
+# ---------------------------------------------------------------------------
+# create_child: required, trimmed display name
+# ---------------------------------------------------------------------------
+
+
+def test_create_child_returns_typed_record(tmp_path) -> None:
+    async def _body(database):
+        child = await create_child(
+            database,
+            "  Declan  ",
+            colour="#2E7D32",
+            avatar_ref="avatars/declan.png",
+            sort_order=2,
+        )
+        assert isinstance(child, ChildRecord)
+        # The name is trimmed before storage.
+        assert child.display_name == "Declan"
+        assert child.colour == "#2E7D32"
+        assert child.avatar_ref == "avatars/declan.png"
+        assert child.sort_order == 2
+        assert child.is_active is True
+        # The business layer stamps created_at in strict UTC shape.
+        assert re.fullmatch(
+            r"\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\+00:00", child.created_at
+        )
+        return child
+
+    _with_db(tmp_path, "create-typed.db")(_body)
+
+
+def test_create_child_defaults(tmp_path) -> None:
+    async def _body(database):
+        child = await create_child(database, "Chloe")
+        assert child.display_name == "Chloe"
+        assert child.colour is None
+        assert child.avatar_ref is None
+        assert child.sort_order == 0
+        return child
+
+    _with_db(tmp_path, "create-defaults.db")(_body)
+
+
+@pytest.mark.parametrize("bad", ["", "   ", "\t\n", None])
+def test_create_child_missing_name_rejected(tmp_path, bad) -> None:
+    async def _body(database):
+        with pytest.raises(ValueError, match="display_name is required"):
+            await create_child(database, bad)
+        assert await list_children(database) == []
+        return None
+
+    _with_db(tmp_path, "create-empty-name.db")(_body)
+
+
+@pytest.mark.parametrize("bad", [42, ["Ada"], 3.5])
+def test_create_child_non_string_name_rejected(tmp_path, bad) -> None:
+    async def _body(database):
+        with pytest.raises(ValueError, match="must be a string"):
+            await create_child(database, bad)
+        return None
+
+    _with_db(tmp_path, "create-bad-name-type.db")(_body)
+
+
+def test_create_child_optional_text_fields_validated(tmp_path) -> None:
+    async def _body(database):
+        with pytest.raises(ValueError, match="colour must be a string"):
+            await create_child(database, "Ada", colour=7)
+        with pytest.raises(ValueError, match="avatar_ref must be a string"):
+            await create_child(database, "Ada", avatar_ref=1.5)
+        return None
+
+    _with_db(tmp_path, "create-bad-optional.db")(_body)
+
+
+@pytest.mark.parametrize("bad", ["2", 1.5, True, None])
+def test_create_child_sort_order_must_be_int(tmp_path, bad) -> None:
+    async def _body(database):
+        with pytest.raises(ValueError, match="sort_order must be an integer"):
+            await create_child(database, "Ada", sort_order=bad)
+        return None
+
+    _with_db(tmp_path, "create-bad-order.db")(_body)
+
+
+# ---------------------------------------------------------------------------
+# create_child: duplicate display name allowed but warned
+# ---------------------------------------------------------------------------
+
+
+def test_create_child_duplicate_name_allowed_and_warned(
+    tmp_path, caplog
+) -> None:
+    async def _body(database):
+        first = await create_child(database, "Ada")
+        with caplog.at_level(
+            logging.WARNING, logger="custom_components.nestquest.children"
+        ):
+            second = await create_child(database, "  ADA ")
+        # Whitespace/case-normalised duplicate: allowed, both rows exist.
+        assert first.display_name == "Ada"
+        assert second.display_name == "ADA"
+        names = [c.display_name for c in await list_children(database)]
+        assert names == ["Ada", "ADA"]
+        warnings = [
+            r for r in caplog.records if "duplicates existing child" in r.getMessage()
+        ]
+        assert len(warnings) == 1, (
+            "exactly one duplicate warning for the second create"
+        )
+        assert "Ada" in warnings[0].getMessage()
+        return second
+
+    _with_db(tmp_path, "create-duplicate.db")(_body)
+
+
+def test_create_child_distinct_name_logs_no_warning(
+    tmp_path, caplog
+) -> None:
+    async def _body(database):
+        await create_child(database, "Ada")
+        caplog.clear()
+        await create_child(database, "Jordyn")
+        warnings = [
+            r for r in caplog.records if "duplicates existing child" in r.getMessage()
+        ]
+        assert warnings == []
+        return None
+
+    _with_db(tmp_path, "create-no-duplicate.db")(_body)
+
+
+# ---------------------------------------------------------------------------
+# edit_child: returns the updated record
+# ---------------------------------------------------------------------------
+
+
+def test_edit_child_updates_fields_and_returns_record(tmp_path) -> None:
+    async def _body(database):
+        child = await create_child(database, "Ada", colour="#111111")
+        edited = await edit_child(
+            database,
+            child.id,
+            display_name="  Ada L. ",
+            colour="#222222",
+            avatar_ref="avatars/ada.png",
+            sort_order=3,
+        )
+        assert isinstance(edited, ChildRecord)
+        assert edited.id == child.id
+        assert edited.display_name == "Ada L."
+        assert edited.colour == "#222222"
+        assert edited.avatar_ref == "avatars/ada.png"
+        assert edited.sort_order == 3
+        # The stored row reflects every edit.
+        stored = await list_children(database)
+        assert len(stored) == 1
+        assert stored[0] == edited
+        return edited
+
+    _with_db(tmp_path, "edit-round-trip.db")(_body)
+
+
+def test_edit_child_omitted_fields_unchanged(tmp_path) -> None:
+    async def _body(database):
+        child = await create_child(
+            database, "Ada", colour="#111111", sort_order=5
+        )
+        edited = await edit_child(database, child.id, sort_order=9)
+        # Only sort_order moved; colour and name untouched.
+        assert edited.sort_order == 9
+        assert edited.colour == "#111111"
+        assert edited.display_name == "Ada"
+        return edited
+
+    _with_db(tmp_path, "edit-partial.db")(_body)
+
+
+def test_edit_child_no_fields_returns_current_record(tmp_path) -> None:
+    async def _body(database):
+        child = await create_child(database, "Ada", colour="#111111")
+        edited = await edit_child(database, child.id)
+        assert edited == child
+        return edited
+
+    _with_db(tmp_path, "edit-noop.db")(_body)
+
+
+def test_edit_child_missing_raises(tmp_path) -> None:
+    async def _body(database):
+        with pytest.raises(ValueError, match="does not exist"):
+            await edit_child(database, 999, display_name="X")
+        return None
+
+    _with_db(tmp_path, "edit-missing.db")(_body)
+
+
+@pytest.mark.parametrize("bad", [True, False, 1.0, "1", None])
+def test_edit_child_non_int_id_rejected(tmp_path, bad) -> None:
+    """SQLite binds bools as integers: True must not address child 1,
+    and floats must not round onto a real profile."""
+    async def _body(database):
+        child = await create_child(database, "Ada")
+        with pytest.raises(ValueError, match="child_id must be an integer"):
+            await edit_child(database, bad, display_name="X")
+        # The refused edit left the profile untouched.
+        assert (await list_children(database))[0].display_name == "Ada"
+        return None
+
+    _with_db(tmp_path, "edit-bad-id.db")(_body)
+
+
+@pytest.mark.parametrize("bad", [True, False, 1.0, "1", None])
+def test_set_child_active_non_int_id_rejected(tmp_path, bad) -> None:
+    async def _body(database):
+        child = await create_child(database, "Ada")
+        with pytest.raises(ValueError, match="child_id must be an integer"):
+            await set_child_active(database, bad, False)
+        assert (await list_children(database))[0].is_active is True
+        return None
+
+    _with_db(tmp_path, "set-active-bad-id.db")(_body)
+
+
+def test_edit_child_name_validation(tmp_path) -> None:
+    async def _body(database):
+        child = await create_child(database, "Ada")
+        for bad in ("", "   ", None, 42):
+            with pytest.raises(ValueError, match="display_name"):
+                await edit_child(database, child.id, display_name=bad)
+        # The failed edits left the record untouched.
+        assert (await list_children(database))[0].display_name == "Ada"
+        return None
+
+    _with_db(tmp_path, "edit-name-validation.db")(_body)
+
+
+def test_edit_child_sort_order_must_be_int(tmp_path) -> None:
+    async def _body(database):
+        child = await create_child(database, "Ada")
+        with pytest.raises(ValueError, match="sort_order must be an integer"):
+            await edit_child(database, child.id, sort_order="3")
+        return None
+
+    _with_db(tmp_path, "edit-bad-order.db")(_body)
+
+
+def test_edit_child_explicit_none_clear_rejected(tmp_path) -> None:
+    """Clearing is refused loudly, not silently ignored: the DAO cannot
+    express NULL writes, so an explicit None must never masquerade as a
+    no-op."""
+    async def _body(database):
+        child = await create_child(database, "Ada", colour="#111111")
+        with pytest.raises(ValueError, match="clearing colour"):
+            await edit_child(database, child.id, colour=None)
+        with pytest.raises(ValueError, match="clearing avatar_ref"):
+            await edit_child(database, child.id, avatar_ref=None)
+        # The refused clears left the colour intact.
+        assert (await list_children(database))[0].colour == "#111111"
+        return None
+
+    _with_db(tmp_path, "edit-clear-unsupported.db")(_body)
+
+
+def test_edit_child_rename_to_duplicate_warns_but_different_name_not(
+    tmp_path, caplog
+) -> None:
+    async def _body(database):
+        ada = await create_child(database, "Ada")
+        bo = await create_child(database, "Bo")
+        caplog.clear()
+        # Renaming Bo onto Ada's name warns (different child's name).
+        edited = await edit_child(database, bo.id, display_name="ada")
+        assert edited.display_name == "ada"
+        warnings = [
+            r for r in caplog.records if "duplicates existing child" in r.getMessage()
+        ]
+        assert len(warnings) == 1
+        assert "Ada" in warnings[0].getMessage()
+        return edited
+
+    _with_db(tmp_path, "edit-rename-duplicate.db")(_body)
+
+
+def test_edit_child_rename_to_own_name_casing_alone_warns_not(
+    tmp_path, caplog
+) -> None:
+    """Renaming a child to their own name (casing aside) is not a
+    duplicate when NO OTHER child carries the normalised name."""
+    async def _body(database):
+        ada = await create_child(database, "Ada")
+        caplog.clear()
+        edited = await edit_child(database, ada.id, display_name="ADA")
+        assert edited.display_name == "ADA"
+        assert not any(
+            "duplicates existing child" in r.getMessage()
+            for r in caplog.records
+        )
+        return edited
+
+    _with_db(tmp_path, "edit-rename-self.db")(_body)
+
+
+def test_create_child_concurrent_same_name_still_warns(tmp_path) -> None:
+    """Racing creates of the same normalised name cannot slip through
+    unlogged: the scan and INSERT are serialized on the connection
+    lock, so the second create sees the first's committed row and
+    warns.  Deterministic gate on task A's INSERT while task B queues
+    behind the lock.  Without the lock, B's scan would run before A's
+    INSERT commits and no warning would fire."""
+    async def _main():
+        armed = {"active": False, "gated": False}
+        gate_open = asyncio.Event()
+        a_started = asyncio.Event()
+        hass = _gated_hass(armed, gate_open, a_started)
+        database = NestQuestDatabase(hass)
+        await database.open(tmp_path / "create-race.db")
+        try:
+            await apply_migrations(database)
+            logger = logging.getLogger(
+                "custom_components.nestquest.children"
+            )
+            seen: list[logging.LogRecord] = []
+
+            class _Capture(logging.Handler):
+                def emit(self, record: logging.LogRecord) -> None:
+                    seen.append(record)
+
+            handler = _Capture()
+            logger.addHandler(handler)
+            try:
+                armed["active"] = True
+                task_a = asyncio.ensure_future(
+                    create_child(database, "Ada")
+                )
+                await a_started.wait()
+                armed["active"] = False
+                task_b = asyncio.ensure_future(
+                    create_child(database, " ada ")
+                )
+                await asyncio.sleep(0)
+                gate_open.set()
+                first, second = await asyncio.gather(task_a, task_b)
+            finally:
+                logger.removeHandler(handler)
+
+            # Both creates land; the duplicate is allowed.
+            assert first.display_name == "Ada"
+            assert second.display_name == "ada"
+            names = [c.display_name for c in await list_children(database)]
+            assert names == ["Ada", "ada"]
+            # Exactly one warning: B's scan saw A's committed row.
+            warnings = [
+                r for r in seen if "duplicates existing child" in r.getMessage()
+            ]
+            assert len(warnings) == 1, (
+                "the queued duplicate create must warn exactly once"
+            )
+            assert "Ada" in warnings[0].getMessage()
+        finally:
+            await database.close()
+
+    _run(_main())
+
+
+def test_edit_child_case_only_edit_colliding_with_other_child_warns(
+    tmp_path, caplog
+) -> None:
+    """A case-only edit must not hide a real duplicate: with two Ada
+    profiles already present, editing either one's name to another
+    casing still warns (the scan excludes only the edited child)."""
+    async def _body(database):
+        first = await create_child(database, "Ada")
+        await create_child(database, "ada")
+        caplog.clear()
+        edited = await edit_child(database, first.id, display_name="ADA")
+        assert edited.display_name == "ADA"
+        warnings = [
+            r for r in caplog.records if "duplicates existing child" in r.getMessage()
+        ]
+        assert len(warnings) == 1
+        # Editing the name to a value that STAYS duplicated (no change,
+        # other child still carries it) warns too: the scan is on the
+        # resulting state, not on whether the word moved.
+        caplog.clear()
+        await edit_child(database, first.id, display_name=" ada ")
+        warnings = [
+            r for r in caplog.records if "duplicates existing child" in r.getMessage()
+        ]
+        assert len(warnings) == 1
+        return None
+
+    _with_db(tmp_path, "edit-case-only-duplicate.db")(_body)
+
+
+# ---------------------------------------------------------------------------
+# set_child_active / list_children
+# ---------------------------------------------------------------------------
+
+
+def test_set_child_active_round_trip(tmp_path) -> None:
+    async def _body(database):
+        child = await create_child(database, "Ada")
+        deactivated = await set_child_active(database, child.id, False)
+        assert deactivated.is_active is False
+        assert [c.id for c in await list_children(database)] == [child.id]
+        assert await list_children(database, active_only=True) == []
+        reactivated = await set_child_active(database, child.id, True)
+        assert reactivated.is_active is True
+        assert len(await list_children(database, active_only=True)) == 1
+        return reactivated
+
+    _with_db(tmp_path, "set-active.db")(_body)
+
+
+def test_set_child_active_missing_raises(tmp_path) -> None:
+    async def _body(database):
+        with pytest.raises(ValueError, match="does not exist"):
+            await set_child_active(database, 999, False)
+        return None
+
+    _with_db(tmp_path, "set-active-missing.db")(_body)
+
+
+# ---------------------------------------------------------------------------
+# reorder_children: complete permutation or nothing changes
+# ---------------------------------------------------------------------------
+
+
+def test_reorder_children_persists_display_order(tmp_path) -> None:
+    async def _body(database):
+        first = await create_child(database, "Ada", sort_order=0)
+        second = await create_child(database, "Bo", sort_order=1)
+        third = await create_child(database, "Cleo", sort_order=2)
+        await reorder_children(database, [third.id, first.id, second.id])
+        # The active list returns children in the new sort order.
+        listed = await list_children(database, active_only=True)
+        assert [c.id for c in listed] == [third.id, first.id, second.id]
+        assert [c.sort_order for c in listed] == [0, 1, 2]
+        return listed
+
+    _with_db(tmp_path, "reorder-round-trip.db")(_body)
+
+
+def test_reorder_children_partial_list_rejected_order_unchanged(
+    tmp_path,
+) -> None:
+    async def _body(database):
+        first = await create_child(database, "Ada", sort_order=0)
+        second = await create_child(database, "Bo", sort_order=1)
+        third = await create_child(database, "Cleo", sort_order=2)
+        with pytest.raises(ValueError, match="missing child ids"):
+            await reorder_children(database, [third.id, first.id])
+        listed = await list_children(database)
+        # Nothing changed: rejection happens before any write.
+        assert [c.id for c in listed] == [first.id, second.id, third.id]
+        assert [c.sort_order for c in listed] == [0, 1, 2]
+        return listed
+
+    _with_db(tmp_path, "reorder-partial.db")(_body)
+
+
+def test_reorder_children_unknown_id_rejected_order_unchanged(
+    tmp_path,
+) -> None:
+    async def _body(database):
+        first = await create_child(database, "Ada", sort_order=0)
+        second = await create_child(database, "Bo", sort_order=1)
+        with pytest.raises(ValueError, match="unknown child ids"):
+            await reorder_children(database, [second.id, first.id, 999])
+        listed = await list_children(database)
+        assert [c.id for c in listed] == [first.id, second.id]
+        assert [c.sort_order for c in listed] == [0, 1]
+        return listed
+
+    _with_db(tmp_path, "reorder-unknown.db")(_body)
+
+
+def test_reorder_children_empty_list_rejected_when_children_exist(
+    tmp_path,
+) -> None:
+    """An empty list is the maximally partial reorder: rejected while
+    any child exists (against an empty table it is a complete
+    permutation and stays a harmless no-op)."""
+    async def _body(database):
+        first = await create_child(database, "Ada", sort_order=0)
+        with pytest.raises(ValueError, match="missing child ids"):
+            await reorder_children(database, [])
+        assert [c.sort_order for c in await list_children(database)] == [0]
+        return None
+
+    _with_db(tmp_path, "reorder-empty.db")(_body)
+
+
+def test_reorder_children_duplicate_and_non_int_rejected(tmp_path) -> None:
+    async def _body(database):
+        first = await create_child(database, "Ada", sort_order=0)
+        second = await create_child(database, "Bo", sort_order=1)
+        with pytest.raises(ValueError, match="duplicate child ids"):
+            await reorder_children(database, [first.id, first.id, second.id])
+        with pytest.raises(ValueError, match="child_id must be an integer"):
+            await reorder_children(database, [first.id, second.id, True])
+        with pytest.raises(ValueError, match="child_id must be an integer"):
+            await reorder_children(database, [first.id, second.id, "3"])
+        listed = await list_children(database)
+        assert [c.sort_order for c in listed] == [0, 1]
+        return listed
+
+    _with_db(tmp_path, "reorder-bad-inputs.db")(_body)
+
+
+def test_reorder_children_inactive_children_included(tmp_path) -> None:
+    """Inactive children keep their display position: the permutation
+    covers the whole table, not just the active list."""
+    async def _body(database):
+        first = await create_child(database, "Ada", sort_order=0)
+        second = await create_child(database, "Bo", sort_order=1)
+        await set_child_active(database, second.id, False)
+        # Both ids are required even though one is inactive.
+        await reorder_children(database, [second.id, first.id])
+        listed = await list_children(database)
+        assert [c.id for c in listed] == [second.id, first.id]
+        assert [c.sort_order for c in listed] == [0, 1]
+        # The active list skips the inactive child but keeps position.
+        assert [c.id for c in await list_children(database, active_only=True)] == [
+            first.id
+        ]
+        return listed
+
+    _with_db(tmp_path, "reorder-inactive.db")(_body)
+
+
+@pytest.mark.parametrize("bad", ["1", "0", 1, 0, 1.0, None, "true"])
+def test_set_child_active_rejects_non_bool(tmp_path, bad) -> None:
+    """The DAO's int() would silently coerce "1"/0/1.0 into a state the
+    caller never asked for; the business layer refuses non-bools."""
+    async def _body(database):
+        child = await create_child(database, "Ada")
+        with pytest.raises(ValueError, match="is_active must be a real bool"):
+            await set_child_active(database, child.id, bad)
+        # The refused transition left the child untouched.
+        assert (await list_children(database))[0].is_active is True
+        return None
+
+    _with_db(tmp_path, "set-active-non-bool.db")(_body)
+
+
+# ---------------------------------------------------------------------------
+# Concurrency: edit/set_active are atomic under the connection lock
+# ---------------------------------------------------------------------------
+
+
+def _gated_hass(armed: dict, gate_open: asyncio.Event, a_started: asyncio.Event):
+    """A hass mock whose executor gates the FIRST `_execute` job after
+    arming — the mutate statement of whichever business call starts
+    first — proving the caller holds the connection lock at that
+    moment and the second caller must queue behind it."""
+    from unittest.mock import MagicMock
+
+    hass = MagicMock()
+
+    async def _gated_executor(fn, *args):
+        if armed["active"]:
+            if getattr(fn, "__name__", "") == "_execute" and not armed["gated"]:
+                armed["gated"] = True
+                a_started.set()
+                await gate_open.wait()
+        return fn(*args)
+
+    hass.async_add_executor_job = _gated_executor
+    return hass
+
+
+def test_edit_child_concurrent_opposite_edits_return_own_values(
+    tmp_path,
+) -> None:
+    """Two racing edits cannot cross-contaminate each other's readback.
+
+    Deterministic gate: task A is paused at its UPDATE (it provably
+    holds the connection lock), task B is then created and must queue;
+    A's readback runs before B's edit, so A returns A's value and B
+    returns B's.  Without the lock, A's readback would see B's write.
+    """
+    async def _main():
+        armed = {"active": False, "gated": False}
+        gate_open = asyncio.Event()
+        a_started = asyncio.Event()
+        hass = _gated_hass(armed, gate_open, a_started)
+        database = NestQuestDatabase(hass)
+        await database.open(tmp_path / "edit-race.db")
+        try:
+            await apply_migrations(database)
+            child = await create_child(
+                database, "Ada", colour="#111111", sort_order=0
+            )
+
+            armed["active"] = True
+            task_a = asyncio.ensure_future(
+                edit_child(database, child.id, colour="#AAAAAA", sort_order=1)
+            )
+            await a_started.wait()
+            armed["active"] = False
+            task_b = asyncio.ensure_future(
+                edit_child(
+                    database, child.id, colour="#BBBBBB", sort_order=2
+                )
+            )
+            await asyncio.sleep(0)
+            gate_open.set()
+            record_a, record_b = await asyncio.gather(task_a, task_b)
+
+            # Each caller gets back exactly what it wrote.
+            assert record_a.colour == "#AAAAAA"
+            assert record_a.sort_order == 1
+            assert record_b.colour == "#BBBBBB"
+            assert record_b.sort_order == 2
+            # B landed last: the stored row is B's (read via the DAO —
+            # the children leak guard forbids raw probes here).
+            stored = await ChildrenDao(database).get(child.id)
+            assert stored is not None
+            assert (stored.colour, stored.sort_order) == ("#BBBBBB", 2)
+        finally:
+            await database.close()
+
+    _run(_main())
+
+
+def test_set_child_active_concurrent_opposite_transitions_return_own(
+    tmp_path,
+) -> None:
+    """Racing activate/deactivate calls each report their own request.
+
+    Same deterministic gate on task A's UPDATE; task B queues behind
+    the connection lock and lands the opposite transition after A.
+    """
+    async def _main():
+        armed = {"active": False, "gated": False}
+        gate_open = asyncio.Event()
+        a_started = asyncio.Event()
+        hass = _gated_hass(armed, gate_open, a_started)
+        database = NestQuestDatabase(hass)
+        await database.open(tmp_path / "active-race.db")
+        try:
+            await apply_migrations(database)
+            child = await create_child(database, "Ada")
+
+            armed["active"] = True
+            task_a = asyncio.ensure_future(
+                set_child_active(database, child.id, False)
+            )
+            await a_started.wait()
+            armed["active"] = False
+            task_b = asyncio.ensure_future(
+                set_child_active(database, child.id, True)
+            )
+            await asyncio.sleep(0)
+            gate_open.set()
+            record_a, record_b = await asyncio.gather(task_a, task_b)
+
+            assert record_a.is_active is False
+            assert record_b.is_active is True
+            stored = await ChildrenDao(database).get(child.id)
+            assert stored is not None
+            assert stored.is_active is True
+        finally:
+            await database.close()
+
+    _run(_main())
+
+
+def test_list_children_orders_by_sort_order_then_id(tmp_path) -> None:
+    async def _body(database):
+        second = await create_child(database, "Bo", sort_order=1)
+        first = await create_child(database, "Ada", sort_order=0)
+        third = await create_child(database, "Cleo", sort_order=1)
+        listed = await list_children(database)
+        # sort_order 0 first, then the two sort_order-1 rows by id.
+        assert [c.id for c in listed] == [first.id, second.id, third.id]
+        return listed
+
+    _with_db(tmp_path, "list-order.db")(_body)
+
+
+# ---------------------------------------------------------------------------
+# Deactivation keeps every referencing row intact (Feature 03)
+# ---------------------------------------------------------------------------
+
+
+def test_deactivating_child_preserves_definitions_instances_events(
+    tmp_path,
+) -> None:
+    async def _body(database):
+        from datetime import date, timedelta
+
+        from custom_components.nestquest.dao_children import ChildrenDao
+        from custom_components.nestquest.dao_instances import (
+            CompletionEventsDao,
+            QuestInstancesDao,
+        )
+        from custom_components.nestquest.dao_rules import (
+            QuestDefinitionsDao,
+            ScheduleRulesDao,
+        )
+
+        children = ChildrenDao(database)
+        rules = ScheduleRulesDao(database)
+        definitions = QuestDefinitionsDao(database)
+        instances = QuestInstancesDao(database)
+        events = CompletionEventsDao(database)
+
+        child = await create_child(database, "Ada")
+        rule = await rules.create("daily", "2026-01-01")
+        definition = await definitions.create(
+            "Brush teeth",
+            rule.id,
+            "2026-09-15T12:00:00+00:00",
+            assignee_child_ids=[child.id],
+        )
+        due = (date.today() + timedelta(days=1)).isoformat()
+        stamp = f"{due}T08:00:00+00:00"
+        instance = await instances.upsert(
+            definition.id, child.id, due, stamp, window="morning"
+        )
+        event = await events.append(
+            instance.id,
+            child.id,
+            "completed",
+            "panel",
+            f"{due}T09:00:00+00:00",
+            True,
+            actor_child_id=child.id,
+        )
+
+        # Deactivate: the referencing rows must not move.
+        deactivated = await set_child_active(database, child.id, False)
+        assert deactivated.is_active is False
+        assert await children.get(child.id) == deactivated
+        assert (await definitions.get(definition.id)) == definition
+        assert (await instances.get_by_id(instance.id)) == instance
+        assert await events.list_by_instance(instance.id) == [event]
+        # Excluded from the active list, still present in the full list.
+        assert await list_children(database, active_only=True) == []
+        assert [c.id for c in await list_children(database)] == [child.id]
+
+        # Reactivate: fully restored.
+        reactivated = await set_child_active(database, child.id, True)
+        assert reactivated.is_active is True
+        assert [c.id for c in await list_children(database, active_only=True)] == [
+            child.id
+        ]
+        assert (await instances.get_by_id(instance.id)) == instance
+        return reactivated
+
+    _with_db(tmp_path, "deactivate-data-intact.db")(_body)
+
+
+def test_no_code_path_deletes_a_child_row() -> None:
+    """Structural guardrail: children are deactivated, never deleted.
+
+    The DAO exposes no delete method at all, and no module in the
+    package (nor any test outside the sanctioned DDL/migration layers,
+    which create the tables) carries a statement that removes child
+    rows — the leak guard in test_dao_children enforces the file
+    allowlist, this asserts the no-delete property itself across every
+    file that may legitimately name the table.
+    """
+    import re
+    from pathlib import Path
+
+    package = Path(
+        __import__(
+            "custom_components.nestquest", fromlist=["__file__"]
+        ).__file__
+    ).parent
+
+    delete_pattern = re.compile(
+        r"DELETE\s+(FROM\s+)?((main|temp)\s*\.\s*)?[`'\"]*(\[)?children\b",
+        re.IGNORECASE,
+    )
+    for py in sorted(package.rglob("*.py")):
+        assert delete_pattern.search(py.read_text()) is None, (
+            f"a code path in {py.name} deletes child rows"
+        )
+
+    import inspect
+
+    from custom_components.nestquest.dao_children import ChildrenDao
+
+    methods = {
+        name
+        for name, _ in inspect.getmembers(ChildrenDao, inspect.isfunction)
+    }
+    assert not any(
+        name.startswith("delete") or name == "remove" for name in methods
+    ), f"ChildrenDao exposed a delete-shaped method: {methods}"

tests/test_completion.py

@@ -0,0 +1,446 @@
+"""Tests for completion.py: the Feature 08 append-only business layer."""
+from __future__ import annotations
+
+import asyncio
+import datetime
+import inspect
+import re
+
+import pytest
+
+from custom_components.nestquest.completion import append_event, instance_state
+from custom_components.nestquest.dao_children import ChildrenDao
+from custom_components.nestquest.dao_instances import (
+    EVENT_COMPLETED,
+    EVENT_UNCOMPLETED,
+    CompletionEventRecord,
+    CompletionEventsDao,
+    QuestInstancesDao,
+)
+from custom_components.nestquest.dao_rules import (
+    QuestDefinitionsDao,
+    ScheduleRulesDao,
+)
+from custom_components.nestquest.db import NestQuestDatabase
+from custom_components.nestquest.migrations import apply_migrations
+
+
+def _run(coro):
+    return asyncio.new_event_loop().run_until_complete(coro)
+
+
+def _make_hass_mock():
+    from unittest.mock import AsyncMock, MagicMock
+
+    hass = MagicMock()
+    hass.async_add_executor_job = AsyncMock(side_effect=(lambda fn, *a: fn(*a)))
+    return hass
+
+
+def _today_iso() -> str:
+    return datetime.date.today().isoformat()
+
+
+def _now_stamp() -> str:
+    return f"{_today_iso()}T08:00:00+00:00"
+
+
+def _future_day(offset: int) -> str:
+    return (
+        datetime.date.today() + datetime.timedelta(days=offset)
+    ).isoformat()
+
+
+D1 = _future_day(1)
+
+
+async def _prepare(path) -> tuple:
+    database = NestQuestDatabase(_make_hass_mock())
+    await database.open(path)
+    await apply_migrations(database)
+    children = ChildrenDao(database)
+    rules = ScheduleRulesDao(database)
+    definitions = QuestDefinitionsDao(database)
+    instances = QuestInstancesDao(database)
+    child = await children.create("Ada", _now_stamp())
+    rule = await rules.create("daily", D1)
+    definition = await definitions.create(
+        "Brush teeth", rule.id, _now_stamp(), assignee_child_ids=[child.id]
+    )
+    instance = await instances.upsert(
+        definition.id, child.id, D1, _now_stamp(), window="morning"
+    )
+    return database, child, instance
+
+
+def _with_db(tmp_path, name):
+    def _run_test(body):
+        async def _main():
+            prepared = await _prepare(tmp_path / name)
+            try:
+                return await body(*prepared)
+            finally:
+                await prepared[0].close()
+
+        return _run(_main())
+
+    return _run_test
+
+
+# ---------------------------------------------------------------------------
+# inverted actor shapes: field-naming ValueErrors, no write
+# ---------------------------------------------------------------------------
+
+
+def test_user_without_actor_user_id_rejected() -> None:
+    async def _body():
+        with pytest.raises(ValueError, match="actor_user_id"):
+            await append_event(
+                object(),
+                1,
+                1,
+                EVENT_COMPLETED,
+                actor_source="user",
+                was_on_time=True,
+            )
+        with pytest.raises(ValueError, match="actor_user_id"):
+            await append_event(
+                object(),
+                1,
+                1,
+                EVENT_COMPLETED,
+                actor_source="user",
+                actor_user_id=None,
+                was_on_time=True,
+            )
+        with pytest.raises(ValueError, match="actor_user_id"):
+            await append_event(
+                object(),
+                1,
+                1,
+                EVENT_COMPLETED,
+                actor_source="user",
+                actor_user_id="",
+                was_on_time=True,
+            )
+
+    _run(_body())
+
+
+def test_user_must_not_carry_actor_child_id() -> None:
+    async def _body():
+        with pytest.raises(ValueError, match="actor_child_id"):
+            await append_event(
+                object(),
+                1,
+                1,
+                EVENT_COMPLETED,
+                actor_source="user",
+                actor_user_id="user-1",
+                actor_child_id=1,
+                was_on_time=True,
+            )
+
+    _run(_body())
+
+
+def test_panel_must_not_carry_actor_user_id() -> None:
+    async def _body():
+        with pytest.raises(ValueError, match="actor_user_id"):
+            await append_event(
+                object(),
+                1,
+                1,
+                EVENT_COMPLETED,
+                actor_source="panel",
+                actor_user_id="user-1",
+                actor_child_id=1,
+                was_on_time=True,
+            )
+
+    _run(_body())
+
+
+def test_panel_requires_actor_child_id() -> None:
+    async def _body():
+        with pytest.raises(ValueError, match="actor_child_id"):
+            await append_event(
+                object(),
+                1,
+                1,
+                EVENT_COMPLETED,
+                actor_source="panel",
+                was_on_time=True,
+            )
+
+    _run(_body())
+
+
+def test_actor_source_service_rejected() -> None:
+    async def _body():
+        with pytest.raises(ValueError, match="actor_source"):
+            await append_event(
+                object(),
+                1,
+                1,
+                EVENT_COMPLETED,
+                actor_source="service",
+                actor_user_id="user-1",
+                was_on_time=True,
+            )
+
+    _run(_body())
+
+
+def test_completed_requires_was_on_time() -> None:
+    async def _body():
+        with pytest.raises(ValueError, match="was_on_time"):
+            await append_event(
+                object(),
+                1,
+                1,
+                EVENT_COMPLETED,
+                actor_source="user",
+                actor_user_id="user-1",
+            )
+
+    _run(_body())
+
+
+# ---------------------------------------------------------------------------
+# happy paths
+# ---------------------------------------------------------------------------
+
+
+def test_user_append_round_trips(tmp_path) -> None:
+    async def _body(database, child, instance):
+        event = await append_event(
+            database,
+            instance.id,
+            child.id,
+            EVENT_COMPLETED,
+            actor_source="user",
+            actor_user_id="user-1",
+            was_on_time=True,
+        )
+        assert isinstance(event, CompletionEventRecord)
+        assert event.event_type == EVENT_COMPLETED
+        assert event.actor_source == "user"
+        assert event.actor_user_id == "user-1"
+        assert event.actor_child_id is None
+        assert event.was_on_time is True
+        assert re.fullmatch(
+            r"\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\+00:00", event.occurred_at
+        )
+        return event
+
+    _with_db(tmp_path, "user-append.db")(_body)
+
+
+def test_panel_append_round_trips(tmp_path) -> None:
+    async def _body(database, child, instance):
+        event = await append_event(
+            database,
+            instance.id,
+            child.id,
+            EVENT_COMPLETED,
+            actor_source="panel",
+            actor_child_id=child.id,
+            was_on_time=False,
+        )
+        assert event.actor_source == "panel"
+        assert event.actor_user_id is None
+        assert event.actor_child_id == child.id
+        assert event.was_on_time is False
+        assert re.fullmatch(
+            r"\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\+00:00", event.occurred_at
+        )
+        return event
+
+    _with_db(tmp_path, "panel-append.db")(_body)
+
+
+def test_uncompleted_allows_null_was_on_time(tmp_path) -> None:
+    async def _body(database, child, instance):
+        event = await append_event(
+            database,
+            instance.id,
+            child.id,
+            EVENT_UNCOMPLETED,
+            actor_source="user",
+            actor_user_id="user-1",
+            was_on_time=None,
+        )
+        assert event.event_type == EVENT_UNCOMPLETED
+        assert event.was_on_time is None
+        return event
+
+    _with_db(tmp_path, "uncompleted-null.db")(_body)
+
+
+def test_now_pins_occurred_at_utc(tmp_path) -> None:
+    async def _body(database, child, instance):
+        pinned = datetime.datetime(
+            2026, 9, 18, 8, 0, 0, tzinfo=datetime.timezone.utc
+        )
+        event = await append_event(
+            database,
+            instance.id,
+            child.id,
+            EVENT_COMPLETED,
+            actor_source="user",
+            actor_user_id="user-1",
+            was_on_time=True,
+            now=pinned,
+        )
+        assert event.occurred_at == "2026-09-18T08:00:00+00:00"
+        return event
+
+    _with_db(tmp_path, "pinned-now.db")(_body)
+
+
+# ---------------------------------------------------------------------------
+# append-only: the module never exposes update/delete
+# ---------------------------------------------------------------------------
+
+
+def test_module_never_exposes_update_or_delete() -> None:
+    import custom_components.nestquest.completion as completion
+
+    public = {
+        name
+        for name, _ in inspect.getmembers(completion, inspect.isfunction)
+        if not name.startswith("_")
+    }
+    forbidden = {
+        name
+        for name in public
+        if name.startswith(
+            (
+                "update",
+                "delete",
+                "set",
+                "clear",
+                "remove",
+                "modify",
+                "edit",
+                "upsert",
+            )
+        )
+    }
+    assert forbidden == set(), (
+        f"completion.py exposed mutation methods: {forbidden}"
+    )
+    assert "append_event" in public
+    assert "instance_state" in public
+    assert "complete_instance" not in public
+    assert "uncomplete_instance" not in public
+    source = inspect.getsource(completion)
+    assert "UPDATE" not in source
+    assert "DELETE" not in source
+    assert "INSERT" not in source
+
+
+# ---------------------------------------------------------------------------
+# instance_state: derived from the latest event
+# ---------------------------------------------------------------------------
+
+
+def test_instance_state_open_when_no_events(tmp_path) -> None:
+    async def _body(database, child, instance):
+        assert await instance_state(database, instance.id) == "open"
+
+    _with_db(tmp_path, "state-none.db")(_body)
+
+
+def test_instance_state_open_when_latest_uncompleted(tmp_path) -> None:
+    async def _body(database, child, instance):
+        await append_event(
+            database,
+            instance.id,
+            child.id,
+            EVENT_COMPLETED,
+            actor_source="user",
+            actor_user_id="user-1",
+            was_on_time=True,
+        )
+        await append_event(
+            database,
+            instance.id,
+            child.id,
+            EVENT_UNCOMPLETED,
+            actor_source="user",
+            actor_user_id="user-1",
+        )
+        assert await instance_state(database, instance.id) == "open"
+
+    _with_db(tmp_path, "state-uncompleted.db")(_body)
+
+
+def test_instance_state_unknown_instance_id_raises(tmp_path) -> None:
+    async def _body(database, child, instance):
+        with pytest.raises(ValueError, match="instance_id"):
+            await instance_state(database, instance.id + 999)
+
+    _with_db(tmp_path, "state-unknown.db")(_body)
+
+
+def test_instance_state_rejects_non_integer_id() -> None:
+    async def _body():
+        with pytest.raises(ValueError, match="instance_id"):
+            await instance_state(object(), "1")
+        with pytest.raises(ValueError, match="instance_id"):
+            await instance_state(object(), True)
+
+    _run(_body())
+
+
+def test_instance_state_three_events_returns_done_and_preserves_rows(
+    tmp_path,
+) -> None:
+    async def _body(database, child, instance):
+        base = datetime.datetime(
+            2026, 9, 18, 8, 0, 0, tzinfo=datetime.timezone.utc
+        )
+        await append_event(
+            database,
+            instance.id,
+            child.id,
+            EVENT_COMPLETED,
+            actor_source="user",
+            actor_user_id="user-1",
+            was_on_time=True,
+            now=base,
+        )
+        await append_event(
+            database,
+            instance.id,
+            child.id,
+            EVENT_UNCOMPLETED,
+            actor_source="user",
+            actor_user_id="user-1",
+            now=base + datetime.timedelta(seconds=1),
+        )
+        await append_event(
+            database,
+            instance.id,
+            child.id,
+            EVENT_COMPLETED,
+            actor_source="user",
+            actor_user_id="user-1",
+            was_on_time=False,
+            now=base + datetime.timedelta(seconds=2),
+        )
+        events = CompletionEventsDao(database)
+        before = await events.list_by_instance(instance.id)
+        assert [e.event_type for e in before] == [
+            EVENT_COMPLETED,
+            EVENT_UNCOMPLETED,
+            EVENT_COMPLETED,
+        ]
+        assert await instance_state(database, instance.id) == "done"
+        after = await events.list_by_instance(instance.id)
+        assert after == before
+        assert len(after) == 3
+
+    _with_db(tmp_path, "state-three.db")(_body)

tests/test_config_flow.py

@@ -154,4 +154,25 @@ def test_no_hardcoded_domain_or_db_filename_in_new_modules() -> None:
                     )
                 assert node.value != "nestquest.db", (
                     f"Found hard-coded database filename in {py_file.name}:{node.lineno}"
-                )
+                )
+
+async def test_flow_persists_flow_user_as_initial_admin(hass, make_flow) -> None:
+    """The HA user completing the flow lands in entry data as the
+    initial admin copy: entry.context is not persisted by real HA, so
+    the durable record must carry the owner."""
+    from custom_components.nestquest.const import CONF_ADMIN_USER_IDS
+
+    flow = make_flow(hass)
+    flow.context = {"user_id": "ha-owner"}
+    result = await flow.async_step_user({})
+    assert result["type"] == "create_entry"
+    assert result["data"] == {CONF_ADMIN_USER_IDS: ["ha-owner"]}
+
+
+async def test_flow_without_context_user_keeps_data_untouched(
+    hass, make_flow
+) -> None:
+    flow = make_flow(hass)
+    result = await flow.async_step_user({"horizon_days": 7})
+    assert result["type"] == "create_entry"
+    assert result["data"] == {"horizon_days": 7}

tests/test_const.py

@@ -73,6 +73,36 @@ def test_panel_idle_timeout_config() -> None:
     assert const.DEFAULT_PANEL_IDLE_TIMEOUT > 0
 
 
+def test_quest_windows_canonical_order() -> None:
+    """QUEST_WINDOWS is exactly the three spellings in canonical order."""
+    assert const.QUEST_WINDOWS == ("morning", "afternoon", "evening")
+    assert const.WINDOW_MORNING == "morning"
+    assert const.WINDOW_AFTERNOON == "afternoon"
+    assert const.WINDOW_EVENING == "evening"
+    # No duplicates, every name covered by its individual constant.
+    assert len(set(const.QUEST_WINDOWS)) == 3
+
+
+def test_window_clock_ranges_cover_every_window() -> None:
+    """Each window has a strict HH:MM (start, end) range.
+
+    The ranges follow the documented boundaries (D-008): morning ends
+    11:59, afternoon spans 12:00-17:00, evening 17:00-21:00, and each
+    window's end equals the next window's start (the boundary belongs
+    to the later window at classification time).
+    """
+    assert const.WINDOW_CLOCK_RANGES == {
+        "morning": ("00:00", "11:59"),
+        "afternoon": ("12:00", "17:00"),
+        "evening": ("17:00", "21:00"),
+    }
+    for window in const.QUEST_WINDOWS:
+        start, end = const.WINDOW_CLOCK_RANGES[window]
+        for value in (start, end):
+            parsed = datetime.strptime(value, "%H:%M").time()
+            assert parsed.strftime("%H:%M") == value
+
+
 def test_no_hardcoded_domain_or_db_filename_in_modules() -> None:
     """Ensure no module other than const.py hardcodes DOMAIN string or SQLITE_DB_FILENAME."""
     pkg_dir = Path(const.__file__).parent

tests/test_dao_children.py

@@ -227,24 +227,34 @@ def test_reorder_is_transactional_and_idempotent(tmp_path) -> None:
         _run(database.close())
 
 
-def test_reorder_empty_list_is_noop(tmp_path) -> None:
+def test_reorder_empty_list_is_rejected(tmp_path) -> None:
+    """An empty list is the maximally partial reorder: rejected while
+    any child exists (Feature 03 reorder contract)."""
+    import pytest as pytest_module
+
     database = _open_db(tmp_path / "reorder-empty.db")
     try:
         dao, _ = _daos(database)
         _make_child(dao, "Ada")
-        _run(dao.reorder([]))
+        with pytest_module.raises(ValueError, match="missing child ids"):
+            _run(dao.reorder([]))
         children = _run(dao.list_all())
         assert children[0].sort_order == 0
     finally:
         _run(database.close())
 
 
-def test_reorder_unknown_id_leaves_it_untouched(tmp_path) -> None:
+def test_reorder_unknown_id_is_rejected(tmp_path) -> None:
+    """An unknown id is rejected before any write; the order is
+    untouched (Feature 03 reorder contract)."""
+    import pytest as pytest_module
+
     database = _open_db(tmp_path / "reorder-unknown.db")
     try:
         dao, _ = _daos(database)
         a = _make_child(dao, "Ada")
-        _run(dao.reorder([a.id, 999]))
+        with pytest_module.raises(ValueError, match="unknown child ids"):
+            _run(dao.reorder([a.id, 999]))
         children = _run(dao.list_all())
         assert children[0].sort_order == 0
     finally:

tests/test_dao_instances.py

@@ -82,7 +82,7 @@ async def _prepare(path) -> tuple:
     child = await children.create("Ada", _now_stamp())
     rule = await rules.create("daily", D1)
     definition = await definitions.create(
-        "Brush teeth", child.id, rule.id, _now_stamp()
+        "Brush teeth", rule.id, _now_stamp(), assignee_child_ids=[child.id]
     )
     return (
         database,
@@ -119,12 +119,10 @@ def test_upsert_creates_then_is_idempotent(tmp_path) -> None:
     async def _body(database, children, rules, definitions, instances,
                     events, child, definition):
         first = await instances.upsert(
-            definition.id, child.id, D1, _now_stamp()
-        )
+            definition.id, child.id, D1, _now_stamp(), window="morning")
         assert isinstance(first, QuestInstanceRecord)
         second = await instances.upsert(
-            definition.id, child.id, D1, _now_stamp()
-        )
+            definition.id, child.id, D1, _now_stamp(), window="morning")
         assert second.id == first.id
         rows = await database.fetch_one(
             "SELECT COUNT(*) FROM quest_instances"
@@ -138,27 +136,116 @@ def test_upsert_creates_then_is_idempotent(tmp_path) -> None:
 def test_upsert_different_dates_create_distinct_rows(tmp_path) -> None:
     async def _body(database, children, rules, definitions, instances,
                     events, child, definition):
-        a = await instances.upsert(definition.id, child.id, D1, _now_stamp())
-        b = await instances.upsert(definition.id, child.id, D2, _now_stamp())
+        a = await instances.upsert(definition.id, child.id, D1, _now_stamp(), window="morning")
+        b = await instances.upsert(definition.id, child.id, D2, _now_stamp(), window="morning")
         assert a.id != b.id
         return (a, b)
 
     _with_db(tmp_path, "upsert-multi-date.db")(_body)
 
 
+def test_upsert_twice_daily_fanout_two_windows_two_rows(tmp_path) -> None:
+    """D-008 twice-daily case: one definition, one child, one date,
+    two windows — two rows, each idempotent on its own tuple."""
+    async def _body(database, children, rules, definitions, instances,
+                    events, child, definition):
+        morning = await instances.upsert(
+            definition.id, child.id, D1, _now_stamp(), window="morning"
+        )
+        evening = await instances.upsert(
+            definition.id, child.id, D1, _now_stamp(), window="evening"
+        )
+        assert morning.id != evening.id
+        rows = await database.fetch_all(
+            "SELECT window, child_id, due_date FROM quest_instances "
+            "WHERE definition_id = ? AND due_date = ?",
+            (definition.id, D1),
+        )
+        assert sorted(rows) == [
+            ("evening", child.id, D1),
+            ("morning", child.id, D1),
+        ]
+        # Re-running both is still idempotent.
+        await instances.upsert(
+            definition.id, child.id, D1, _now_stamp(), window="morning"
+        )
+        await instances.upsert(
+            definition.id, child.id, D1, _now_stamp(), window="evening"
+        )
+        count = await database.fetch_one(
+            "SELECT COUNT(*) FROM quest_instances"
+        )
+        assert count == (2,)
+        return (morning, evening)
+
+    _with_db(tmp_path, "upsert-twice-daily.db")(_body)
+
+
+def test_upsert_shared_definition_three_assignees_three_rows(
+    tmp_path,
+) -> None:
+    """D-008 shared case: one definition, three assignees, one window
+    — three rows, one per child."""
+    async def _body(database, children, rules, definitions, instances,
+                    events, child, definition):
+        second = await children.create("Bo", _now_stamp())
+        third = await children.create("Cleo", _now_stamp())
+        await definitions.add_assignee(definition.id, second.id)
+        await definitions.add_assignee(definition.id, third.id)
+        created = [
+            await instances.upsert(
+                definition.id, assignee.id, D1, _now_stamp(),
+                window="morning",
+            )
+            for assignee in (child, second, third)
+        ]
+        assert len({row.id for row in created}) == 3
+        count = await database.fetch_one(
+            "SELECT COUNT(*) FROM quest_instances "
+            "WHERE definition_id = ? AND due_date = ? AND window = ?",
+            (definition.id, D1, "morning"),
+        )
+        assert count == (3,)
+        # Re-running the fan-out changes nothing.
+        for assignee in (child, second, third):
+            await instances.upsert(
+                definition.id, assignee.id, D1, _now_stamp(),
+                window="morning",
+            )
+        count = await database.fetch_one(
+            "SELECT COUNT(*) FROM quest_instances"
+        )
+        assert count == (3,)
+        return created
+
+    _with_db(tmp_path, "upsert-shared-fanout.db")(_body)
+
+
+def test_upsert_window_outside_const_list_raises(tmp_path) -> None:
+    """The DAO rejects a window spelling the schema CHECK would reject
+    anyway, with the typed ValueError instead of raw IntegrityError."""
+    async def _body(database, children, rules, definitions, instances,
+                    events, child, definition):
+        with pytest.raises(ValueError, match="window must be one of"):
+            await instances.upsert(
+                definition.id, child.id, D1, _now_stamp(), window="noon"
+            )
+        return None
+
+    _with_db(tmp_path, "upsert-bad-window.db")(_body)
+
+
 def test_upsert_refreshes_snapshot_columns_on_conflict(tmp_path) -> None:
     async def _body(database, children, rules, definitions, instances,
                     events, child, definition):
         first = await instances.upsert(
-            definition.id, child.id, D1, _now_stamp(), due_time="08:00"
-        )
+            definition.id, child.id, D1, _now_stamp(), due_time="08:00", window="morning")
         second = await instances.upsert(
             definition.id,
             child.id,
             D1,
             f"{D1}T13:00:00+00:00",
-            due_time="08:30",
-        )
+            due_time="08:30", window="morning")
         assert second.id == first.id
         assert second.due_time == "08:30"
         assert second.generated_at == f"{D1}T13:00:00+00:00"
@@ -172,7 +259,7 @@ def test_upsert_rejects_wrong_child_for_definition(tmp_path) -> None:
                     events, child, definition):
         other = await children.create("Bo", _now_stamp())
         with pytest.raises(ValueError, match="assigned to"):
-            await instances.upsert(definition.id, other.id, D1, _now_stamp())
+            await instances.upsert(definition.id, other.id, D1, _now_stamp(), window="morning")
         return None
 
     _with_db(tmp_path, "upsert-wrong-child.db")(_body)
@@ -182,20 +269,18 @@ def test_upsert_rejects_unknown_definition_and_child(tmp_path) -> None:
     async def _body(database, children, rules, definitions, instances,
                     events, child, definition):
         with pytest.raises(ValueError, match="definition 999"):
-            await instances.upsert(999, child.id, D1, _now_stamp())
+            await instances.upsert(999, child.id, D1, _now_stamp(), window="morning")
         # Unknown child: the definition-assignee check fires first and
-        # is the one that matters (an instance must carry its
-        # definition's assignee).  To reach the child-existence check
-        # at all, the definition would have to claim child 999 — an
-        # FK-impossible state — so the child check only guards direct
-        # callers with a matching fake assignee; assert the guard
-        # order instead of forcing the FK-impossible state.
+        # is the one that matters (an instance must carry an assigned
+        # child).  Under D-008 the assignee check is a membership test
+        # against quest_definition_assignees, so child 999 simply is
+        # not an assignee — the error names the pair.
         rule = await rules.create("daily", D1)
         other_definition = await definitions.create(
-            "X", child.id, rule.id, _now_stamp()
+            "X", rule.id, _now_stamp(), assignee_child_ids=[child.id]
         )
-        with pytest.raises(ValueError, match="not 999"):
-            await instances.upsert(other_definition.id, 999, D1, _now_stamp())
+        with pytest.raises(ValueError, match="not assigned to child 999"):
+            await instances.upsert(other_definition.id, 999, D1, _now_stamp(), window="morning")
         return None
 
     _with_db(tmp_path, "upsert-unknown.db")(_body)
@@ -206,7 +291,7 @@ def test_upsert_malformed_due_date_raises(tmp_path) -> None:
                     events, child, definition):
         for bad in ("not-a-date", "2026-9-15", ""):
             with pytest.raises(ValueError, match="YYYY-MM-DD"):
-                await instances.upsert(definition.id, child.id, bad, _now_stamp())
+                await instances.upsert(definition.id, child.id, bad, _now_stamp(), window="morning")
         return None
 
     _with_db(tmp_path, "upsert-bad-date.db")(_body)
@@ -218,11 +303,11 @@ def test_upsert_rejects_past_due_dates(tmp_path) -> None:
                     events, child, definition):
         yesterday = _future_day(-1)
         with pytest.raises(ValueError, match="never generated in the past"):
-            await instances.upsert(definition.id, child.id, yesterday, _now_stamp())
+            await instances.upsert(definition.id, child.id, yesterday, _now_stamp(), window="morning")
         # Today itself is allowed (the rollover job generates today's
         # instances before the day is over).
         today = datetime.date.today().isoformat()
-        record = await instances.upsert(definition.id, child.id, today, _now_stamp())
+        record = await instances.upsert(definition.id, child.id, today, _now_stamp(), window="morning")
         assert record.due_date == today
         return record
 
@@ -298,7 +383,7 @@ def test_upsert_no_past_check_uses_execution_date_not_call_date(
             await asyncio.wait_for(holder_inside.wait(), timeout=5)
 
             task = asyncio.ensure_future(
-                instances.upsert(definition.id, child.id, today, _now_stamp())
+                instances.upsert(definition.id, child.id, today, _now_stamp(), window="morning")
             )
             # A is now queued on the connection lock (it cannot pass
             # its in-lock check while B holds the lock).  Shift the
@@ -329,7 +414,10 @@ def test_upsert_no_past_check_uses_execution_date_not_call_date(
             child = await children.create("Ada", _now_stamp())
             rule = await rules.create("daily", D1)
             definition = await definitions.create(
-                "Brush teeth", child.id, rule.id, _now_stamp()
+                "Brush teeth",
+                rule.id,
+                _now_stamp(),
+                assignee_child_ids=[child.id],
             )
             return await _body(
                 database, children, rules, definitions, instances,
@@ -348,17 +436,15 @@ def test_upsert_refuses_immutable_completed_instance(tmp_path) -> None:
                     events, child, definition):
         generated_at = _now_stamp()
         instance = await instances.upsert(
-            definition.id, child.id, D1, generated_at, due_time="08:00"
-        )
+            definition.id, child.id, D1, generated_at, due_time="08:00", window="morning")
         await events.append(
             instance.id, child.id, "completed", "user", _now_stamp(), True,
             actor_user_id="user-1",
         )
         with pytest.raises(ValueError, match="immutable"):
             await instances.upsert(
-                definition.id, child.id, D1, _now_stamp(), due_time="09:00"
-            )
-        fetched = await instances.get(definition.id, D1)
+                definition.id, child.id, D1, _now_stamp(), due_time="09:00", window="morning")
+        fetched = await instances.get(definition.id, child.id, D1, "morning")
         assert fetched.due_time == "08:00", (
             "failed regeneration must not touch the completed instance"
         )
@@ -377,12 +463,11 @@ def test_get_by_definition_and_date_round_trip(tmp_path) -> None:
     async def _body(database, children, rules, definitions, instances,
                     events, child, definition):
         created = await instances.upsert(
-            definition.id, child.id, D1, _now_stamp(), due_time="17:30"
-        )
-        fetched = await instances.get(definition.id, D1)
+            definition.id, child.id, D1, _now_stamp(), due_time="17:30", window="morning")
+        fetched = await instances.get(definition.id, child.id, D1, "morning")
         assert fetched == created
         assert fetched.due_time == "17:30"
-        assert await instances.get(definition.id, D2) is None
+        assert await instances.get(definition.id, child.id, D2, "morning") is None
         return fetched
 
     _with_db(tmp_path, "get-round-trip.db")(_body)
@@ -391,7 +476,7 @@ def test_get_by_definition_and_date_round_trip(tmp_path) -> None:
 def test_get_by_id_round_trip(tmp_path) -> None:
     async def _body(database, children, rules, definitions, instances,
                     events, child, definition):
-        created = await instances.upsert(definition.id, child.id, D1, _now_stamp())
+        created = await instances.upsert(definition.id, child.id, D1, _now_stamp(), window="morning")
         fetched = await instances.get_by_id(created.id)
         assert fetched == created
         assert await instances.get_by_id(999) is None
@@ -406,13 +491,12 @@ def test_list_by_child_and_date_filters(tmp_path) -> None:
         other = await children.create("Bo", _now_stamp())
         rule = await rules.create("daily", D1)
         other_definition = await definitions.create(
-            "Make bed", other.id, rule.id, _now_stamp()
+            "Make bed", rule.id, _now_stamp(), assignee_child_ids=[other.id]
         )
-        await instances.upsert(definition.id, child.id, D1, _now_stamp())
-        await instances.upsert(definition.id, child.id, D2, _now_stamp())
+        await instances.upsert(definition.id, child.id, D1, _now_stamp(), window="morning")
+        await instances.upsert(definition.id, child.id, D2, _now_stamp(), window="morning")
         await instances.upsert(
-            other_definition.id, other.id, D1, _now_stamp()
-        )
+            other_definition.id, other.id, D1, _now_stamp(), window="morning")
         mine = await instances.list_by_child_and_date(child.id, D1)
         assert len(mine) == 1
         assert mine[0].child_id == child.id
@@ -426,7 +510,7 @@ def test_list_by_date_range_filters_and_orders(tmp_path) -> None:
     async def _body(database, children, rules, definitions, instances,
                     events, child, definition):
         for day in (D1, D3, D5, D20):
-            await instances.upsert(definition.id, child.id, day, _now_stamp())
+            await instances.upsert(definition.id, child.id, day, _now_stamp(), window="morning")
         found = await instances.list_by_date_range(
             child.id, D2, D6
         )
@@ -460,18 +544,17 @@ def test_list_by_date_range_rejects_inverted_range(tmp_path) -> None:
 def test_delete_future_uncompleted_removes_only_eligible(tmp_path) -> None:
     async def _body(database, children, rules, definitions, instances,
                     events, child, definition):
-        await instances.upsert(definition.id, child.id, D1, _now_stamp())
+        await instances.upsert(definition.id, child.id, D1, _now_stamp(), window="morning")
         future_open = await instances.upsert(
-            definition.id, child.id, D5, _now_stamp()
-        )
-        await instances.upsert(definition.id, child.id, D6, _now_stamp())
+            definition.id, child.id, D5, _now_stamp(), window="morning")
+        await instances.upsert(definition.id, child.id, D6, _now_stamp(), window="morning")
         deleted = await instances.delete_future_uncompleted(
             definition.id, D5
         )
         assert deleted == 2
-        assert await instances.get(definition.id, D1) is not None
-        assert await instances.get(definition.id, D5) is None
-        assert await instances.get(definition.id, D6) is None
+        assert await instances.get(definition.id, child.id, D1, "morning") is not None
+        assert await instances.get(definition.id, child.id, D5, "morning") is None
+        assert await instances.get(definition.id, child.id, D6, "morning") is None
         return deleted
 
     _with_db(tmp_path, "delete-future.db")(_body)
@@ -481,11 +564,9 @@ def test_delete_future_uncompleted_spares_completed(tmp_path) -> None:
     async def _body(database, children, rules, definitions, instances,
                     events, child, definition):
         completed = await instances.upsert(
-            definition.id, child.id, D5, _now_stamp()
-        )
+            definition.id, child.id, D5, _now_stamp(), window="morning")
         open_one = await instances.upsert(
-            definition.id, child.id, D6, _now_stamp()
-        )
+            definition.id, child.id, D6, _now_stamp(), window="morning")
         await events.append(
             completed.id, child.id, "completed", "user", _now_stamp(), True,
             actor_user_id="user-1",
@@ -520,12 +601,12 @@ def test_delete_future_uncompleted_cannot_backdate_cutoff(
     async def _body(database, children, rules, definitions, instances,
                     events, child, definition):
         today = datetime.date.today().isoformat()
-        await instances.upsert(definition.id, child.id, today, _now_stamp())
+        await instances.upsert(definition.id, child.id, today, _now_stamp(), window="morning")
         deleted = await instances.delete_future_uncompleted(
             definition.id, "2020-01-01"
         )
         assert deleted == 1
-        assert await instances.get(definition.id, today) is None
+        assert await instances.get(definition.id, child.id, today, "morning") is None
         return deleted
 
     _with_db(tmp_path, "delete-no-backdate.db")(_body)
@@ -537,16 +618,16 @@ def test_delete_future_uncompleted_other_definitions_untouched(
     async def _body(database, children, rules, definitions, instances,
                     events, child, definition):
         other = await definitions.create(
-            "Make bed", child.id, (await rules.create("daily", D1)).id,
-            _now_stamp(),
+            "Make bed", (await rules.create("daily", D1)).id,
+            _now_stamp(), assignee_child_ids=[child.id],
         )
-        await instances.upsert(definition.id, child.id, D20, _now_stamp())
-        await instances.upsert(other.id, child.id, D20, _now_stamp())
+        await instances.upsert(definition.id, child.id, D20, _now_stamp(), window="morning")
+        await instances.upsert(other.id, child.id, D20, _now_stamp(), window="morning")
         deleted = await instances.delete_future_uncompleted(
             definition.id, D20
         )
         assert deleted == 1
-        assert await instances.get(other.id, D20) is not None
+        assert await instances.get(other.id, child.id, D20, "morning") is not None
         return deleted
 
     _with_db(tmp_path, "delete-scoped.db")(_body)
@@ -561,8 +642,7 @@ def test_append_completion_round_trips(tmp_path) -> None:
     async def _body(database, children, rules, definitions, instances,
                     events, child, definition):
         instance = await instances.upsert(
-            definition.id, child.id, D1, _now_stamp()
-        )
+            definition.id, child.id, D1, _now_stamp(), window="morning")
         event = await events.append(
             instance.id, child.id, "completed", "user", _now_stamp(), True,
             actor_user_id="user-1",
@@ -581,10 +661,10 @@ def test_append_panel_event_round_trips(tmp_path) -> None:
     async def _body(database, children, rules, definitions, instances,
                     events, child, definition):
         instance = await instances.upsert(
-            definition.id, child.id, D1, _now_stamp()
-        )
+            definition.id, child.id, D1, _now_stamp(), window="morning")
         event = await events.append(
             instance.id, child.id, "completed", "panel", _now_stamp(), False,
+                actor_child_id=child.id,
             actor_user_id=None,
         )
         assert event.actor_source == "panel"
@@ -599,8 +679,7 @@ def test_append_uncompleted_with_optional_on_time(tmp_path) -> None:
     async def _body(database, children, rules, definitions, instances,
                     events, child, definition):
         instance = await instances.upsert(
-            definition.id, child.id, D1, _now_stamp()
-        )
+            definition.id, child.id, D1, _now_stamp(), window="morning")
         reversal = await events.append(
             instance.id, child.id, "uncompleted", "user", _now_stamp(), None,
             actor_user_id="user-1",
@@ -621,8 +700,7 @@ def test_append_validation_rejects_bad_shapes(tmp_path) -> None:
     async def _body(database, children, rules, definitions, instances,
                     events, child, definition):
         instance = await instances.upsert(
-            definition.id, child.id, D1, _now_stamp()
-        )
+            definition.id, child.id, D1, _now_stamp(), window="morning")
         with pytest.raises(ValueError, match="event_type"):
             await events.append(
                 instance.id, child.id, "missed", "user", _now_stamp(), True,
@@ -641,17 +719,31 @@ def test_append_validation_rejects_bad_shapes(tmp_path) -> None:
         with pytest.raises(ValueError, match="must not carry"):
             await events.append(
                 instance.id, child.id, "completed", "panel", _now_stamp(), True,
+                actor_child_id=child.id,
                 actor_user_id="user-1",
             )
+        with pytest.raises(ValueError, match="requires actor_child_id"):
+            await events.append(
+                instance.id, child.id, "completed", "panel",
+                _now_stamp(), True,
+            )
+        with pytest.raises(ValueError, match="must not carry actor_child_id"):
+            await events.append(
+                instance.id, child.id, "completed", "user", _now_stamp(), True,
+                actor_user_id="user-1",
+                actor_child_id=child.id,
+            )
         with pytest.raises(ValueError, match="requires was_on_time"):
             await events.append(
-                instance.id, child.id, "completed", "panel", _now_stamp(), None
+                instance.id, child.id, "completed", "panel", _now_stamp(), None,
+                actor_child_id=child.id
             )
         # was_on_time must be a real bool: int-convertible junk that
         # would silently coerce (0.5 -> False) is rejected outright.
         with pytest.raises(ValueError, match="must be True, False or None"):
             await events.append(
-                instance.id, child.id, "completed", "panel", _now_stamp(), 0.5
+                instance.id, child.id, "completed", "panel",
+                _now_stamp(), 0.5, actor_child_id=child.id,
             )
         with pytest.raises(ValueError, match="must be True, False or None"):
             await events.append(
@@ -669,8 +761,7 @@ def test_append_rejects_non_utc_timestamps(tmp_path) -> None:
     async def _body(database, children, rules, definitions, instances,
                     events, child, definition):
         instance = await instances.upsert(
-            definition.id, child.id, D1, _now_stamp()
-        )
+            definition.id, child.id, D1, _now_stamp(), window="morning")
         for bad in (
             "2026-09-14 12:00:00+00:00",  # space separator
             "2026-09-14T12:00:00",  # no offset
@@ -682,7 +773,7 @@ def test_append_rejects_non_utc_timestamps(tmp_path) -> None:
             with pytest.raises(ValueError, match="UTC"):
                 await events.append(
                     instance.id, child.id, "completed", "panel", bad,
-                    True,
+                    True, actor_child_id=child.id,
                 )
         return None
 
@@ -694,8 +785,7 @@ def test_append_requires_was_on_time_strict_bool(tmp_path) -> None:
     async def _body(database, children, rules, definitions, instances,
                     events, child, definition):
         instance = await instances.upsert(
-            definition.id, child.id, D1, _now_stamp()
-        )
+            definition.id, child.id, D1, _now_stamp(), window="morning")
         for bad in (0.5, 1.5, 2, "true", 1):
             with pytest.raises(ValueError, match="must be True, False"):
                 await events.append(
@@ -716,8 +806,7 @@ def test_append_rejects_unknown_instance_or_child(tmp_path) -> None:
                 actor_user_id="user-1",
             )
         instance = await instances.upsert(
-            definition.id, child.id, D1, _now_stamp()
-        )
+            definition.id, child.id, D1, _now_stamp(), window="morning")
         with pytest.raises(ValueError, match="belongs to child"):
             await events.append(
                 instance.id, 999, "completed", "user", _now_stamp(), True,
@@ -739,17 +828,18 @@ def test_completed_uncompleted_recompleted_three_ordered_events(
     async def _body(database, children, rules, definitions, instances,
                     events, child, definition):
         instance = await instances.upsert(
-            definition.id, child.id, D1, _now_stamp()
-        )
+            definition.id, child.id, D1, _now_stamp(), window="morning")
         await events.append(
-            instance.id, child.id, "completed", "panel", _now_stamp(), True
+            instance.id, child.id, "completed", "panel", _now_stamp(), True,
+                actor_child_id=child.id
         )
         await events.append(
             instance.id, child.id, "uncompleted", "user", _now_stamp(), True,
             actor_user_id="user-1",
         )
         await events.append(
-            instance.id, child.id, "completed", "panel", _now_stamp(), False
+            instance.id, child.id, "completed", "panel", _now_stamp(), False,
+                actor_child_id=child.id
         )
         history = await events.list_by_instance(instance.id)
         assert [e.event_type for e in history] == [
@@ -770,8 +860,7 @@ def test_get_latest_for_instance_none_when_untouched(tmp_path) -> None:
     async def _body(database, children, rules, definitions, instances,
                     events, child, definition):
         instance = await instances.upsert(
-            definition.id, child.id, D1, _now_stamp()
-        )
+            definition.id, child.id, D1, _now_stamp(), window="morning")
         return await events.get_latest_for_instance(instance.id)
 
     assert _with_db(tmp_path, "latest-none.db")(_body) is None
@@ -781,10 +870,10 @@ def test_get_latest_returns_uncompleted_when_reversed(tmp_path) -> None:
     async def _body(database, children, rules, definitions, instances,
                     events, child, definition):
         instance = await instances.upsert(
-            definition.id, child.id, D1, _now_stamp()
-        )
+            definition.id, child.id, D1, _now_stamp(), window="morning")
         await events.append(
-            instance.id, child.id, "completed", "panel", _now_stamp(), True
+            instance.id, child.id, "completed", "panel", _now_stamp(), True,
+                actor_child_id=child.id
         )
         await events.append(
             instance.id, child.id, "uncompleted", "user", _now_stamp(), True,
@@ -801,26 +890,26 @@ def test_list_by_child_and_date_range_scopes_by_due_date(tmp_path) -> None:
     async def _body(database, children, rules, definitions, instances,
                     events, child, definition):
         early = await instances.upsert(
-            definition.id, child.id, D1, _now_stamp()
-        )
+            definition.id, child.id, D1, _now_stamp(), window="morning")
         inside = await instances.upsert(
-            definition.id, child.id, D2, _now_stamp()
-        )
+            definition.id, child.id, D2, _now_stamp(), window="morning")
         late = await instances.upsert(
-            definition.id, child.id, D20, _now_stamp()
+            definition.id, child.id, D20, _now_stamp(), window="morning")
+        await events.append(
+            early.id, child.id, "completed", "panel", _now_stamp(), True,
+                actor_child_id=child.id
         )
         await events.append(
-            early.id, child.id, "completed", "panel", _now_stamp(), True
-        )
-        await events.append(
-            inside.id, child.id, "completed", "panel", _now_stamp(), False
+            inside.id, child.id, "completed", "panel", _now_stamp(), False,
+                actor_child_id=child.id
         )
         await events.append(
             inside.id, child.id, "uncompleted", "user", _now_stamp(), True,
             actor_user_id="user-1",
         )
         await events.append(
-            late.id, child.id, "completed", "panel", _now_stamp(), True
+            late.id, child.id, "completed", "panel", _now_stamp(), True,
+                actor_child_id=child.id
         )
         found = await events.list_by_child_and_date_range(
             child.id, D2, D2
@@ -846,8 +935,7 @@ def test_list_events_occurred_at_scope_variant(tmp_path) -> None:
     async def _body(database, children, rules, definitions, instances,
                     events, child, definition):
         late_due = await instances.upsert(
-            definition.id, child.id, D20, _now_stamp()
-        )
+            definition.id, child.id, D20, _now_stamp(), window="morning")
         # The event's occurred_at is today at 08:00 UTC (_now_stamp);
         # the instance is due D20.  The due-date scope queried on D20
         # still finds the event (scoping follows the instance's due
@@ -855,7 +943,7 @@ def test_list_events_occurred_at_scope_variant(tmp_path) -> None:
         # queried on today's date finds it too.
         event = await events.append(
             late_due.id, child.id, "completed", "panel",
-            _now_stamp(), False,
+            _now_stamp(), False, actor_child_id=child.id,
         )
         by_due = await events.list_by_child_and_date_range(
             child.id, D20, D20
@@ -943,7 +1031,12 @@ def test_no_mutation_sql_for_completion_events_anywhere() -> None:
     # UPDATE/DELETE/non-DAO-INSERT paths hit the pattern.
     insert_exempt = {
         "custom_components/nestquest/dao_instances.py",
+        "custom_components/nestquest/migrations.py",  # the rebuild
+        # migrations re-create the table via INSERT..SELECT (append-
+        # order preserved); UPDATE/DELETE stays forbidden everywhere
         "tests/test_schema.py",
+        "tests/test_migrations.py",  # seeds frozen legacy shapes to
+        # exercise the rebuild migrations
         "tests/test_dao_instances.py",  # this guard file; scanned by
         # its own guard's regex spans below instead
     }
@@ -1027,8 +1120,7 @@ def test_completion_events_dao_instance_has_no_mutation_capability(
 
         database.execute = _recording
         instance = await instances.upsert(
-            definition.id, child.id, D1, _now_stamp()
-        )
+            definition.id, child.id, D1, _now_stamp(), window="morning")
         await events.append(
             instance.id, child.id, "completed", "user", _now_stamp(), True,
             actor_user_id="user-1",
@@ -1058,8 +1150,7 @@ def test_append_concurrent_events_serialize(tmp_path) -> None:
                 prepared
             )
             instance = await instances.upsert(
-                definition.id, child.id, D1, _now_stamp()
-            )
+                definition.id, child.id, D1, _now_stamp(), window="morning")
             tasks = [
                 asyncio.ensure_future(
                     events.append(
@@ -1090,7 +1181,7 @@ def test_append_concurrent_events_serialize(tmp_path) -> None:
         child = await children.create("Ada", _now_stamp())
         rule = await rules.create("daily", D1)
         definition = await definitions.create(
-            "Brush teeth", child.id, rule.id, _now_stamp()
+            "Brush teeth", rule.id, _now_stamp(), assignee_child_ids=[child.id]
         )
         return (database, children, rules, definitions, instances,
                 events, child, definition)

tests/test_dao_matrix.py

@@ -71,6 +71,7 @@ ALL_TABLES = (
     "admin_users",
     "schedule_rules",
     "quest_definitions",
+    "quest_definition_assignees",
     "presence_schedules",
     "presence_overrides",
     "quest_instances",
@@ -99,7 +100,10 @@ class World:
         assert await self.admins.add("user-1", _stamp()) is True
         self.rule = await self.rules.create("daily", D1)
         self.definition = await self.definitions.create(
-            "Brush teeth", self.child.id, self.rule.id, _stamp()
+            "Brush teeth",
+            self.rule.id,
+            _stamp(),
+            assignee_child_ids=[self.child.id],
         )
         self.schedule = await self.schedules.upsert_by_child(
             self.child.id, 2, D1, "0,2,4|1,3"
@@ -108,7 +112,8 @@ class World:
             self.child.id, D1, D2, True, note="test"
         )
         self.instance = await self.instances.upsert(
-            self.definition.id, self.child.id, D1, _stamp()
+            self.definition.id, self.child.id, D1, _stamp(),
+            window="morning",
         )
 
 
@@ -206,6 +211,9 @@ def test_matrix_quest_definitions_crud_and_constraints(tmp_path) -> None:
         # insert (seeded) + read
         fetched = await w.definitions.get(w.definition.id)
         assert fetched.title == "Brush teeth"
+        assert [c.id for c in await w.definitions.list_assignees(
+            w.definition.id
+        )] == [w.child.id]
         # update
         await w.definitions.update(w.definition.id, title="Brush TEETH")
         assert (await w.definitions.get(w.definition.id)).title == (
@@ -213,11 +221,21 @@ def test_matrix_quest_definitions_crud_and_constraints(tmp_path) -> None:
         )
         # constraint: FK to a nonexistent child rejected with ValueError
         with pytest.raises(ValueError, match="does not exist"):
-            await w.definitions.create("X", 999, w.rule.id, _stamp())
-        # constraint: inactive child rejected
+            await w.definitions.create(
+                "X", w.rule.id, _stamp(), assignee_child_ids=[999]
+            )
+        # constraint: inactive child rejected on assignment
         await w.children.set_active(w.child2.id, False)
         with pytest.raises(ValueError, match="inactive"):
-            await w.definitions.set_assignee(w.definition.id, w.child2.id)
+            await w.definitions.add_assignee(w.definition.id, w.child2.id)
+        # assignee removal + re-adding the active child
+        assert await w.definitions.remove_assignee(
+            w.definition.id, w.child.id
+        ) is True
+        assert await w.definitions.remove_assignee(
+            w.definition.id, w.child.id
+        ) is False
+        await w.definitions.add_assignee(w.definition.id, w.child.id)
         # set_active: deactivate, never delete
         assert await w.definitions.set_active(w.definition.id, False) == 1
         assert (await w.definitions.get(w.definition.id)).is_active is False
@@ -274,12 +292,15 @@ def test_matrix_presence_overrides_crud_and_constraints(tmp_path) -> None:
 def test_matrix_quest_instances_crud_and_constraints(tmp_path) -> None:
     async def _body(w: World):
         # insert (seeded) + read
-        fetched = await w.instances.get(w.definition.id, D1)
+        fetched = await w.instances.get(
+            w.definition.id, w.child.id, D1, "morning"
+        )
         assert fetched == w.instance
         # update path: conflict refresh on the OPEN instance — same row
         # id, snapshot columns (due_time) actually rewritten.
         refreshed = await w.instances.upsert(
-            w.definition.id, w.child.id, D1, _stamp(), due_time="17:00"
+            w.definition.id, w.child.id, D1, _stamp(),
+            window="morning", due_time="17:00",
         )
         assert refreshed.id == fetched.id, (
             "the conflict path must refresh the existing row in place"
@@ -299,15 +320,15 @@ def test_matrix_quest_instances_constraints(tmp_path) -> None:
         # proving the schema backs the DAO's idempotency.
         await w.database.execute(
             "INSERT INTO quest_instances (definition_id, child_id, "
-            "due_date, due_time, generated_at) "
-            "VALUES (?, ?, ?, NULL, ?)",
+            "window, due_date, due_time, generated_at) "
+            "VALUES (?, ?, 'morning', ?, NULL, ?)",
             (w.definition.id, w.child.id, D20, _stamp()),
         )
         with pytest.raises(sqlite3.IntegrityError):
             await w.database.execute(
                 "INSERT INTO quest_instances (definition_id, child_id, "
-                "due_date, due_time, generated_at) "
-                "VALUES (?, ?, ?, NULL, ?)",
+                "window, due_date, due_time, generated_at) "
+                "VALUES (?, ?, 'morning', ?, NULL, ?)",
                 (w.definition.id, w.child.id, D20, _stamp()),
             )
         # delete future uncompleted removes D20's open instance
@@ -323,10 +344,11 @@ def test_matrix_quest_instances_constraints(tmp_path) -> None:
 def test_matrix_quest_instances_upsert_idempotency(tmp_path) -> None:
     async def _body(w: World):
         first = await w.instances.upsert(
-            w.definition.id, w.child.id, D2, _stamp()
+            w.definition.id, w.child.id, D2, _stamp(), window="morning"
         )
         second = await w.instances.upsert(
-            w.definition.id, w.child.id, D2, _stamp(), due_time="17:00"
+            w.definition.id, w.child.id, D2, _stamp(),
+            window="morning", due_time="17:00",
         )
         assert second.id == first.id
         count = await w.database.fetch_one(
@@ -350,14 +372,16 @@ def test_matrix_completion_events_append_read_and_no_mutation(
     async def _body(w: World):
         # insert: append a completion then a reversal, then re-complete
         await w.events.append(
-            w.instance.id, w.child.id, "completed", "panel", _stamp(), True
+            w.instance.id, w.child.id, "completed", "panel", _stamp(), True,
+            actor_child_id=w.child.id,
         )
         await w.events.append(
             w.instance.id, w.child.id, "uncompleted", "user", _stamp(), None,
             actor_user_id="user-1",
         )
         await w.events.append(
-            w.instance.id, w.child.id, "completed", "panel", _stamp(), False
+            w.instance.id, w.child.id, "completed", "panel", _stamp(), False,
+            actor_child_id=w.child.id,
         )
         # read: full ordered history + latest
         history = await w.events.list_by_instance(w.instance.id)

tests/test_dao_presence.py

@@ -619,4 +619,173 @@ def test_dao_presence_test_file_uses_dao_not_raw_table_sql() -> None:
     )
     assert sql_pattern.search(remaining) is None, (
         "tests must go through the DAO, not raw SQL, for these tables"
-    )
+    )
+
+# ---------------------------------------------------------------------------
+# Presence overrides: overlap rejection naming the conflict
+# ---------------------------------------------------------------------------
+
+
+def test_override_create_round_trip_single_and_range(tmp_path) -> None:
+    async def _body(database, schedules, overrides, children, child):
+        single = await overrides.create(
+            child.id, "2026-07-20", "2026-07-20", False
+        )
+        assert (single.start_date, single.end_date) == ("2026-07-20",) * 2
+        span = await overrides.create(
+            child.id, "2026-08-01", "2026-08-05", True, note="traded week"
+        )
+        assert span.is_present is True
+        assert span.note == "traded week"
+        # Distinct, non-overlapping ranges coexist.
+        listed = await overrides.list_by_child_and_range(
+            child.id, "2026-01-01", "2026-12-31"
+        )
+        assert [row.id for row in listed] == [single.id, span.id]
+        return listed
+
+    _with_db(tmp_path, "override-round-trip.db")(_body)
+
+
+def test_override_overlap_rejected_and_names_the_conflict(tmp_path) -> None:
+    async def _body(database, schedules, overrides, children, child):
+        existing = await overrides.create(
+            child.id, "2026-07-20", "2026-07-24", False, note="holiday"
+        )
+        for start, end in (
+            ("2026-07-24", "2026-07-26"),  # touches the existing end
+            ("2026-07-18", "2026-07-20"),  # touches the existing start
+            ("2026-07-21", "2026-07-22"),  # fully inside
+            ("2026-07-01", "2026-07-30"),  # fully covering
+        ):
+            with pytest.raises(ValueError, match="overlaps existing"):
+                await overrides.create(
+                    child.id, start, end, True, note="swap"
+                )
+        # The error NAMES the conflicting override (id + its range).
+        with pytest.raises(
+            ValueError,
+            match=(
+                rf"override {existing.id} "
+                rf"\[2026-07-20, 2026-07-24\].*is_present=False"
+            ),
+        ):
+            await overrides.create(child.id, "2026-07-22", "2026-07-22", True)
+        # Nothing was written by any rejected attempt.
+        listed = await overrides.list_by_child_and_range(
+            child.id, "2026-01-01", "2026-12-31"
+        )
+        assert [row.id for row in listed] == [existing.id]
+        return existing
+
+    _with_db(tmp_path, "override-overlap.db")(_body)
+
+
+def test_override_overlap_is_per_child(tmp_path) -> None:
+    """Different children's overrides may cover the same dates: the
+    conflict rule is per child."""
+    async def _body(database, schedules, overrides, children, child):
+        other = await children.create("Bo", NOW)
+        await overrides.create(child.id, "2026-07-20", "2026-07-24", False)
+        twin = await overrides.create(
+            other.id, "2026-07-20", "2026-07-24", True
+        )
+        assert twin.child_id == other.id
+        listed = await overrides.list_by_child_and_range(
+            other.id, "2026-01-01", "2026-12-31"
+        )
+        assert [row.id for row in listed] == [twin.id]
+        return twin
+
+    _with_db(tmp_path, "override-per-child.db")(_body)
+
+
+def test_override_remove_then_recreate_overlapping(tmp_path) -> None:
+    async def _body(database, schedules, overrides, children, child):
+        first = await overrides.create(
+            child.id, "2026-07-20", "2026-07-24", False
+        )
+        assert await overrides.delete(first.id) is True
+        assert await overrides.delete(first.id) is False
+        replacement = await overrides.create(
+            child.id, "2026-07-20", "2026-07-24", True, note="swap back"
+        )
+        assert replacement.is_present is True
+        return replacement
+
+    _with_db(tmp_path, "override-recreate.db")(_body)
+
+
+def test_override_create_racing_conflicts_serialize(tmp_path) -> None:
+    """Two racing creates for the same child and dates: exactly one
+    lands, the other is rejected with the overlap error.  DETERMINISTIC
+    gate: task A is paused at its INSERT — inside its open transaction,
+    after its overlap probe — so task B is created while A provably
+    holds the connection lock and must queue; B then re-runs the probe
+    against A's committed row and is rejected."""
+    import asyncio as asyncio_module
+    from unittest.mock import MagicMock
+
+    async def _main():
+        from custom_components.nestquest.dao_children import ChildrenDao
+        from custom_components.nestquest.dao_presence import (
+            PresenceOverridesDao,
+        )
+        from custom_components.nestquest.db import NestQuestDatabase
+        from custom_components.nestquest.migrations import apply_migrations
+
+        armed = {"active": False, "gated": False}
+        gate_open = asyncio_module.Event()
+        a_started = asyncio_module.Event()
+
+        hass = MagicMock()
+
+        async def _gated_executor(fn, *args):
+            if armed["active"]:
+                # Gate the FIRST _execute after arming: task A's INSERT,
+                # which runs inside its open transaction (BEGIN already
+                # executed) after the overlap probe.
+                if getattr(fn, "__name__", "") == "_execute" and not armed["gated"]:
+                    armed["gated"] = True
+                    a_started.set()
+                    await gate_open.wait()
+            return fn(*args)
+
+        hass.async_add_executor_job = _gated_executor
+        database = NestQuestDatabase(hass)
+        await database.open(tmp_path / "override-race.db")
+        try:
+            await apply_migrations(database)
+            children = ChildrenDao(database)
+            overrides = PresenceOverridesDao(database)
+            child = await children.create("Ada", NOW)
+
+            armed["active"] = True
+            task_a = asyncio_module.ensure_future(
+                overrides.create(child.id, "2026-07-20", "2026-07-24", True)
+            )
+            await a_started.wait()
+            armed["active"] = False
+            task_b = asyncio_module.ensure_future(
+                overrides.create(child.id, "2026-07-22", "2026-07-26", False)
+            )
+            await asyncio_module.sleep(0)
+            gate_open.set()
+            record_a, error_b = await asyncio_module.gather(
+                task_a, task_b, return_exceptions=True
+            )
+            assert isinstance(record_a, object) and not isinstance(
+                record_a, BaseException
+            ), f"A must land: {record_a!r}"
+            assert isinstance(error_b, ValueError), (
+                f"B must be rejected with the overlap error: {error_b!r}"
+            )
+            assert "overlaps existing" in str(error_b)
+            listed = await overrides.list_by_child_and_range(
+                child.id, "2026-01-01", "2026-12-31"
+            )
+            assert [row.id for row in listed] == [record_a.id]
+        finally:
+            await database.close()
+
+    asyncio.new_event_loop().run_until_complete(_main())

tests/test_dao_rules.py

@@ -9,12 +9,21 @@ import pytest
 from custom_components.nestquest.dao_children import ChildrenDao
 from custom_components.nestquest.dao_rules import (
     ScheduleRuleRecord,
+    ScheduleRuleStorage,
     ScheduleRulesDao,
     QuestDefinitionRecord,
+    QuestDefinitionWindowRecord,
     QuestDefinitionsDao,
+    schedule_rule_from_storage,
+    schedule_rule_to_storage,
 )
 from custom_components.nestquest.db import NestQuestDatabase
 from custom_components.nestquest.migrations import apply_migrations
+from custom_components.nestquest.recurrence import (
+    RuleType,
+    RuleValidationError,
+    ScheduleRule,
+)
 
 
 def _run(coro):
@@ -266,7 +275,7 @@ def test_rule_delete_unreferenced_succeeds(tmp_path) -> None:
 def test_rule_delete_referenced_is_rejected(tmp_path) -> None:
     async def _body(database, rules, definitions, children, child):
         rule = await rules.create("daily", "2026-09-14")
-        await definitions.create("Brush teeth", child.id, rule.id, NOW)
+        await definitions.create("Brush teeth", rule.id, NOW)
         assert await rules.delete_if_unreferenced(rule.id) is False
         fetched = await rules.get(rule.id)
         assert fetched is not None, (
@@ -288,7 +297,7 @@ def test_rule_delete_after_last_reference_removed_succeeds(tmp_path) -> None:
     async def _body(database, rules, definitions, children, child):
         rule = await rules.create("daily", "2026-09-14")
         definition = await definitions.create(
-            "Brush teeth", child.id, rule.id, NOW
+            "Brush teeth", rule.id, NOW
         )
         assert await rules.delete_if_unreferenced(rule.id) is False
         await definitions.set_active(definition.id, False)
@@ -335,12 +344,12 @@ def test_rule_delete_concurrent_with_definition_create_is_safe(
                 import custom_components.nestquest.dao_rules as dao_rules
 
                 original_validate = (
-                    dao_rules.QuestDefinitionsDao._validate_assignable
+                    dao_rules.QuestDefinitionsDao._validate_rule_exists
                 )
                 release = asyncio.Event()
                 started = asyncio.Event()
 
-                async def _pausing_validate(self, child_id, rule_id):
+                async def _pausing_validate(self, rule_id):
                     # Run the real validation FIRST (this is the
                     # time-of-check), THEN pause: the delete task gets
                     # scheduled while the create sits between its
@@ -348,19 +357,17 @@ def test_rule_delete_concurrent_with_definition_create_is_safe(
                     # transaction must keep the delete queued until the
                     # insert commits, so the create must win the race
                     # and the delete must be rejected as referenced.
-                    await original_validate(self, child_id, rule_id)
+                    await original_validate(self, rule_id)
                     if rule_id == rule_a.id and not started.is_set():
                         started.set()
                         await release.wait()
 
-                dao_rules.QuestDefinitionsDao._validate_assignable = (
+                dao_rules.QuestDefinitionsDao._validate_rule_exists = (
                     _pausing_validate
                 )
                 try:
                     create_task = asyncio.ensure_future(
-                        definitions.create(
-                            "Brush teeth", child.id, rule_a.id, NOW
-                        )
+                        definitions.create("Brush teeth", rule_a.id, NOW)
                     )
                     await started.wait()
                     delete_task = asyncio.ensure_future(
@@ -382,7 +389,7 @@ def test_rule_delete_concurrent_with_definition_create_is_safe(
 
                 async def _create():
                     return await definitions.create(
-                        "Brush teeth", child.id, rule_a.id, NOW
+                        "Brush teeth", rule_a.id, NOW
                     )
 
                 delete_task = asyncio.ensure_future(_delete())
@@ -424,6 +431,249 @@ def test_rule_delete_concurrent_with_definition_create_is_safe(
     assert create_won is False
 
 
+# ---------------------------------------------------------------------------
+# ScheduleRule <-> storage mapping
+# ---------------------------------------------------------------------------
+
+
+_RULE_STORAGE_CASES = [
+    (
+        ScheduleRule(rule_type=RuleType.DAILY, start_date="2026-09-01"),
+        ScheduleRuleStorage(
+            "daily", 1, None, None, None, None, "2026-09-01", None
+        ),
+    ),
+    (
+        ScheduleRule(
+            rule_type=RuleType.DAILY,
+            interval=3,
+            start_date="2026-09-01",
+            end_date="2026-12-31",
+        ),
+        ScheduleRuleStorage(
+            "daily", 3, None, None, None, None, "2026-09-01", "2026-12-31"
+        ),
+    ),
+    (
+        ScheduleRule(
+            rule_type=RuleType.WEEKLY,
+            weekday_set={2, 0, 4},
+            start_date="2026-09-01",
+        ),
+        ScheduleRuleStorage(
+            "weekly", 1, "0,2,4", None, None, None, "2026-09-01", None
+        ),
+    ),
+    (
+        ScheduleRule(
+            rule_type=RuleType.CUSTOM_DAYS,
+            weekday_set={1, 3, 5},
+            interval=2,
+            start_date="2026-09-01",
+        ),
+        ScheduleRuleStorage(
+            "custom", 2, "1,3,5", None, None, None, "2026-09-01", None
+        ),
+    ),
+    (
+        ScheduleRule(
+            rule_type=RuleType.MONTHLY_DAY,
+            day_of_month=15,
+            start_date="2026-09-01",
+        ),
+        ScheduleRuleStorage(
+            "monthly", 1, None, 15, None, None, "2026-09-01", None
+        ),
+    ),
+    (
+        ScheduleRule(
+            rule_type=RuleType.MONTHLY_DAY,
+            day_of_month=31,
+            interval=3,
+            start_date="2026-09-01",
+        ),
+        ScheduleRuleStorage(
+            "monthly", 3, None, 31, None, None, "2026-09-01", None
+        ),
+    ),
+    (
+        ScheduleRule(
+            rule_type=RuleType.MONTHLY_WEEKDAY,
+            nth_weekday=2,
+            nth_weekday_weekday=1,
+            start_date="2026-09-01",
+        ),
+        ScheduleRuleStorage(
+            "monthly", 1, "1", None, 2, None, "2026-09-01", None
+        ),
+    ),
+    (
+        ScheduleRule(
+            rule_type=RuleType.MONTHLY_WEEKDAY,
+            nth_weekday=-1,
+            nth_weekday_weekday=4,
+            interval=2,
+            start_date="2026-09-01",
+        ),
+        ScheduleRuleStorage(
+            "monthly", 2, "4", None, -1, None, "2026-09-01", None
+        ),
+    ),
+    (
+        ScheduleRule(
+            rule_type=RuleType.YEARLY, month=6, start_date="2026-09-01"
+        ),
+        ScheduleRuleStorage(
+            "yearly", 1, None, None, None, 6, "2026-09-01", None
+        ),
+    ),
+    (
+        ScheduleRule(
+            rule_type=RuleType.YEARLY,
+            month=2,
+            day_of_month=29,
+            start_date="2026-09-01",
+        ),
+        ScheduleRuleStorage(
+            "yearly", 1, None, 29, None, 2, "2026-09-01", None
+        ),
+    ),
+]
+
+
+@pytest.mark.parametrize("rule, storage", _RULE_STORAGE_CASES)
+def test_schedule_rule_to_storage_maps_each_type(rule, storage) -> None:
+    assert schedule_rule_to_storage(rule) == storage
+
+
+@pytest.mark.parametrize("rule, storage", _RULE_STORAGE_CASES)
+def test_schedule_rule_from_storage_rebuilds_each_type(rule, storage) -> None:
+    assert schedule_rule_from_storage(storage) == rule
+
+
+@pytest.mark.parametrize("rule, storage", _RULE_STORAGE_CASES)
+def test_schedule_rule_round_trips_losslessly_both_directions(
+    rule, storage
+) -> None:
+    assert schedule_rule_from_storage(schedule_rule_to_storage(rule)) == rule
+    assert schedule_rule_to_storage(schedule_rule_from_storage(storage)) == storage
+
+
+@pytest.mark.parametrize(
+    "storage",
+    [
+        # monthly with neither day_of_month nor nth_weekday
+        ScheduleRuleStorage(
+            "monthly", 1, None, None, None, None, "2026-09-01", None
+        ),
+        # monthly with both day_of_month and nth_weekday
+        ScheduleRuleStorage(
+            "monthly", 1, None, 15, 2, None, "2026-09-01", None
+        ),
+        # MONTHLY_WEEKDAY whose weekday_set is None
+        ScheduleRuleStorage(
+            "monthly", 1, None, None, 2, None, "2026-09-01", None
+        ),
+        # MONTHLY_WEEKDAY whose weekday_set is empty
+        ScheduleRuleStorage("monthly", 1, "", None, 2, None, "2026-09-01", None),
+        # MONTHLY_WEEKDAY whose weekday_set is multi-element
+        ScheduleRuleStorage(
+            "monthly", 1, "1,3", None, 2, None, "2026-09-01", None
+        ),
+        # unknown storage rule_type
+        ScheduleRuleStorage(
+            "sometimes", 1, None, None, None, None, "2026-09-01", None
+        ),
+    ],
+)
+def test_schedule_rule_from_storage_rejects_ambiguous_or_invalid(
+    storage,
+) -> None:
+    with pytest.raises(RuleValidationError):
+        schedule_rule_from_storage(storage)
+
+
+def test_schedule_rule_from_storage_rejects_malformed_weekday_csv() -> None:
+    with pytest.raises(RuleValidationError):
+        schedule_rule_from_storage(
+            ScheduleRuleStorage(
+                "weekly", 1, "0,2,x", None, None, None, "2026-09-01", None
+            )
+        )
+    with pytest.raises(RuleValidationError):
+        schedule_rule_from_storage(
+            ScheduleRuleStorage(
+                "weekly", 1, "7", None, None, None, "2026-09-01", None
+            )
+        )
+
+
+@pytest.mark.parametrize(
+    "storage",
+    [
+        # DAILY carrying shape columns it must not hold.
+        ScheduleRuleStorage(
+            "daily", 1, "0", None, None, None, "2026-09-01", None
+        ),
+        ScheduleRuleStorage(
+            "daily", 1, None, 15, None, None, "2026-09-01", None
+        ),
+        ScheduleRuleStorage(
+            "daily", 1, None, None, 2, None, "2026-09-01", None
+        ),
+        ScheduleRuleStorage(
+            "daily", 1, None, None, None, 6, "2026-09-01", None
+        ),
+        # WEEKLY carrying shape columns it must not hold.
+        ScheduleRuleStorage(
+            "weekly", 1, "0,2", 15, None, None, "2026-09-01", None
+        ),
+        ScheduleRuleStorage(
+            "weekly", 1, "0,2", None, None, 6, "2026-09-01", None
+        ),
+        # CUSTOM_DAYS carrying shape columns it must not hold.
+        ScheduleRuleStorage(
+            "custom", 1, "0,2", 15, None, None, "2026-09-01", None
+        ),
+        ScheduleRuleStorage(
+            "custom", 1, "0,2", None, None, 6, "2026-09-01", None
+        ),
+        # MONTHLY_DAY carrying weekday_set (folded-only column) or month.
+        ScheduleRuleStorage(
+            "monthly", 1, "1", 15, None, None, "2026-09-01", None
+        ),
+        ScheduleRuleStorage(
+            "monthly", 1, None, 15, None, 6, "2026-09-01", None
+        ),
+        # MONTHLY_WEEKDAY carrying a forbidden month.
+        ScheduleRuleStorage(
+            "monthly", 1, "1", None, 2, 6, "2026-09-01", None
+        ),
+        # YEARLY carrying weekday_set or nth_weekday.
+        ScheduleRuleStorage(
+            "yearly", 1, "0", None, None, 6, "2026-09-01", None
+        ),
+        ScheduleRuleStorage(
+            "yearly", 1, None, None, 2, 6, "2026-09-01", None
+        ),
+    ],
+)
+def test_schedule_rule_from_storage_rejects_forbidden_fields(storage) -> None:
+    with pytest.raises(RuleValidationError):
+        schedule_rule_from_storage(storage)
+
+
+def test_schedule_rule_from_storage_rejects_duplicate_weekday_token() -> None:
+    """A MONTHLY_WEEKDAY with a duplicate CSV token ("1,1") must raise,
+    never silently canonicalize to a single weekday on re-storage."""
+    with pytest.raises(RuleValidationError):
+        schedule_rule_from_storage(
+            ScheduleRuleStorage(
+                "monthly", 1, "1,1", None, 2, None, "2026-09-01", None
+            )
+        )
+
+
 # ---------------------------------------------------------------------------
 # quest_definitions: create / get
 # ---------------------------------------------------------------------------
@@ -434,20 +684,24 @@ def test_definition_create_returns_typed_record(tmp_path) -> None:
         rule = await rules.create("weekly", "2026-09-14", weekday_set="0,2")
         definition = await definitions.create(
             "Brush teeth",
-            child.id,
             rule.id,
             NOW,
             description="Morning and night",
             icon="mdi:tooth",
             due_time="08:00",
+            assignee_child_ids=[child.id],
         )
         assert isinstance(definition, QuestDefinitionRecord)
         assert definition.title == "Brush teeth"
-        assert definition.child_id == child.id
         assert definition.schedule_rule_id == rule.id
         assert definition.due_time == "08:00"
         assert definition.is_active is True
         assert definition.created_at == NOW
+        assert not hasattr(definition, "child_id"), (
+            "D-008: assignment lives in quest_definition_assignees"
+        )
+        assignees = await definitions.list_assignees(definition.id)
+        assert [c.id for c in assignees] == [child.id]
         return definition
 
     _with_db(tmp_path, "definition-create.db")(_body)
@@ -460,26 +714,30 @@ def test_definition_get_missing_returns_none(tmp_path) -> None:
     assert _with_db(tmp_path, "definition-get-missing.db")(_body) is None
 
 
-def test_definition_create_unknown_child_raises_value_error(
+def test_definition_create_unknown_assignee_raises_value_error(
     tmp_path,
 ) -> None:
     async def _body(database, rules, definitions, children, child):
         rule = await rules.create("daily", "2026-09-14")
         with pytest.raises(ValueError, match="does not exist"):
-            await definitions.create("X", 999, rule.id, NOW)
+            await definitions.create(
+                "X", rule.id, NOW, assignee_child_ids=[999]
+            )
         return None
 
     _with_db(tmp_path, "definition-bad-child.db")(_body)
 
 
-def test_definition_create_inactive_child_raises_value_error(
+def test_definition_create_inactive_assignee_raises_value_error(
     tmp_path,
 ) -> None:
     async def _body(database, rules, definitions, children, child):
         rule = await rules.create("daily", "2026-09-14")
         await children.set_active(child.id, False)
         with pytest.raises(ValueError, match="inactive"):
-            await definitions.create("X", child.id, rule.id, NOW)
+            await definitions.create(
+                "X", rule.id, NOW, assignee_child_ids=[child.id]
+            )
         return None
 
     _with_db(tmp_path, "definition-inactive-child.db")(_body)
@@ -490,7 +748,7 @@ def test_definition_create_unknown_rule_raises_value_error(
 ) -> None:
     async def _body(database, rules, definitions, children, child):
         with pytest.raises(ValueError, match="does not exist"):
-            await definitions.create("X", child.id, 999, NOW)
+            await definitions.create("X", 999, NOW)
         return None
 
     _with_db(tmp_path, "definition-bad-rule.db")(_body)
@@ -505,9 +763,11 @@ def test_definition_list_by_child_filters_and_orders(tmp_path) -> None:
     async def _body(database, rules, definitions, children, child):
         rule = await rules.create("daily", "2026-09-14")
         other_child = await children.create("Bo", NOW)
-        await definitions.create("A", child.id, rule.id, NOW)
-        await definitions.create("B", child.id, rule.id, NOW)
-        await definitions.create("C", other_child.id, rule.id, NOW)
+        await definitions.create("A", rule.id, NOW, assignee_child_ids=[child.id])
+        await definitions.create("B", rule.id, NOW, assignee_child_ids=[child.id])
+        await definitions.create(
+            "C", rule.id, NOW, assignee_child_ids=[other_child.id]
+        )
         mine = await definitions.list_by_child(child.id)
         assert [d.title for d in mine] == ["B", "A"]
         return mine
@@ -527,8 +787,8 @@ def test_definition_list_by_child_missing_child_returns_empty(
 def test_definition_list_active_excludes_inactive(tmp_path) -> None:
     async def _body(database, rules, definitions, children, child):
         rule = await rules.create("daily", "2026-09-14")
-        first = await definitions.create("A", child.id, rule.id, NOW)
-        await definitions.create("B", child.id, rule.id, NOW)
+        first = await definitions.create("A", rule.id, NOW)
+        await definitions.create("B", rule.id, NOW)
         await definitions.set_active(first.id, False)
         active = await definitions.list_active()
         assert [d.title for d in active] == ["B"]
@@ -547,7 +807,7 @@ def test_definition_update_fields_round_trip(tmp_path) -> None:
     async def _body(database, rules, definitions, children, child):
         rule = await rules.create("daily", "2026-09-14")
         definition = await definitions.create(
-            "A", child.id, rule.id, NOW, due_time="08:00"
+            "A", rule.id, NOW, due_time="08:00"
         )
         assert await definitions.update(
             definition.id,
@@ -572,9 +832,11 @@ def test_definition_update_cannot_change_assignee_or_active(
     async def _body(database, rules, definitions, children, child):
         rule = await rules.create("daily", "2026-09-14")
         other = await children.create("Bo", NOW)
-        definition = await definitions.create("A", child.id, rule.id, NOW)
+        definition = await definitions.create(
+            "A", rule.id, NOW, assignee_child_ids=[child.id]
+        )
         # title= / child_id= / is_active= are NOT update() parameters;
-        # this asserts the API shape: reassignment and activation have
+        # this asserts the API shape: assignment and activation have
         # their own explicit methods.
         import inspect
 
@@ -590,7 +852,10 @@ def test_definition_update_cannot_change_assignee_or_active(
             definition.id, title="A2"
         ) == 1
         fetched = await definitions.get(definition.id)
-        assert fetched.child_id == child.id
+        assert [c.id for c in await definitions.list_assignees(definition.id)] == [
+            child.id
+        ]
+        assert other.id not in [c.id for c in await definitions.list_assignees(definition.id)]
         assert fetched.is_active is True
         return fetched
 
@@ -600,7 +865,7 @@ def test_definition_update_cannot_change_assignee_or_active(
 def test_definition_update_no_fields_returns_zero(tmp_path) -> None:
     async def _body(database, rules, definitions, children, child):
         rule = await rules.create("daily", "2026-09-14")
-        definition = await definitions.create("A", child.id, rule.id, NOW)
+        definition = await definitions.create("A", rule.id, NOW)
         return await definitions.update(definition.id)
 
     assert _with_db(tmp_path, "definition-update-empty.db")(_body) == 0
@@ -612,7 +877,6 @@ def test_definition_update_can_clear_optional_fields(tmp_path) -> None:
         rule = await rules.create("daily", "2026-09-14")
         definition = await definitions.create(
             "A",
-            child.id,
             rule.id,
             NOW,
             description="d",
@@ -646,7 +910,7 @@ def test_definition_update_missing_returns_zero(tmp_path) -> None:
 def test_definition_set_active_round_trip(tmp_path) -> None:
     async def _body(database, rules, definitions, children, child):
         rule = await rules.create("daily", "2026-09-14")
-        definition = await definitions.create("A", child.id, rule.id, NOW)
+        definition = await definitions.create("A", rule.id, NOW)
         assert await definitions.set_active(definition.id, False) == 1
         fetched = await definitions.get(definition.id)
         assert fetched.is_active is False
@@ -683,76 +947,242 @@ def test_definition_no_delete_method_exists(tmp_path) -> None:
     _with_db(tmp_path, "definition-no-delete.db")(_body)
 
 
-def test_definition_set_assignee_round_trip(tmp_path) -> None:
+def test_definition_add_assignee_round_trip(tmp_path) -> None:
     async def _body(database, rules, definitions, children, child):
         rule = await rules.create("daily", "2026-09-14")
         other = await children.create("Bo", NOW)
-        definition = await definitions.create("A", child.id, rule.id, NOW)
-        assert await definitions.set_assignee(definition.id, other.id) == 1
-        fetched = await definitions.get(definition.id)
-        assert fetched.child_id == other.id
-        return fetched
+        definition = await definitions.create(
+            "A", rule.id, NOW, assignee_child_ids=[child.id]
+        )
+        await definitions.add_assignee(definition.id, other.id)
+        assignees = await definitions.list_assignees(definition.id)
+        assert sorted(c.id for c in assignees) == sorted([child.id, other.id])
+        # Idempotent: re-adding an existing assignee stays a no-op.
+        await definitions.add_assignee(definition.id, other.id)
+        assignees = await definitions.list_assignees(definition.id)
+        assert sorted(c.id for c in assignees) == sorted([child.id, other.id])
+        return assignees
 
-    _with_db(tmp_path, "definition-set-assignee.db")(_body)
+    _with_db(tmp_path, "definition-add-assignee.db")(_body)
 
 
-def test_definition_set_assignee_inactive_child_raises(tmp_path) -> None:
+def test_definition_add_assignee_inactive_child_raises(tmp_path) -> None:
     async def _body(database, rules, definitions, children, child):
         rule = await rules.create("daily", "2026-09-14")
         other = await children.create("Bo", NOW)
-        definition = await definitions.create("A", child.id, rule.id, NOW)
+        definition = await definitions.create(
+            "A", rule.id, NOW, assignee_child_ids=[child.id]
+        )
         await children.set_active(other.id, False)
         with pytest.raises(ValueError, match="inactive"):
-            await definitions.set_assignee(definition.id, other.id)
-        fetched = await definitions.get(definition.id)
-        assert fetched.child_id == child.id, (
-            "failed reassignment must leave the current assignee intact"
+            await definitions.add_assignee(definition.id, other.id)
+        assignees = await definitions.list_assignees(definition.id)
+        assert [c.id for c in assignees] == [child.id], (
+            "failed assignment must leave the current assignees intact"
         )
-        return fetched
+        return assignees
 
     _with_db(tmp_path, "definition-assignee-inactive.db")(_body)
 
 
-def test_definition_set_assignee_unknown_child_raises(tmp_path) -> None:
+def test_definition_add_assignee_unknown_child_raises(tmp_path) -> None:
     async def _body(database, rules, definitions, children, child):
         rule = await rules.create("daily", "2026-09-14")
-        definition = await definitions.create("A", child.id, rule.id, NOW)
+        definition = await definitions.create(
+            "A", rule.id, NOW, assignee_child_ids=[child.id]
+        )
         with pytest.raises(ValueError, match="does not exist"):
-            await definitions.set_assignee(definition.id, 999)
+            await definitions.add_assignee(definition.id, 999)
         return None
 
     _with_db(tmp_path, "definition-assignee-unknown.db")(_body)
 
 
-def test_definition_set_assignee_missing_definition_returns_zero(
+def test_definition_add_assignee_missing_definition_raises(tmp_path) -> None:
+    async def _body(database, rules, definitions, children, child):
+        with pytest.raises(ValueError, match="does not exist"):
+            await definitions.add_assignee(999, child.id)
+        return None
+
+    _with_db(tmp_path, "definition-assignee-missing.db")(_body)
+
+
+def test_definition_remove_assignee_round_trip(tmp_path) -> None:
+    async def _body(database, rules, definitions, children, child):
+        rule = await rules.create("daily", "2026-09-14")
+        other = await children.create("Bo", NOW)
+        definition = await definitions.create(
+            "A", rule.id, NOW, assignee_child_ids=[child.id, other.id]
+        )
+        assert await definitions.remove_assignee(definition.id, other.id) is True
+        assignees = await definitions.list_assignees(definition.id)
+        assert [c.id for c in assignees] == [child.id]
+        # Removing a non-assignee reports False.
+        assert await definitions.remove_assignee(definition.id, other.id) is False
+        return assignees
+
+    _with_db(tmp_path, "definition-remove-assignee.db")(_body)
+
+
+def test_definition_list_assignees_orders_by_child_sort_order(
     tmp_path,
 ) -> None:
     async def _body(database, rules, definitions, children, child):
-        other = await children.create("Bo", NOW)
-        return await definitions.set_assignee(999, other.id)
+        rule = await rules.create("daily", "2026-09-14")
+        second = await children.create("Bo", NOW)
+        third = await children.create("Cleo", NOW)
+        await children.reorder([third.id, child.id, second.id])
+        definition = await definitions.create(
+            "A", rule.id, NOW, assignee_child_ids=[second.id, child.id, third.id]
+        )
+        assignees = await definitions.list_assignees(definition.id)
+        assert [c.id for c in assignees] == [third.id, child.id, second.id]
+        return assignees
 
-    assert _with_db(tmp_path, "definition-assignee-missing.db")(_body) == 0
+    _with_db(tmp_path, "definition-assignees-order.db")(_body)
 
 
-def test_definition_set_assignee_leaves_history_rows_alone(
+def test_definition_upsert_window_round_trip(tmp_path) -> None:
+    async def _body(database, rules, definitions, children, child):
+        rule = await rules.create("daily", "2026-09-14")
+        definition = await definitions.create("A", rule.id, NOW)
+        window = await definitions.upsert_window(
+            definition.id, "morning", due_time="09:00"
+        )
+        assert window == QuestDefinitionWindowRecord(
+            definition.id, "morning", "09:00"
+        )
+        # Upsert: re-declaring the same window updates in place, never
+        # duplicates (one row per definition+window).
+        updated = await definitions.upsert_window(
+            definition.id, "morning", due_time="09:30"
+        )
+        assert updated.due_time == "09:30"
+        rows = await definitions.list_windows(definition.id)
+        assert [w.window for w in rows] == ["morning"]
+        # All three windows list in const order regardless of insertion.
+        await definitions.upsert_window(definition.id, "evening")
+        await definitions.upsert_window(definition.id, "afternoon")
+        rows = await definitions.list_windows(definition.id)
+        assert [w.window for w in rows] == [
+            "morning",
+            "afternoon",
+            "evening",
+        ]
+        assert rows[1].due_time is None
+        return rows
+
+    _with_db(tmp_path, "definition-window-roundtrip.db")(_body)
+
+
+def test_definition_window_unknown_name_raises(tmp_path) -> None:
+    async def _body(database, rules, definitions, children, child):
+        rule = await rules.create("daily", "2026-09-14")
+        definition = await definitions.create("A", rule.id, NOW)
+        with pytest.raises(ValueError, match="window must be one of"):
+            await definitions.upsert_window(definition.id, "noon")
+        with pytest.raises(ValueError, match="window must be one of"):
+            await definitions.remove_window(definition.id, "MORNING")
+        return None
+
+    _with_db(tmp_path, "definition-window-bad-name.db")(_body)
+
+
+def test_definition_window_bad_due_time_raises(tmp_path) -> None:
+    async def _body(database, rules, definitions, children, child):
+        rule = await rules.create("daily", "2026-09-14")
+        definition = await definitions.create("A", rule.id, NOW)
+        with pytest.raises(ValueError, match="HH:MM"):
+            await definitions.upsert_window(
+                definition.id, "morning", due_time="9:30"
+            )
+        with pytest.raises(ValueError, match="HH:MM"):
+            await definitions.upsert_window(
+                definition.id, "morning", due_time="25:00"
+            )
+        return None
+
+    _with_db(tmp_path, "definition-window-bad-time.db")(_body)
+
+
+def test_definition_window_missing_definition_raises(tmp_path) -> None:
+    async def _body(database, rules, definitions, children, child):
+        with pytest.raises(ValueError, match="does not exist"):
+            await definitions.upsert_window(999, "morning")
+        return None
+
+    _with_db(tmp_path, "definition-window-missing.db")(_body)
+
+
+def test_definition_remove_window_round_trip(tmp_path) -> None:
+    async def _body(database, rules, definitions, children, child):
+        rule = await rules.create("daily", "2026-09-14")
+        definition = await definitions.create("A", rule.id, NOW)
+        await definitions.upsert_window(definition.id, "morning")
+        assert await definitions.remove_window(
+            definition.id, "morning"
+        ) is True
+        assert await definitions.list_windows(definition.id) == []
+        # Removing an absent window reports False.
+        assert await definitions.remove_window(
+            definition.id, "morning"
+        ) is False
+        return None
+
+    _with_db(tmp_path, "definition-window-remove.db")(_body)
+
+
+def test_definition_unassigned_has_no_assignees(tmp_path) -> None:
+    async def _body(database, rules, definitions, children, child):
+        rule = await rules.create("daily", "2026-09-14")
+        definition = await definitions.create("A", rule.id, NOW)
+        assert await definitions.list_assignees(definition.id) == []
+        return None
+
+    _with_db(tmp_path, "definition-no-assignees.db")(_body)
+
+
+def test_definition_shared_by_multiple_children_via_list_by_child(
     tmp_path,
 ) -> None:
-    """Reassignment writes the definition row only: any instances that
-    already exist keep their generation-time child_id (Feature 06
+    """D-008: one definition covering several children appears for
+    every assignee through list_by_child, once each."""
+    async def _body(database, rules, definitions, children, child):
+        rule = await rules.create("daily", "2026-09-14")
+        second = await children.create("Bo", NOW)
+        definition = await definitions.create(
+            "A", rule.id, NOW, assignee_child_ids=[child.id, second.id]
+        )
+        for assignee in (child, second):
+            mine = await definitions.list_by_child(assignee.id)
+            assert [d.id for d in mine] == [definition.id]
+        return definition
+
+    _with_db(tmp_path, "definition-shared.db")(_body)
+
+
+def test_definition_assignment_leaves_history_rows_alone(
+    tmp_path,
+) -> None:
+    """Assignment edits write the assignees table only: any instances
+    that already exist keep their generation-time child_id (Feature 06
     guardrail 'changes future instances only').
     """
     async def _body(database, rules, definitions, children, child):
         rule = await rules.create("daily", "2026-09-14")
         other = await children.create("Bo", NOW)
-        definition = await definitions.create("A", child.id, rule.id, NOW)
+        definition = await definitions.create(
+            "A", rule.id, NOW, assignee_child_ids=[child.id]
+        )
         # Simulate an already-generated instance (materialization owns
-        # this table, but its row shape proves reassignment isolation).
+        # this table, but its row shape proves assignment isolation).
         await database.execute(
             "INSERT INTO quest_instances (definition_id, child_id, "
-            "due_date, generated_at) VALUES (?, ?, ?, ?)",
+            "window, due_date, generated_at) VALUES (?, ?, 'morning', ?, ?)",
             (definition.id, child.id, "2026-09-15", NOW),
         )
-        await definitions.set_assignee(definition.id, other.id)
+        await definitions.add_assignee(definition.id, other.id)
+        await definitions.remove_assignee(definition.id, child.id)
         row = await database.fetch_one(
             "SELECT child_id FROM quest_instances WHERE definition_id = ?",
             (definition.id,),
@@ -801,7 +1231,7 @@ def test_rules_and_definitions_sql_lives_only_in_dao_module() -> None:
     }
     sql_pattern = re.compile(
         r"(FROM|INTO|UPDATE|DELETE\s+FROM|JOIN)\s+[`'\"]*(\[)?"
-        r"(schedule_rules|quest_definitions)\b",
+        r"(schedule_rules|quest_definitions|quest_definition_assignees|quest_definition_windows)\b",
         re.IGNORECASE,
     )
     offenders: list[str] = []
@@ -813,7 +1243,7 @@ def test_rules_and_definitions_sql_lives_only_in_dao_module() -> None:
             if sql_pattern.search(py.read_text()):
                 offenders.append(relative)
     assert offenders == [], (
-        f"SQL touching schedule_rules/quest_definitions leaked into: "
+        f"SQL touching schedule_rules/quest_definitions/assignees leaked: "
         f"{offenders}"
     )
 
@@ -853,7 +1283,7 @@ def test_dao_instances_test_file_uses_dao_not_raw_rules_sql() -> None:
     )
     sql_pattern = re.compile(
         r"(SELECT\s[^\"']*?FROM|INSERT\s+INTO|UPDATE|DELETE\s+FROM|"
-        r"FROM|JOIN)\s+[`'\"]*(\[)?(schedule_rules|quest_definitions)\b",
+        r"FROM|JOIN)\s+[`'\"]*(\[)?(schedule_rules|quest_definitions|quest_definition_assignees|quest_definition_windows)\b",
         re.IGNORECASE,
     )
     assert sql_pattern.search(remaining) is None, (
@@ -898,7 +1328,7 @@ def test_dao_rules_test_file_uses_dao_not_raw_table_sql() -> None:
     )
     sql_pattern = re.compile(
         r"(SELECT\s[^\"']*?FROM|INSERT\s+INTO|UPDATE|DELETE\s+FROM|"
-        r"FROM|JOIN)\s+[`'\"]*(\[)?(schedule_rules|quest_definitions)\b",
+        r"FROM|JOIN)\s+[`'\"]*(\[)?(schedule_rules|quest_definitions|quest_definition_assignees|quest_definition_windows)\b",
         re.IGNORECASE,
     )
     assert sql_pattern.search(remaining) is None, (

tests/test_lifecycle.py

@@ -8,7 +8,13 @@ import pytest
 from conftest import make_config_entry, make_hass, wire_entry_to_registry
 
 from custom_components.nestquest import DOMAIN, async_setup_entry, async_unload_entry
-from custom_components.nestquest.const import DOMAIN as DOMAIN_CONST
+from custom_components.nestquest.const import (
+    CONF_DAY_ROLLOVER_TIME,
+    CONF_HORIZON_DAYS,
+    DEFAULT_HORIZON_DAYS,
+    SERVICE_REGENERATE,
+    DOMAIN as DOMAIN_CONST,
+)
 
 
 def _wire(entry, registry):
@@ -237,6 +243,163 @@ async def test_unload_closes_database_even_when_listener_removal_raises() -> Non
     assert database.connected is False, "database leaked despite remover error"
     assert entry.runtime_data is None
     assert DOMAIN not in hass.data
+    assert hass.time_change.size == 0, "time-change listener leaked"
+
+
+async def test_unload_cancels_time_listener_even_when_update_remover_raises() -> None:
+    """A raising update-listener remover must not skip the time-change cancel.
+
+    Both removers are independent: the update-listener remover raising must
+    still cancel the daily time-change callback, whose action would otherwise
+    fire after unload against a closed database.
+    """
+
+    class _RemoveBoom(Exception):
+        pass
+
+    def _remover():
+        raise _RemoveBoom()
+
+    entry = make_config_entry(entry_id="update-boom-time-cancel")
+    entry.add_update_listener = lambda listener: _remover
+    hass, _registry = make_hass()
+    await async_setup_entry(hass, entry)
+    assert hass.time_change.size == 1
+    with pytest.raises(_RemoveBoom):
+        await async_unload_entry(hass, entry)
+    assert hass.time_change.size == 0, "time-change listener not cancelled"
+    assert entry.runtime_data is None
+    assert DOMAIN not in hass.data
+
+
+async def test_setup_registers_day_rollover_listener(hass, make_entry) -> None:
+    """Setup registers a daily rollover listener and stores its cancel fn."""
+    entry = _wire(make_entry(), hass.registry)
+    assert await async_setup_entry(hass, entry) is True
+    assert hass.time_change.size == 1
+    registration = hass.time_change.registrations[0]
+    assert registration["hour"] == 0
+    assert registration["minute"] == 0
+    assert callable(entry.runtime_data.remove_time_change_listener)
+
+
+async def test_setup_registers_day_rollover_at_configured_time(hass, make_entry) -> None:
+    """The listener fires at the entry option's rollover time, not the default."""
+    entry = _wire(make_entry(options={CONF_DAY_ROLLOVER_TIME: "06:30"}), hass.registry)
+    await async_setup_entry(hass, entry)
+    registration = hass.time_change.registrations[0]
+    assert registration["hour"] == 6
+    assert registration["minute"] == 30
+
+
+async def test_unload_cancels_day_rollover_listener(hass, make_entry) -> None:
+    """Unload removes the time-change listener alongside the update listener."""
+    entry = _wire(make_entry(), hass.registry)
+    await async_setup_entry(hass, entry)
+    assert hass.time_change.size == 1
+    assert await async_unload_entry(hass, entry) is True
+    assert hass.time_change.size == 0
+
+
+async def test_rollover_time_change_reregisters_listener_at_new_time(
+    hass, make_entry
+) -> None:
+    """A rollover-time options change re-registers the listener at the new time."""
+    entry = _wire(
+        make_entry(options={CONF_DAY_ROLLOVER_TIME: "00:00"}), hass.registry
+    )
+    await async_setup_entry(hass, entry)
+    assert (hass.time_change.registrations[0]["hour"], hass.time_change.registrations[0]["minute"]) == (0, 0)
+
+    # The options flow writes the new rollover time, then HA reloads the
+    # entry: unload tears down the old listener, setup re-registers it.
+    entry.options = {CONF_DAY_ROLLOVER_TIME: "06:30"}
+    await async_unload_entry(hass, entry)
+    assert hass.time_change.size == 0
+
+    assert await async_setup_entry(hass, entry) is True
+    assert hass.time_change.size == 1
+    registration = hass.time_change.registrations[0]
+    assert (registration["hour"], registration["minute"]) == (6, 30)
+
+
+async def test_day_rollover_listener_materializes_ha_local_horizon(
+    hass, make_entry, monkeypatch
+) -> None:
+    """Firing the listener materializes today..today+horizon in HA local time."""
+    import datetime
+    from unittest.mock import AsyncMock
+    from zoneinfo import ZoneInfo
+
+    import custom_components.nestquest as nestquest
+
+    entry = _wire(make_entry(), hass.registry)
+    await async_setup_entry(hass, entry)
+    database = entry.runtime_data.database
+
+    fake = AsyncMock()
+    monkeypatch.setattr(nestquest, "_materialize_run", fake)
+
+    time_zone = ZoneInfo(hass.config.time_zone)
+    today = datetime.datetime.now(time_zone).date()
+    expected_start = today.isoformat()
+    expected_end = (today + datetime.timedelta(days=DEFAULT_HORIZON_DAYS)).isoformat()
+
+    await hass.time_change.fire()
+
+    fake.assert_awaited_once_with(
+        database, expected_start, expected_end, today=today
+    )
+
+
+async def test_day_rollover_uses_configured_horizon_days(hass, make_entry) -> None:
+    """The daily run materializes only the configured horizon window."""
+    import datetime
+
+    from custom_components.nestquest.dao_instances import QuestInstancesDao
+
+    entry = _wire(make_entry(options={CONF_HORIZON_DAYS: 5}), hass.registry)
+    assert await async_setup_entry(hass, entry) is True
+    database = entry.runtime_data.database
+
+    # A definition created AFTER setup has no instances yet (create does not
+    # materialize); firing the daily listener must generate only the horizon.
+    child_id = await _seed_daily_child_and_definition(
+        database, _local_today(hass)
+    )
+    await hass.time_change.fire()
+
+    today = _local_today(hass)
+    end = (today + datetime.timedelta(days=5)).isoformat()
+    records = await QuestInstancesDao(database).list_by_date_range(
+        child_id, today.isoformat(), end
+    )
+    assert len(records) == 6
+
+    beyond = (today + datetime.timedelta(days=6)).isoformat()
+    beyond_end = (
+        today + datetime.timedelta(days=DEFAULT_HORIZON_DAYS)
+    ).isoformat()
+    assert await QuestInstancesDao(database).list_by_date_range(
+        child_id, beyond, beyond_end
+    ) == []
+
+
+def test_day_rollover_time_change_tracker_rejects_local_kwarg() -> None:
+    """The fake async_track_time_change mirrors HA 2024.6 (no ``local`` kwarg).
+
+    Setup drives the local-time wrapper directly, so passing ``local=`` must
+    raise TypeError — otherwise a regression in the production call would be
+    silently masked by the fake.
+    """
+    import inspect as _inspect
+
+    from homeassistant.helpers.event import async_track_time_change
+
+    params = _inspect.signature(async_track_time_change).parameters
+    assert list(params) == ["hass", "action", "hour", "minute", "second"]
+    with pytest.raises(TypeError):
+        async_track_time_change(None, lambda _now: None, hour=0, minute=0, local=True)
 
 
 async def test_setup_applies_all_v1_tables(hass, make_entry) -> None:
@@ -255,4 +418,264 @@ async def test_setup_applies_all_v1_tables(hass, make_entry) -> None:
         "quest_definitions",
         "schedule_rules",
     ]
-    await async_unload_entry(hass, entry)
+    await async_unload_entry(hass, entry)
+
+
+async def _seed_daily_child_and_definition(database, today) -> int:
+    """Create one always-present child + a daily definition starting today.
+
+    Returns the child's id.  No presence schedule means the child is present
+    every day, so the daily rule yields exactly one instance per horizon day.
+    """
+    from custom_components.nestquest.dao_children import ChildrenDao
+    from custom_components.nestquest.quest_definitions import (
+        create_quest_definition,
+    )
+    from custom_components.nestquest.recurrence import RuleType, ScheduleRule
+
+    NOW = "2026-09-14T12:00:00+00:00"
+    child = await ChildrenDao(database).create("Ada", NOW)
+    await create_quest_definition(
+        database,
+        "Daily chore",
+        ScheduleRule(rule_type=RuleType.DAILY, start_date=today.isoformat()),
+        [child.id],
+        ["morning"],
+    )
+    return child.id
+
+
+def _local_today(hass) -> "datetime.date":
+    import datetime
+    from zoneinfo import ZoneInfo
+
+    return datetime.datetime.now(ZoneInfo(hass.config.time_zone)).date()
+
+
+async def test_setup_backfills_instances_over_horizon(hass, make_entry) -> None:
+    """Setup materializes once so a restart backfills any missed days."""
+    import datetime
+
+    from custom_components.nestquest.dao_instances import QuestInstancesDao
+    from custom_components.nestquest.db import NestQuestDatabase
+    from custom_components.nestquest.migrations import apply_migrations
+    from custom_components.nestquest.store import async_get_db_path
+
+    # Seed the database BEFORE setup: a restart reopens an existing file that
+    # already holds definitions.  The startup backfill must pick them up.
+    db_path = await async_get_db_path(hass)
+    pre = NestQuestDatabase(hass)
+    await pre.open(db_path)
+    await apply_migrations(pre)
+    child_id = await _seed_daily_child_and_definition(pre, _local_today(hass))
+    await pre.close()
+
+    entry = _wire(make_entry(), hass.registry)
+    assert await async_setup_entry(hass, entry) is True
+
+    today = _local_today(hass)
+    end = (today + datetime.timedelta(days=DEFAULT_HORIZON_DAYS)).isoformat()
+    records = await QuestInstancesDao(entry.runtime_data.database).list_by_date_range(
+        child_id, today.isoformat(), end
+    )
+    assert len(records) == DEFAULT_HORIZON_DAYS + 1
+
+
+async def test_setup_backfills_configured_horizon_days(hass, make_entry) -> None:
+    """Setup backfills only the configured (non-default) horizon window."""
+    import datetime
+
+    from custom_components.nestquest.dao_instances import QuestInstancesDao
+    from custom_components.nestquest.db import NestQuestDatabase
+    from custom_components.nestquest.migrations import apply_migrations
+    from custom_components.nestquest.store import async_get_db_path
+
+    db_path = await async_get_db_path(hass)
+    pre = NestQuestDatabase(hass)
+    await pre.open(db_path)
+    await apply_migrations(pre)
+    child_id = await _seed_daily_child_and_definition(pre, _local_today(hass))
+    await pre.close()
+
+    entry = _wire(
+        make_entry(options={CONF_HORIZON_DAYS: 5}), hass.registry
+    )
+    assert await async_setup_entry(hass, entry) is True
+
+    today = _local_today(hass)
+    end = (today + datetime.timedelta(days=5)).isoformat()
+    records = await QuestInstancesDao(
+        entry.runtime_data.database
+    ).list_by_date_range(child_id, today.isoformat(), end)
+    assert len(records) == 6
+
+    beyond = (today + datetime.timedelta(days=6)).isoformat()
+    beyond_end = (
+        today + datetime.timedelta(days=DEFAULT_HORIZON_DAYS)
+    ).isoformat()
+    assert await QuestInstancesDao(
+        entry.runtime_data.database
+    ).list_by_date_range(child_id, beyond, beyond_end) == []
+
+
+def test_configured_horizon_days_validates_and_falls_back() -> None:
+    """The configured horizon is validated; a malformed value uses the default."""
+    import custom_components.nestquest as nestquest
+
+    assert nestquest._configured_horizon_days({CONF_HORIZON_DAYS: 5}) == 5
+    assert nestquest._configured_horizon_days({}) == DEFAULT_HORIZON_DAYS
+    assert (
+        nestquest._configured_horizon_days({CONF_HORIZON_DAYS: True})
+        == DEFAULT_HORIZON_DAYS
+    )
+    assert (
+        nestquest._configured_horizon_days({CONF_HORIZON_DAYS: "5"})
+        == DEFAULT_HORIZON_DAYS
+    )
+    assert (
+        nestquest._configured_horizon_days({CONF_HORIZON_DAYS: 0})
+        == DEFAULT_HORIZON_DAYS
+    )
+
+
+async def test_regenerate_service_registered_and_materializes(
+    hass, make_entry
+) -> None:
+    """``nestquest.regenerate`` is registered and calling it regenerates."""
+    import datetime
+
+    from custom_components.nestquest.dao_instances import QuestInstancesDao
+
+    entry = _wire(make_entry(), hass.registry)
+    assert await async_setup_entry(hass, entry) is True
+    assert hass.services.has_service(DOMAIN, SERVICE_REGENERATE)
+
+    # A definition created AFTER setup has no instances yet (create does not
+    # materialize); the service must generate them on demand.
+    database = entry.runtime_data.database
+    child_id = await _seed_daily_child_and_definition(database, _local_today(hass))
+
+    await hass.services.call(DOMAIN, SERVICE_REGENERATE)
+
+    today = _local_today(hass)
+    end = (today + datetime.timedelta(days=DEFAULT_HORIZON_DAYS)).isoformat()
+    records = await QuestInstancesDao(database).list_by_date_range(
+        child_id, today.isoformat(), end
+    )
+    assert len(records) == DEFAULT_HORIZON_DAYS + 1
+
+
+async def test_regenerate_service_uses_configured_horizon_days(
+    hass, make_entry
+) -> None:
+    """``nestquest.regenerate`` regenerates only the configured horizon."""
+    import datetime
+
+    from custom_components.nestquest.dao_instances import QuestInstancesDao
+
+    entry = _wire(
+        make_entry(options={CONF_HORIZON_DAYS: 5}), hass.registry
+    )
+    assert await async_setup_entry(hass, entry) is True
+
+    database = entry.runtime_data.database
+    child_id = await _seed_daily_child_and_definition(database, _local_today(hass))
+
+    await hass.services.call(DOMAIN, SERVICE_REGENERATE)
+
+    today = _local_today(hass)
+    end = (today + datetime.timedelta(days=5)).isoformat()
+    records = await QuestInstancesDao(database).list_by_date_range(
+        child_id, today.isoformat(), end
+    )
+    assert len(records) == 6
+
+    beyond = (today + datetime.timedelta(days=6)).isoformat()
+    beyond_end = (
+        today + datetime.timedelta(days=DEFAULT_HORIZON_DAYS)
+    ).isoformat()
+    assert await QuestInstancesDao(database).list_by_date_range(
+        child_id, beyond, beyond_end
+    ) == []
+
+
+async def test_unload_deregisters_regenerate_service(hass, make_entry) -> None:
+    """Unload removes the ``regenerate`` service so no stale entry leaks."""
+    entry = _wire(make_entry(), hass.registry)
+    assert await async_setup_entry(hass, entry) is True
+    assert hass.services.has_service(DOMAIN, SERVICE_REGENERATE)
+
+    assert await async_unload_entry(hass, entry) is True
+    assert not hass.services.has_service(DOMAIN, SERVICE_REGENERATE)
+
+
+async def test_regenerate_service_is_domain_scoped_across_entries(
+    hass, make_entry
+) -> None:
+    """The ``regenerate`` service is domain-global, not per-entry.
+
+    With two loaded entries the service must be registered and functional;
+    unloading one entry must keep it registered and functional for the
+    remaining entry; unloading the final entry must remove it.
+    """
+    import datetime
+
+    from custom_components.nestquest.dao_instances import QuestInstancesDao
+
+    entry_a = _wire(make_entry(entry_id="entry_a"), hass.registry)
+    entry_b = _wire(make_entry(entry_id="entry_b"), hass.registry)
+
+    assert await async_setup_entry(hass, entry_a) is True
+    assert await async_setup_entry(hass, entry_b) is True
+    assert hass.services.has_service(DOMAIN, SERVICE_REGENERATE)
+
+    # The domain-global handler resolves a live database from any entry.
+    database_b = entry_b.runtime_data.database
+    child_id = await _seed_daily_child_and_definition(
+        database_b, _local_today(hass)
+    )
+    await hass.services.call(DOMAIN, SERVICE_REGENERATE)
+    today = _local_today(hass)
+    end = (today + datetime.timedelta(days=DEFAULT_HORIZON_DAYS)).isoformat()
+    records = await QuestInstancesDao(database_b).list_by_date_range(
+        child_id, today.isoformat(), end
+    )
+    assert len(records) == DEFAULT_HORIZON_DAYS + 1
+
+    # Unloading one entry must not tear down the shared service.
+    assert await async_unload_entry(hass, entry_a) is True
+    assert hass.services.has_service(DOMAIN, SERVICE_REGENERATE)
+
+    # It still works for the remaining entry.
+    await hass.services.call(DOMAIN, SERVICE_REGENERATE)
+
+    # Unloading the final entry removes the domain-global service.
+    assert await async_unload_entry(hass, entry_b) is True
+    assert not hass.services.has_service(DOMAIN, SERVICE_REGENERATE)
+
+
+async def test_setup_cleans_listeners_when_materialization_raises(
+    hass, make_entry, monkeypatch
+) -> None:
+    """A startup-materialization failure rolls back every registered listener.
+
+    The daily and update listeners are installed before the startup
+    materialization runs; when that walk raises, the database is closed but
+    the remover callables must also be invoked so no listener survives
+    firing against a closed database.
+    """
+    import custom_components.nestquest as nestquest
+
+    async def _boom(*_args, **_kwargs):
+        raise RuntimeError("materialization failed")
+
+    monkeypatch.setattr(nestquest, "_materialize_run", _boom)
+
+    entry = _wire(make_entry(), hass.registry)
+    with pytest.raises(RuntimeError, match="materialization failed"):
+        await async_setup_entry(hass, entry)
+
+    assert hass.time_change.size == 0
+    assert hass.registry.size == 0
+    assert not hass.services.has_service(DOMAIN, SERVICE_REGENERATE)
+    assert not hasattr(entry, "runtime_data")

tests/test_migrations.py

@@ -17,7 +17,10 @@ from custom_components.nestquest.migrations import (
     apply_migrations,
     read_schema_version,
 )
-from custom_components.nestquest.schema import SCHEMA_V1_STATEMENTS
+from custom_components.nestquest.schema import (
+    SCHEMA_V1_STATEMENTS,
+    SCHEMA_V1_QUEST_DEFINITION_WINDOWS_DDL,
+)
 
 
 def _run(coro):
@@ -63,6 +66,8 @@ def _counts(database) -> dict[str, int]:
         "admin_users",
         "schedule_rules",
         "quest_definitions",
+        "quest_definition_assignees",
+        "quest_definition_windows",
         "presence_schedules",
         "presence_overrides",
         "quest_instances",
@@ -99,6 +104,8 @@ def test_fresh_file_migration_creates_all_v1_tables(tmp_path) -> None:
             "admin_users",
             "schedule_rules",
             "quest_definitions",
+            "quest_definition_assignees",
+            "quest_definition_windows",
             "presence_schedules",
             "presence_overrides",
             "quest_instances",
@@ -136,15 +143,23 @@ def test_empty_version_table_reads_as_version_0(tmp_path) -> None:
 
 
 def test_migration_list_shape() -> None:
-    """Migration 1 is the v1 DDL; migration 2 is the legacy rename step.
+    """Migration 1 is the v1 DDL; 2 and 3 are callable steps.
 
     Nothing ever shipped, so migration 1 was rewritten pre-release
     (D-007) to create the quest_* tables directly; migration 2 exists
-    for dev databases stamped version 1 by the pre-rename runner.
+    for dev databases stamped version 1 by the pre-rename runner,
+    migration 3 brings pre-D-008 definitions to the multi-assignee
+    model, migration 4 adds the windows table, migration 5 rebuilds
+    quest_instances onto the widened (definition, child, date, window)
+    key, and migration 6 adds actor_child_id to completion_events.
     """
     assert MIGRATIONS[0] == SCHEMA_V1_STATEMENTS
     assert callable(MIGRATIONS[1])
-    assert len(MIGRATIONS) == 2
+    assert callable(MIGRATIONS[2])
+    assert MIGRATIONS[3] == SCHEMA_V1_QUEST_DEFINITION_WINDOWS_DDL
+    assert callable(MIGRATIONS[4])
+    assert callable(MIGRATIONS[5])
+    assert len(MIGRATIONS) == 6
 
 
 # ---------------------------------------------------------------------------
@@ -312,6 +327,20 @@ def test_legacy_task_tables_are_renamed_and_keep_their_rows(tmp_path) -> None:
             )
             == ("2026-09-15",)
         )
+        # Migration 3 moved the legacy single-assignee column into the
+        # assignees table: the definition kept its child, the column is
+        # gone.
+        assignees = _run(
+            database.fetch_one(
+                "SELECT child_id FROM quest_definition_assignees "
+                "WHERE definition_id = 1"
+            )
+        )
+        assert assignees == (1,)
+        columns = _run(
+            database.fetch_all("PRAGMA table_info(quest_definitions)")
+        )
+        assert "child_id" not in {row[1] for row in columns}
         # The untouched completion_events table still exists and is empty.
         assert "completion_events" in tables
         assert (
@@ -380,6 +409,231 @@ def test_fresh_database_never_holds_legacy_table_names(tmp_path) -> None:
         _run(database.close())
 
 
+# ---------------------------------------------------------------------------
+# Pre-D-008 database: quest_definitions with child_id stamped version 2
+# ---------------------------------------------------------------------------
+
+_V2_DEFINITIONS_DDL = [
+    """
+    CREATE TABLE IF NOT EXISTS quest_definitions (
+        id INTEGER PRIMARY KEY AUTOINCREMENT,
+        title TEXT NOT NULL,
+        description TEXT,
+        icon TEXT,
+        child_id INTEGER NOT NULL REFERENCES children(id),
+        schedule_rule_id INTEGER NOT NULL REFERENCES schedule_rules(id),
+        due_time TEXT,
+        is_active INTEGER NOT NULL DEFAULT 1,
+        created_at TEXT NOT NULL
+    )
+    """,
+]
+
+_V2_INSTANCES_DDL = [
+    """
+    CREATE TABLE IF NOT EXISTS quest_instances (
+        id INTEGER PRIMARY KEY AUTOINCREMENT,
+        definition_id INTEGER NOT NULL REFERENCES quest_definitions(id),
+        child_id INTEGER NOT NULL REFERENCES children(id),
+        due_date TEXT NOT NULL,
+        due_time TEXT,
+        generated_at TEXT NOT NULL,
+        UNIQUE (definition_id, due_date)
+    )
+    """,
+]
+
+_V2_EVENTS_DDL = [
+    """
+    CREATE TABLE IF NOT EXISTS completion_events (
+        id INTEGER PRIMARY KEY AUTOINCREMENT,
+        instance_id INTEGER NOT NULL REFERENCES quest_instances(id),
+        child_id INTEGER NOT NULL REFERENCES children(id),
+        event_type TEXT NOT NULL,
+        actor_source TEXT NOT NULL,
+        actor_user_id TEXT,
+        occurred_at TEXT NOT NULL,
+        was_on_time INTEGER
+    )
+    """,
+]
+
+
+def _seed_v2_multi_assignee_upgrade(database) -> None:
+    """Create a database shaped like a post-rename, pre-D-008 dev file.
+
+    Fresh quest_* tables — but quest_definitions still carries the
+    single child_id column and no assignees table exists — stamped at
+    version 2, with definition and instance rows that must survive.
+    """
+    # Freeze the version-2 shape: definitions carry child_id, the
+    # instance table has no window column, and the assignees/windows
+    # tables do not exist yet — everything else matches the current DDL.
+    _v2_replaced = (
+        "quest_definitions ",
+        "quest_definition_assignees ",
+        "quest_definition_windows ",
+        "quest_instances ",
+        "completion_events ",
+    )
+    for sql in SCHEMA_V1_STATEMENTS:
+        if any(name in sql for name in _v2_replaced):
+            continue
+        _run(database.execute(sql))
+    for sql in _V2_DEFINITIONS_DDL + _V2_INSTANCES_DDL + _V2_EVENTS_DDL:
+        _run(database.execute(sql))
+    _run(database.execute(VERSION_TABLE_DDL))
+    _run(
+        database.execute(
+            f"INSERT INTO {VERSION_TABLE} (id, version) VALUES (1, 2)"
+        )
+    )
+    _run(
+        database.execute(
+            "INSERT INTO children (display_name, created_at) "
+            "VALUES ('Ada', '2026-09-14T00:00:00+00:00')"
+        )
+    )
+    _run(
+        database.execute(
+            "INSERT INTO children (display_name, created_at) "
+            "VALUES ('Bo', '2026-09-14T00:00:00+00:00')"
+        )
+    )
+    _run(
+        database.execute(
+            "INSERT INTO schedule_rules (rule_type, start_date) "
+            "VALUES ('daily', '2026-09-14')"
+        )
+    )
+    _run(
+        database.execute(
+            "INSERT INTO quest_definitions (title, child_id, "
+            "schedule_rule_id, created_at) "
+            "VALUES ('Dishes', 2, 1, '2026-09-14T00:00:00+00:00')"
+        )
+    )
+    _run(
+        database.execute(
+            "INSERT INTO quest_instances (definition_id, child_id, "
+            "due_date, generated_at) "
+            "VALUES (1, 2, '2026-09-15', '2026-09-14T00:00:00+00:00')"
+        )
+    )
+    # One legacy panel event and one legacy admin event: the panel one
+    # must backfill actor_child_id to its own child; the admin one must
+    # stay NULL.
+    _run(
+        database.execute(
+            "INSERT INTO completion_events (instance_id, child_id, "
+            "event_type, actor_source, occurred_at, was_on_time) "
+            "VALUES (1, 2, 'completed', 'panel', "
+            "'2026-09-15T10:00:00+00:00', 1)"
+        )
+    )
+    _run(
+        database.execute(
+            "INSERT INTO completion_events (instance_id, child_id, "
+            "event_type, actor_source, actor_user_id, occurred_at, "
+            "was_on_time) "
+            "VALUES (1, 2, 'uncompleted', 'user', 'parent-1', "
+            "'2026-09-15T11:00:00+00:00', 1)"
+        )
+    )
+
+
+def test_v2_definitions_rebuilt_to_multi_assignee(tmp_path) -> None:
+    database = _open_db(tmp_path / "v2-upgrade.db")
+    try:
+        _seed_v2_multi_assignee_upgrade(database)
+        final = _migrate(database)
+        assert final == len(MIGRATIONS)
+        assert _version(database) == len(MIGRATIONS)
+        # The definition row survived and lost its child_id column.
+        row = _run(
+            database.fetch_one(
+                "SELECT title, schedule_rule_id, is_active "
+                "FROM quest_definitions WHERE id = 1"
+            )
+        )
+        assert row == ("Dishes", 1, 1)
+        columns = _run(
+            database.fetch_all("PRAGMA table_info(quest_definitions)")
+        )
+        assert "child_id" not in {c[1] for c in columns}
+        # The single assignee moved into the assignees table.
+        assignees = _run(
+            database.fetch_all(
+                "SELECT definition_id, child_id "
+                "FROM quest_definition_assignees ORDER BY child_id"
+            )
+        )
+        assert assignees == [(1, 2)]
+        # The instance survived the rebuild, pinned to the migrated
+        # window, still referencing the definition.
+        instance = _run(
+            database.fetch_one(
+                "SELECT definition_id, child_id, window, due_date "
+                "FROM quest_instances WHERE id = 1"
+            )
+        )
+        assert instance == (1, 2, "morning", "2026-09-15")
+        # The rebuilt instance table carries the widened unique key.
+        index_rows = _run(
+            database.fetch_all(
+                "PRAGMA index_list(quest_instances)"
+            )
+        )
+        unique_columns = []
+        for index_row in index_rows:
+            if index_row[2]:  # unique flag
+                info = _run(
+                    database.fetch_all(
+                        f"PRAGMA index_info('{index_row[1]}')"
+                    )
+                )
+                unique_columns.append([col[2] for col in info])
+        assert [
+            "definition_id", "child_id", "due_date", "window"
+        ] in unique_columns
+        # The completion events survived the actor_child_id rebuild:
+        # the panel row backfilled to its own child, the admin row
+        # stayed NULL, and ids are preserved.
+        events = _run(
+            database.fetch_all(
+                "SELECT id, event_type, actor_source, actor_child_id "
+                "FROM completion_events ORDER BY id"
+            )
+        )
+        assert events == [
+            (1, "completed", "panel", 2),
+            (2, "uncompleted", "user", None),
+        ]
+        columns = _run(
+            database.fetch_all("PRAGMA table_info(completion_events)")
+        )
+        assert "actor_child_id" in {c[1] for c in columns}
+        # No dangling references anywhere.
+        assert _run(database.fetch_all("PRAGMA foreign_key_check")) == []
+        # The rebuilt table is live for the new model: a definition
+        # insert carries no child column at all.
+        _run(
+            database.execute(
+                "INSERT INTO quest_definitions (title, schedule_rule_id, "
+                "created_at) VALUES ('Laundry', 1, "
+                "'2026-09-14T00:00:00+00:00')"
+            )
+        )
+        _run(
+            database.execute(
+                "INSERT INTO quest_definition_assignees "
+                "(definition_id, child_id) VALUES (2, 1)"
+            )
+        )
+    finally:
+        _run(database.close())
+
+
 # ---------------------------------------------------------------------------
 # Idempotence: second start is a no-op
 # ---------------------------------------------------------------------------
@@ -481,22 +735,28 @@ def test_noop_run_is_logged_at_debug_level(caplog, tmp_path) -> None:
 
 
 def _failing_migrations(prior_statements: list[str]) -> list[list[str]]:
-    """Three-migration list where migration 3 fails mid-application.
+    """Migration list where the LAST entry fails mid-application.
 
-    Migration 2 is a harmless no-op filler so the real runner — which
-    has already stamped version 2 by the time these tests re-run it —
-    still has a pending migration to fail on.
+    Sized one entry longer than the real MIGRATIONS and padded with
+    harmless no-op fillers, so a fully-migrated database (already at
+    len(MIGRATIONS)) still has exactly one pending migration — the
+    failing one — to attempt.
     """
-    return [
-        prior_statements,
+    steps: list[list[str]] = [prior_statements]
+    steps += [
         [
-            "CREATE TABLE IF NOT EXISTS filler_table (id INTEGER PRIMARY KEY)"
-        ],
+            f"CREATE TABLE IF NOT EXISTS filler_{index} "
+            "(id INTEGER PRIMARY KEY)"
+        ]
+        for index in range(len(MIGRATIONS) - 1)
+    ]
+    steps.append(
         [
             "CREATE TABLE IF NOT EXISTS later_table (id INTEGER PRIMARY KEY)",
             "CREATE TABLE broken (",
-        ],
-    ]
+        ]
+    )
+    return steps
 
 
 def test_failing_migration_rolls_back_to_prior_version(tmp_path) -> None:

tests/test_options_flow.py

@@ -14,6 +14,7 @@ from conftest import make_config_entry, make_hass, options_flow_base as _options
 from custom_components.nestquest import config_flow
 from custom_components.nestquest import options_flow
 from custom_components.nestquest.const import (
+    CONF_ADMIN_USER_IDS,
     CONF_DAY_ROLLOVER_TIME,
     CONF_HORIZON_DAYS,
     CONF_PANEL_IDLE_TIMEOUT,
@@ -46,13 +47,48 @@ def _make_entry(entry_id: str = "test_entry", options: dict | None = None, data:
     return make_config_entry(entry_id=entry_id, options=options, data=data)
 
 
-def _make_flow(entry) -> options_flow.NestQuestOptionsFlow:
-    """Create an options flow instance bound to a stubbed config entry."""
+def _make_flow(entry, *, users=None, database=None) -> options_flow.NestQuestOptionsFlow:
+    """Create an options flow instance bound to a stubbed config entry.
+
+    ``users`` populates a stubbed hass.auth for the admin picker;
+    ``database`` wires the runtime record so the flow can read and
+    write the allowlist like real HA's options flow does.
+    """
+    from unittest.mock import AsyncMock
+
     flow = options_flow.NestQuestOptionsFlow(config_entry=entry)
     flow.hass = SimpleNamespace()
+    flow.hass.auth = SimpleNamespace(
+        async_get_users=AsyncMock(return_value=users or [])
+    )
+    if database is not None:
+        from custom_components.nestquest.const import DOMAIN
+
+        flow.hass.data = {
+            DOMAIN: {entry.entry_id: SimpleNamespace(database=database)}
+        }
     return flow
 
 
+def _user(user_id: str, name: str):
+    return SimpleNamespace(id=user_id, name=name)
+
+
+def _open_allowlist_db(tmp_path, name):
+    """A real migrated temp database for the flow to read and write."""
+    from unittest.mock import AsyncMock, MagicMock
+
+    from custom_components.nestquest.db import NestQuestDatabase
+    from custom_components.nestquest.migrations import apply_migrations
+
+    hass = MagicMock()
+    hass.async_add_executor_job = AsyncMock(side_effect=(lambda fn, *a: fn(*a)))
+    database = NestQuestDatabase(hass)
+    _run(database.open(tmp_path / name))
+    _run(apply_migrations(database))
+    return database
+
+
 def _schema_values(schema) -> dict:
     """Extract the per-field default values from a real voluptuous schema."""
     return {
@@ -161,7 +197,12 @@ def test_options_flow_falls_back_to_entry_data() -> None:
 
 
 def test_options_flow_schema_applies_stored_defaults() -> None:
-    """A real voluptuous validate({}) fills every field from the stored defaults."""
+    """A real voluptuous validate({}) fills every field from the stored defaults.
+
+    Without a runtime database (and no auth in the bare harness), the
+    admin picker's default is the empty selection and its choice set is
+    empty — the three legacy settings are unaffected.
+    """
     entry = _make_entry(
         options={
             CONF_HORIZON_DAYS: 21,
@@ -174,6 +215,7 @@ def test_options_flow_schema_applies_stored_defaults() -> None:
         CONF_HORIZON_DAYS: 21,
         CONF_DAY_ROLLOVER_TIME: "05:45",
         CONF_PANEL_IDLE_TIMEOUT: 120,
+        CONF_ADMIN_USER_IDS: [],
     }
 
 
@@ -373,4 +415,223 @@ def test_options_flow_no_hardcoded_domain_or_db_filename() -> None:
             )
             assert node.value != "nestquest.db", (
                 f"Hard-coded database filename in {py_file.name}:{node.lineno}"
-            )
+            )
+
+# ---------------------------------------------------------------------------
+# Admin allowlist picker (Feature 03)
+# ---------------------------------------------------------------------------
+
+
+def test_options_flow_picker_lists_existing_users(tmp_path) -> None:
+    """The picker offers EXISTING HA users (id -> name), never free text."""
+    import voluptuous as vol
+
+    database = _open_allowlist_db(tmp_path, "picker-users.db")
+    try:
+        from custom_components.nestquest.admin_allowlist import set_admin_ids
+
+        _run(set_admin_ids(database, ["u1"]))
+        entry = _make_entry()
+        flow = _make_flow(
+            entry,
+            users=[_user("u1", "Joshua"), _user("u2", "Sam")],
+            database=database,
+        )
+        result = _run(flow.async_step_init(None))
+        schema = result["data_schema"]
+        marker = next(
+            m for m in schema.schema
+            if getattr(m, "schema", None) == CONF_ADMIN_USER_IDS
+        )
+        # Default is the CURRENT database allowlist.
+        values = _schema_values(schema)
+        assert values[CONF_ADMIN_USER_IDS] == ["u1"]
+        # Both users are selectable; an unknown id is rejected by the
+        # schema itself (this is what real HA submits go through).
+        validated = schema(
+            {
+                CONF_HORIZON_DAYS: 7,
+                CONF_DAY_ROLLOVER_TIME: "03:30",
+                CONF_PANEL_IDLE_TIMEOUT: 60,
+                CONF_ADMIN_USER_IDS: ["u1", "u2"],
+            }
+        )
+        assert validated[CONF_ADMIN_USER_IDS] == ["u1", "u2"]
+        with pytest.raises(vol.Invalid):
+            schema(
+                {
+                    CONF_HORIZON_DAYS: 7,
+                    CONF_DAY_ROLLOVER_TIME: "03:30",
+                    CONF_PANEL_IDLE_TIMEOUT: 60,
+                    CONF_ADMIN_USER_IDS: ["impostor"],
+                }
+            )
+    finally:
+        _run(database.close())
+
+
+def test_options_flow_submit_applies_selection_to_database(tmp_path) -> None:
+    database = _open_allowlist_db(tmp_path, "picker-apply.db")
+    try:
+        from custom_components.nestquest.admin_allowlist import (
+            list_admin_ids,
+            set_admin_ids,
+        )
+
+        _run(set_admin_ids(database, ["u1"]))
+        entry = _make_entry()
+        flow = _make_flow(
+            entry,
+            users=[_user("u1", "Joshua"), _user("u2", "Sam")],
+            database=database,
+        )
+        result = _run(
+            flow.async_step_init({**VALID_INPUT, CONF_ADMIN_USER_IDS: ["u2"]})
+        )
+        assert result["type"] == "create_entry"
+        assert result["data"][CONF_ADMIN_USER_IDS] == ["u2"]
+        # The allowlist (and the entry's recovery copy) carry the pick.
+        assert await_gather(list_admin_ids(database)) == ["u2"]
+    finally:
+        _run(database.close())
+
+
+def await_gather(coro):
+    return _run(coro)
+
+
+def test_options_flow_empty_selection_refused(tmp_path) -> None:
+    """Saving zero admins is refused: an empty allowlist fails closed."""
+    database = _open_allowlist_db(tmp_path, "picker-empty.db")
+    try:
+        from custom_components.nestquest.admin_allowlist import (
+            list_admin_ids,
+            set_admin_ids,
+        )
+
+        _run(set_admin_ids(database, ["u1"]))
+        entry = _make_entry()
+        flow = _make_flow(
+            entry,
+            users=[_user("u1", "Joshua")],
+            database=database,
+        )
+        result = _run(
+            flow.async_step_init({**VALID_INPUT, CONF_ADMIN_USER_IDS: []})
+        )
+        assert result["type"] == "form"
+        assert result["errors"] == {CONF_ADMIN_USER_IDS: "no_admins"}
+        assert await_gather(list_admin_ids(database)) == ["u1"]
+    finally:
+        _run(database.close())
+
+
+def test_options_flow_unknown_selection_refused(tmp_path) -> None:
+    database = _open_allowlist_db(tmp_path, "picker-unknown.db")
+    try:
+        from custom_components.nestquest.admin_allowlist import (
+            list_admin_ids,
+            set_admin_ids,
+        )
+
+        _run(set_admin_ids(database, ["u1"]))
+        entry = _make_entry()
+        flow = _make_flow(
+            entry,
+            users=[_user("u1", "Joshua")],
+            database=database,
+        )
+        result = _run(
+            flow.async_step_init(
+                {**VALID_INPUT, CONF_ADMIN_USER_IDS: ["impostor"]}
+            )
+        )
+        assert result["type"] == "form"
+        assert result["errors"] == {CONF_ADMIN_USER_IDS: "invalid_admin"}
+        assert await_gather(list_admin_ids(database)) == ["u1"]
+    finally:
+        _run(database.close())
+
+
+def test_options_flow_submit_without_admin_key_keeps_allowlist(tmp_path) -> None:
+    """Raw callers omitting the key (pre-picker payloads) do not
+    touch the allowlist; the CURRENT allowlist is carried forward on
+    the options copy so no removed admin can be resurrected later."""
+    database = _open_allowlist_db(tmp_path, "picker-legacy.db")
+    try:
+        from custom_components.nestquest.admin_allowlist import (
+            list_admin_ids,
+            set_admin_ids,
+        )
+
+        _run(set_admin_ids(database, ["u1"]))
+        entry = _make_entry()
+        flow = _make_flow(
+            entry,
+            users=[_user("u1", "Joshua")],
+            database=database,
+        )
+        result = _run(flow.async_step_init(dict(VALID_INPUT)))
+        assert result["type"] == "create_entry"
+        assert result["data"][CONF_ADMIN_USER_IDS] == ["u1"]
+        assert await_gather(list_admin_ids(database)) == ["u1"]
+    finally:
+        _run(database.close())
+
+
+def test_options_flow_duplicate_selection_refused(tmp_path) -> None:
+    """Duplicate ids surface as a field error, not an unhandled
+    ValueError from the business layer."""
+    database = _open_allowlist_db(tmp_path, "picker-dupe.db")
+    try:
+        from custom_components.nestquest.admin_allowlist import (
+            list_admin_ids,
+            set_admin_ids,
+        )
+
+        _run(set_admin_ids(database, ["u1"]))
+        entry = _make_entry()
+        flow = _make_flow(
+            entry,
+            users=[_user("u1", "Joshua"), _user("u2", "Sam")],
+            database=database,
+        )
+        result = _run(
+            flow.async_step_init(
+                {**VALID_INPUT, CONF_ADMIN_USER_IDS: ["u2", "u2"]}
+            )
+        )
+        assert result["type"] == "form"
+        assert result["errors"] == {CONF_ADMIN_USER_IDS: "invalid_admin"}
+        assert await_gather(list_admin_ids(database)) == ["u1"]
+    finally:
+        _run(database.close())
+
+
+def test_options_flow_omitted_picker_carries_allowlist_forward(
+    tmp_path,
+) -> None:
+    """An omitted picker field must not drop the allowlist copy from
+    the returned options: HA replaces entry.options wholesale, and a
+    later database loss must not resurrect removed admins from the
+    stale config-flow copy in entry.data."""
+    database = _open_allowlist_db(tmp_path, "picker-carry.db")
+    try:
+        from custom_components.nestquest.admin_allowlist import (
+            set_admin_ids,
+        )
+
+        _run(set_admin_ids(database, ["u2"]))
+        entry = _make_entry()
+        flow = _make_flow(
+            entry,
+            users=[_user("u1", "Joshua"), _user("u2", "Sam")],
+            database=database,
+        )
+        result = _run(flow.async_step_init(dict(VALID_INPUT)))
+        assert result["type"] == "create_entry"
+        # The current allowlist rides along on the legacy three-key path.
+        assert result["data"][CONF_ADMIN_USER_IDS] == ["u2"]
+        assert result["data"][CONF_HORIZON_DAYS] == VALID_INPUT[CONF_HORIZON_DAYS]
+    finally:
+        _run(database.close())

tests/test_presence.py

@@ -0,0 +1,814 @@
+"""Tests for presence.py: the Feature 05 custody model."""
+from __future__ import annotations
+
+import datetime
+
+import pytest
+
+from custom_components.nestquest.presence import (
+    MAX_CYCLE_LENGTH_WEEKS,
+    PresenceEngine,
+    PresenceOverride,
+    PresenceSchedule,
+    cycle_week_index,
+)
+
+
+ANCHOR = datetime.date(2026, 1, 5)  # a Monday
+
+TWO_WEEK_PATTERN = {0: {0, 2, 4}, 1: {1, 3}}
+
+
+# ---------------------------------------------------------------------------
+# PresenceSchedule construction
+# ---------------------------------------------------------------------------
+
+
+def test_schedule_holds_validated_fields() -> None:
+    schedule = PresenceSchedule(
+        3, 2, "2026-01-05", {0: {0, 2, 4}, 1: {1, 3}}
+    )
+    assert schedule.child_id == 3
+    assert schedule.cycle_length_weeks == 2
+    assert schedule.anchor_date == ANCHOR
+    assert schedule.pattern == {0: frozenset({0, 2, 4}), 1: frozenset({1, 3})}
+
+
+def test_schedule_accepts_date_objects() -> None:
+    schedule = PresenceSchedule(1, 1, ANCHOR, {0: {0}})
+    assert schedule.anchor_date is ANCHOR
+
+
+def test_schedule_rejects_cycle_length_below_one() -> None:
+    with pytest.raises(ValueError, match="between 1 and"):
+        PresenceSchedule(1, 0, ANCHOR, {})
+    with pytest.raises(ValueError, match="between 1 and"):
+        PresenceSchedule(1, -1, ANCHOR, {})
+
+
+def test_schedule_rejects_cycle_length_above_documented_cap() -> None:
+    """The 4 cap matches the schema's CHECK — both documents agree."""
+    with pytest.raises(ValueError, match="between 1 and"):
+        PresenceSchedule(1, MAX_CYCLE_LENGTH_WEEKS + 1, ANCHOR, {})
+    assert MAX_CYCLE_LENGTH_WEEKS == 4
+
+
+@pytest.mark.parametrize("bad", [True, "2", 1.0, None])
+def test_schedule_rejects_non_int_cycle_length(bad) -> None:
+    with pytest.raises(ValueError, match="cycle_length_weeks must be an integer"):
+        PresenceSchedule(1, bad, ANCHOR, {0: {0}})
+
+
+def test_schedule_rejects_pattern_missing_week_indices() -> None:
+    with pytest.raises(ValueError, match="missing \\[1\\]"):
+        PresenceSchedule(1, 2, ANCHOR, {0: {0, 2}})
+
+
+def test_schedule_rejects_pattern_with_extra_week_indices() -> None:
+    with pytest.raises(ValueError, match="week index must be in 0"):
+        PresenceSchedule(1, 2, ANCHOR, {0: {0}, 1: {1}, 2: {2}})
+
+
+def test_schedule_rejects_pattern_with_non_int_week_keys() -> None:
+    with pytest.raises(ValueError, match="week index must be an integer"):
+        PresenceSchedule(1, 1, ANCHOR, {"0": {0}})
+
+
+def test_schedule_rejects_pattern_with_bool_week_key() -> None:
+    """True would silently be week 1; bools are never valid indices."""
+    with pytest.raises(ValueError, match="week index must be an integer"):
+        PresenceSchedule(1, 2, ANCHOR, {0: {0}, True: {1}})
+
+
+@pytest.mark.parametrize("bad_weekday", [-1, 7, 100])
+def test_schedule_rejects_weekday_outside_zero_to_six(bad_weekday) -> None:
+    with pytest.raises(ValueError, match="weekday must be in 0..6"):
+        PresenceSchedule(1, 1, ANCHOR, {0: {bad_weekday}})
+
+
+@pytest.mark.parametrize("bad", [True, "1", 1.5, None])
+def test_schedule_rejects_non_int_weekdays(bad) -> None:
+    with pytest.raises(ValueError, match="weekday must be an int"):
+        PresenceSchedule(1, 1, ANCHOR, {0: [bad]})
+
+
+def test_schedule_rejects_string_and_none_week_sets() -> None:
+    """A string is iterable — "02" would silently mean {0, 2}."""
+    with pytest.raises(ValueError, match="iterable of weekday ints"):
+        PresenceSchedule(1, 1, ANCHOR, {0: "02"})
+    with pytest.raises(ValueError, match="iterable of weekday ints"):
+        PresenceSchedule(1, 1, ANCHOR, {0: None})
+
+
+def test_schedule_rejects_non_dict_pattern() -> None:
+    with pytest.raises(ValueError, match="must map week index"):
+        PresenceSchedule(1, 1, ANCHOR, "0,2")
+
+
+@pytest.mark.parametrize("bad", [True, 1.0, "2026-01-05", None])
+def test_schedule_rejects_non_int_child_id(bad) -> None:
+    with pytest.raises(ValueError, match="child_id must be an integer"):
+        PresenceSchedule(bad, 1, ANCHOR, {0: {0}})
+
+
+@pytest.mark.parametrize(
+    "bad", ["2026-1-5", "2026/01/05", "not-a-date", 5, None, True]
+)
+def test_schedule_rejects_non_strict_anchor_dates(bad) -> None:
+    with pytest.raises(ValueError, match="anchor_date"):
+        PresenceSchedule(1, 1, bad, {0: {0}})
+
+
+def test_schedule_empty_week_means_absent_week() -> None:
+    """An explicitly empty week is valid: absent every day of it —
+    distinct from having no schedule (the engine's default)."""
+    schedule = PresenceSchedule(1, 2, ANCHOR, {0: {0, 2}, 1: set()})
+    assert schedule.pattern[1] == frozenset()
+
+
+def test_schedule_empty_week_encodes_as_empty_segment() -> None:
+    schedule = PresenceSchedule(1, 2, ANCHOR, {0: {0, 2}, 1: set()})
+    assert schedule.encode() == "0,2|"
+
+
+def test_schedule_equal_patterns_are_equal_and_encode_identically() -> None:
+    one = PresenceSchedule(1, 2, ANCHOR, {0: {4, 2, 0}, 1: {3, 1}})
+    two = PresenceSchedule(2, 2, ANCHOR, {0: {0, 2, 4}, 1: {1, 3}})
+    assert one.encode() == two.encode() == "0,2,4|1,3"
+
+
+# ---------------------------------------------------------------------------
+# Serialization round-trip
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.parametrize(
+    "encoded",
+    [
+        "0,2,4|1,3",
+        "0|1,2,3,4,5,6",
+        "|",
+        "0,2|",
+        "|0,2",
+        "6",
+        "0,1,2,3,4,5,6|",
+    ],
+)
+def test_schedule_decode_encode_round_trips_losslessly(encoded) -> None:
+    schedule = PresenceSchedule.decode(1, ANCHOR, encoded)
+    assert schedule.encode() == encoded
+    again = PresenceSchedule.decode(1, ANCHOR, schedule.encode())
+    assert again == schedule
+
+
+def test_schedule_decode_sets_cycle_length_from_segments() -> None:
+    one_week = PresenceSchedule.decode(1, ANCHOR, "0,2,4")
+    assert one_week.cycle_length_weeks == 1
+    four_week = PresenceSchedule.decode(1, ANCHOR, "0|1|2|3,4")
+    assert four_week.cycle_length_weeks == 4
+
+
+def test_schedule_decode_rejects_malformed_segments() -> None:
+    for bad in ("0,12|1", "0,,2|1", "x|1", "0|-1|2", "8", "0,|1"):
+        with pytest.raises(ValueError, match="invalid weekday"):
+            PresenceSchedule.decode(1, ANCHOR, bad)
+
+
+def test_schedule_decode_rejects_non_string() -> None:
+    with pytest.raises(ValueError, match="must be a string"):
+        PresenceSchedule.decode(1, ANCHOR, None)
+
+
+def test_schedule_decode_rejects_too_many_segments(tmp_path) -> None:
+    with pytest.raises(ValueError, match="between 1 and"):
+        PresenceSchedule.decode(1, ANCHOR, "0|1|2|3|4")
+
+
+# ---------------------------------------------------------------------------
+# PresenceOverride
+# ---------------------------------------------------------------------------
+
+
+def test_override_single_date_and_range_cover() -> None:
+    single = PresenceOverride(1, "2026-07-20", "2026-07-20", False)
+    assert single.covers(datetime.date(2026, 7, 20))
+    assert not single.covers(datetime.date(2026, 7, 21))
+    span = PresenceOverride(1, "2026-07-20", "2026-07-24", True, note="trade")
+    assert span.covers(datetime.date(2026, 7, 22))
+    assert not span.covers(datetime.date(2026, 7, 19))
+    assert not span.covers(datetime.date(2026, 7, 25))
+    assert span.note == "trade"
+
+
+def test_override_end_before_start_rejected() -> None:
+    with pytest.raises(ValueError, match="end_date must be on or after"):
+        PresenceOverride(1, "2026-07-24", "2026-07-20", True)
+
+
+@pytest.mark.parametrize("bad", ["1", 0, 1.0, None])
+def test_override_rejects_non_bool_is_present(bad) -> None:
+    with pytest.raises(ValueError, match="is_present must be a real bool"):
+        PresenceOverride(1, "2026-07-20", "2026-07-20", bad)
+
+
+@pytest.mark.parametrize("bad", [5, ["note"], 1.5])
+def test_override_rejects_non_string_note(bad) -> None:
+    with pytest.raises(ValueError, match="note must be a string or None"):
+        PresenceOverride(1, "2026-07-20", "2026-07-20", True, note=bad)
+
+
+@pytest.mark.parametrize("bad", [True, 1.0, "1"])
+def test_override_rejects_non_int_child_id(bad) -> None:
+    with pytest.raises(ValueError, match="child_id must be an integer"):
+        PresenceOverride(bad, "2026-07-20", "2026-07-20", True)
+
+
+@pytest.mark.parametrize(
+    ("start", "end"), [("2026-7-20", "2026-07-20"), ("nope", "2026-07-20")]
+)
+def test_override_rejects_non_strict_dates(start, end) -> None:
+    with pytest.raises(ValueError, match="date"):
+        PresenceOverride(1, start, end, True)
+
+
+def test_schedule_rejects_datetime_anchor() -> None:
+    """datetime.datetime subclasses date: a bare isinstance check would
+    store a time component and every date comparison would TypeError."""
+    with pytest.raises(ValueError, match="plain calendar date"):
+        PresenceSchedule(1, 1, datetime.datetime(2026, 1, 5, 9, 30), {0: {0}})
+
+
+def test_override_rejects_datetime_bounds() -> None:
+    with pytest.raises(ValueError, match="plain calendar date"):
+        PresenceOverride(
+            1, datetime.datetime(2026, 7, 20), "2026-07-20", True
+        )
+
+
+def test_schedule_pattern_is_immutable_after_construction() -> None:
+    """The frozen schedule must not leak a mutable dict: injecting
+    unvalidated weekdays or dropping required weeks after construction
+    would bypass total validation."""
+    schedule = PresenceSchedule(1, 2, ANCHOR, {0: {0, 2}, 1: {1}})
+    with pytest.raises(TypeError):
+        schedule.pattern[0] = {9}
+    with pytest.raises(TypeError):
+        del schedule.pattern[1]
+    # mappingproxy exposes no mutators at all.
+    assert not any(
+        hasattr(schedule.pattern, name)
+        for name in ("clear", "pop", "popitem", "setdefault", "update")
+    )
+    # The validated contents are still readable and encode correctly.
+    assert schedule.pattern[0] == frozenset({0, 2})
+    assert schedule.encode() == "0,2|1"
+
+
+# ---------------------------------------------------------------------------
+# Cycle arithmetic: anchor-date only, never ISO week parity
+# ---------------------------------------------------------------------------
+
+
+def test_cycle_week_index_follows_the_anchor_formula() -> None:
+    schedule = PresenceSchedule(1, 2, ANCHOR, {0: {0}, 1: {1}})
+    # The anchor day starts week 0; each whole 7 days steps the cycle.
+    offsets = {0: 0, 1: 0, 6: 0, 7: 1, 8: 1, 13: 1, 14: 0, 15: 0, 22: 1}
+    for offset, expected in offsets.items():
+        assert (
+            cycle_week_index(
+                schedule, ANCHOR + datetime.timedelta(days=offset)
+            )
+            == expected
+        ), f"offset {offset}"
+
+
+def test_cycle_week_index_before_the_anchor_walks_backwards() -> None:
+    """Python floor division: day -1 is the LAST week of the cycle,
+    wrapping backwards — never inverting."""
+    schedule = PresenceSchedule(1, 2, ANCHOR, {0: {0}, 1: {1}})
+    assert cycle_week_index(schedule, ANCHOR - datetime.timedelta(days=1)) == 1
+    assert cycle_week_index(schedule, ANCHOR - datetime.timedelta(days=7)) == 1
+    assert cycle_week_index(schedule, ANCHOR - datetime.timedelta(days=8)) == 0
+
+
+def test_cycle_week_index_three_week_pattern() -> None:
+    schedule = PresenceSchedule(
+        1, 3, ANCHOR, {0: {0}, 1: {1}, 2: {2}}
+    )
+    offsets = [0, 7, 14, 21, 28]
+    assert [cycle_week_index(schedule, ANCHOR + datetime.timedelta(days=o)) for o in offsets] == [
+        0, 1, 2, 0, 1
+    ]
+
+
+def test_cycle_week_index_stable_across_three_year_boundaries() -> None:
+    """The regression this exists for: walking day by day through a
+    December 31st -> January 1st boundary, the cycle index steps by 0
+    or +1 (mod cycle length) and NEVER resets or inverts — including
+    2020, a 53-ISO-week year, where ISO week parity flips and would
+    invert a two-week custody schedule on January 1st."""
+    schedule = PresenceSchedule(
+        1, 2, datetime.date(2019, 1, 6), {0: {0, 2, 4}, 1: {1, 3}}
+    )
+    # Independently derived expectations (anchor 2019-01-06, index =
+    # floor(days-since-anchor / 7) % 2, hand-verified) — hardcoded so
+    # even an implementation that resets or inverts at January 1st
+    # cannot pass by coincidence:
+    expected = {
+        # 2019 -> 2020 boundary
+        datetime.date(2019, 12, 26): 0,
+        datetime.date(2019, 12, 27): 0,
+        datetime.date(2019, 12, 28): 0,
+        datetime.date(2019, 12, 29): 1,
+        datetime.date(2019, 12, 30): 1,
+        datetime.date(2019, 12, 31): 1,
+        datetime.date(2020, 1, 1): 1,
+        datetime.date(2020, 1, 2): 1,
+        datetime.date(2020, 1, 3): 1,
+        datetime.date(2020, 1, 4): 1,
+        datetime.date(2020, 1, 5): 0,
+        datetime.date(2020, 1, 6): 0,
+        datetime.date(2020, 1, 7): 0,
+        # 2020 (53 ISO weeks) -> 2021 boundary
+        datetime.date(2020, 12, 27): 1,
+        datetime.date(2020, 12, 28): 1,
+        datetime.date(2020, 12, 29): 1,
+        datetime.date(2020, 12, 30): 1,
+        datetime.date(2020, 12, 31): 1,
+        datetime.date(2021, 1, 1): 1,
+        datetime.date(2021, 1, 2): 1,
+        datetime.date(2021, 1, 3): 0,
+        datetime.date(2021, 1, 4): 0,
+        datetime.date(2021, 1, 5): 0,
+        datetime.date(2021, 1, 6): 0,
+        datetime.date(2021, 1, 7): 0,
+        # 2021 -> 2022 boundary
+        datetime.date(2021, 12, 27): 1,
+        datetime.date(2021, 12, 28): 1,
+        datetime.date(2021, 12, 29): 1,
+        datetime.date(2021, 12, 30): 1,
+        datetime.date(2021, 12, 31): 1,
+        datetime.date(2022, 1, 1): 1,
+        datetime.date(2022, 1, 2): 0,
+        datetime.date(2022, 1, 3): 0,
+        datetime.date(2022, 1, 4): 0,
+        datetime.date(2022, 1, 5): 0,
+        datetime.date(2022, 1, 6): 0,
+        datetime.date(2022, 1, 7): 0,
+    }
+    for day, wanted in expected.items():
+        got = cycle_week_index(schedule, day)
+        assert got == wanted, f"{day}: expected week {wanted}, got {got}"
+    # And 2020 really is the 53-ISO-week year this guards against.
+    assert datetime.date(2020, 12, 31).isocalendar()[1] == 53
+
+
+def test_module_uses_no_iso_week_functions() -> None:
+    """D-004 guardrail: cycle math never reads ISO week numbers."""
+    from pathlib import Path
+
+    source = Path(
+        __import__("custom_components.nestquest.presence", fromlist=["__file__"]).__file__
+    ).read_text()
+    assert "isocalendar" not in source
+    assert "isoweek" not in source
+
+
+# ---------------------------------------------------------------------------
+# PresenceEngine: is_present with the always-present default
+# ---------------------------------------------------------------------------
+
+
+def _three_child_engine() -> PresenceEngine:
+    """Two children on opposite weeks of one two-week rotation, one
+    with no schedule at all (the always-present sibling)."""
+    anchor = datetime.date(2026, 1, 5)  # Monday, week 0
+    declan = PresenceSchedule(
+        1, 2, anchor, {0: {0, 1, 2, 3, 4, 5, 6}, 1: set()}
+    )
+    jordyn = PresenceSchedule(
+        2, 2, anchor, {0: set(), 1: {0, 1, 2, 3, 4, 5, 6}}
+    )
+    return PresenceEngine({1: declan, 2: jordyn})
+
+
+def test_engine_child_without_schedule_is_always_present() -> None:
+    """Every day of the four-week span, all three children get the
+    expected verdict: Chloe (no schedule) always present; the two
+    rotation children complementary per the anchor pattern."""
+    engine = _three_child_engine()
+    anchor = datetime.date(2026, 1, 5)
+    for offset in range(28):
+        day = anchor + datetime.timedelta(days=offset)
+        week = ((day - anchor).days // 7) % 2
+        assert engine.is_present(3, day) is True, f"offset {offset}: Chloe"
+        assert engine.is_present(1, day) is (week == 0), (
+            f"offset {offset}: Declan should follow week {week}"
+        )
+        assert engine.is_present(2, day) is (week == 1), (
+            f"offset {offset}: Jordyn should follow week {week}"
+        )
+
+
+def test_engine_alternating_children_are_complementary_for_four_weeks() -> None:
+    """Every day of a four-week span: the two rotation children swap
+    presence exactly per the anchor pattern — when one is home the
+    other is away."""
+    engine = _three_child_engine()
+    anchor = datetime.date(2026, 1, 5)
+    for offset in range(28):
+        day = anchor + datetime.timedelta(days=offset)
+        d = engine.is_present(1, day)
+        j = engine.is_present(2, day)
+        assert d == (not j), f"offset {offset}: {d}/{j} not complementary"
+        expected_week = ((day - anchor).days // 7) % 2
+        expected_present = day.weekday() in {0, 1, 2, 3, 4, 5, 6}
+        assert engine.is_present(1, day) == (expected_week == 0), (
+            f"offset {offset}: Declan week {expected_week}"
+        )
+    # Spot-check the swap days.
+    assert engine.is_present(1, anchor) is True
+    assert engine.is_present(2, anchor) is False
+    assert engine.is_present(1, anchor + datetime.timedelta(days=7)) is False
+    assert engine.is_present(2, anchor + datetime.timedelta(days=7)) is True
+
+
+def test_engine_weekend_absence_respects_the_pattern() -> None:
+    """A weekday-set pattern excludes days outside the set even in the
+    child's present week."""
+    engine = PresenceEngine(
+        {
+            1: PresenceSchedule(
+                1, 2, datetime.date(2026, 1, 5), {0: {1, 3}, 1: {2, 4}}
+            )
+        }
+    )
+    # 2026-01-06 (Tue) is week 0, weekday 1 -> present.
+    assert engine.is_present(1, datetime.date(2026, 1, 6)) is True
+    # 2026-01-07 (Wed) is week 0, weekday 2 -> absent.
+    assert engine.is_present(1, datetime.date(2026, 1, 7)) is False
+    # 2026-01-14 (Wed) is week 1, weekday 2 -> present.
+    assert engine.is_present(1, datetime.date(2026, 1, 14)) is True
+
+
+def test_engine_rejects_bad_construction_and_inputs() -> None:
+    schedule = PresenceSchedule(1, 1, ANCHOR, {0: {0}})
+    with pytest.raises(ValueError, match="must map child_id"):
+        PresenceEngine([schedule])
+    with pytest.raises(ValueError, match="must be a PresenceSchedule"):
+        PresenceEngine({1: "not-a-schedule"})
+    with pytest.raises(ValueError, match="holds the schedule"):
+        PresenceEngine({2: schedule})
+    with pytest.raises(ValueError, match="child_id must be an integer"):
+        PresenceEngine({True: schedule})
+    with pytest.raises(ValueError, match="child_id must be an integer"):
+        PresenceEngine({1.0: PresenceSchedule(1, 1, ANCHOR, {0: {0}})})
+    engine = PresenceEngine({1: schedule})
+    with pytest.raises(ValueError, match="child_id must be an integer"):
+        engine.is_present(True, ANCHOR)
+    with pytest.raises(ValueError, match="plain calendar date"):
+        engine.is_present(1, datetime.datetime(2026, 1, 5))
+
+
+def test_engine_is_immutable() -> None:
+    engine = _three_child_engine()
+    with pytest.raises(AttributeError, match="immutable snapshot"):
+        engine._schedules = {}
+    with pytest.raises(AttributeError, match="immutable snapshot"):
+        engine.something_new = 1
+
+
+# ---------------------------------------------------------------------------
+# Overrides take precedence over the pattern
+# ---------------------------------------------------------------------------
+
+
+def _engine_with_overrides(*overrides_for_declan) -> PresenceEngine:
+    anchor = datetime.date(2026, 1, 5)  # Monday
+    return PresenceEngine(
+        {
+            1: PresenceSchedule(
+                1, 2, anchor, {0: {0, 1, 2, 3, 4, 5, 6}, 1: set()}
+            )
+        },
+        overrides={1: list(overrides_for_declan)} if overrides_for_declan else {},
+    )
+
+
+def test_absent_override_on_normally_present_day_wins() -> None:
+    # 2026-01-06 is Tuesday of Declan's week 0: normally present.
+    engine = _engine_with_overrides(
+        PresenceOverride(1, "2026-01-06", "2026-01-06", False, note="away")
+    )
+    assert engine.is_present(1, datetime.date(2026, 1, 6)) is False
+    # The pattern resumes outside the override.
+    assert engine.is_present(1, datetime.date(2026, 1, 7)) is True
+
+
+def test_present_override_on_normally_absent_day_wins() -> None:
+    # 2026-01-13 is in Declan's week 1 (away all week); a present
+    # override on the Tuesday of week 1 brings him home for that day.
+    engine = _engine_with_overrides(
+        PresenceOverride(1, "2026-01-13", "2026-01-13", True, note="trade")
+    )
+    assert engine.is_present(1, datetime.date(2026, 1, 13)) is True
+    assert engine.is_present(1, datetime.date(2026, 1, 14)) is False
+
+
+def test_override_applies_without_a_schedule() -> None:
+    """An override on a schedule-free child still applies: holidays and
+    swaps must work for the always-present sibling too."""
+    engine = PresenceEngine(
+        {},
+        overrides={
+            3: [
+                PresenceOverride(
+                    3, "2026-07-20", "2026-07-24", False, note="holiday"
+                )
+            ]
+        },
+    )
+    assert engine.is_present(3, datetime.date(2026, 7, 22)) is False
+    assert engine.is_present(3, datetime.date(2026, 7, 19)) is True
+    assert engine.is_present(3, datetime.date(2026, 7, 25)) is True
+
+
+def test_override_range_beats_pattern_for_its_span() -> None:
+    engine = _engine_with_overrides(
+        PresenceOverride(1, "2026-01-13", "2026-01-17", True, note="traded week")
+    )
+    for offset in range(12, 17):
+        day = datetime.date(2026, 1, 1) + datetime.timedelta(days=offset)
+        assert engine.is_present(1, day) is True, f"{day}"
+    # Days outside the span stay on the pattern (week 1: absent).
+    assert engine.is_present(1, datetime.date(2026, 1, 12)) is False
+    assert engine.is_present(1, datetime.date(2026, 1, 18)) is False
+
+
+def test_engine_override_snapshot_validation() -> None:
+    schedule = PresenceSchedule(1, 1, ANCHOR, {0: {0}})
+    entry = PresenceOverride(1, "2026-07-20", "2026-07-20", True)
+    with pytest.raises(ValueError, match="must map child_id"):
+        PresenceEngine({1: schedule}, overrides=[entry])
+    with pytest.raises(ValueError, match="must be a list"):
+        PresenceEngine({1: schedule}, overrides={1: entry})
+    with pytest.raises(ValueError, match="must be"):
+        PresenceEngine({1: schedule}, overrides={1: ["nope"]})
+    with pytest.raises(ValueError, match="holds an override"):
+        PresenceEngine({1: schedule}, overrides={2: [entry]})
+    with pytest.raises(ValueError, match="child_id must be an integer"):
+        PresenceEngine({1: schedule}, overrides={True: [entry]})
+
+
+def test_engine_overlapping_snapshot_uses_latest_start() -> None:
+    """The DAO layer refuses overlapping overrides per child; if a
+    snapshot carries them anyway (hand-built), the latest start date
+    wins deterministically."""
+    engine = _engine_with_overrides(
+        PresenceOverride(1, "2026-01-06", "2026-01-10", False),
+        PresenceOverride(1, "2026-01-08", "2026-01-12", True),
+    )
+    # Jan 6-7: only the earlier override covers -> absent.
+    assert engine.is_present(1, datetime.date(2026, 1, 6)) is False
+    # Jan 8-10: both cover; the LATER start (present) wins.
+    assert engine.is_present(1, datetime.date(2026, 1, 9)) is True
+    # Jan 11-12: only the later override covers -> present.
+    assert engine.is_present(1, datetime.date(2026, 1, 11)) is True
+
+
+def test_engine_override_lists_are_frozen() -> None:
+    """The overrides snapshot must be truly read-only: the engine is
+    built directly on the CALLER's list, so mutating that list after
+    construction would change answers under a shallow copy — under the
+    frozen snapshot it must not."""
+    entry = PresenceOverride(1, "2026-01-06", "2026-01-06", False)
+    entries = [entry]
+    schedule = PresenceSchedule(
+        1, 2, ANCHOR, {0: {0, 1, 2, 3, 4, 5, 6}, 1: set()}
+    )
+    engine = PresenceEngine(
+        {1: schedule}, overrides={1: entries}  # caller-owned list
+    )
+    assert engine.is_present(1, datetime.date(2026, 1, 6)) is False
+    entries.append(PresenceOverride(1, "2026-01-07", "2026-01-07", False))
+    # The late append must NOT change the engine's answers...
+    assert engine.is_present(1, datetime.date(2026, 1, 7)) is True
+    # Tuples have no append at all (AttributeError), and the mapping
+    # itself refuses reassignment.
+    with pytest.raises(AttributeError):
+        engine._overrides[1].append(entry)
+    with pytest.raises(AttributeError, match="immutable snapshot"):
+        engine._overrides = {}
+
+
+# ---------------------------------------------------------------------------
+# next_present_dates: the parent's pattern preview
+# ---------------------------------------------------------------------------
+
+
+def _preview_engine() -> PresenceEngine:
+    """Declan: home all of week 0, away all of week 1 (anchor
+    2026-01-05, a Monday); an away override Tue Jan 13 (his away week)
+    would matter only for the override test."""
+    return PresenceEngine(
+        {
+            1: PresenceSchedule(
+                1, 2, datetime.date(2026, 1, 5),
+                {0: {0, 1, 2, 3, 4, 5, 6}, 1: set()},
+            )
+        }
+    )
+
+
+def test_preview_returns_the_next_present_days_of_a_known_pattern() -> None:
+    engine = _preview_engine()
+    # Starting Monday Jan 5 (present week 0): five straight days.
+    preview = engine.next_present_dates(1, "2026-01-05", 5)
+    assert preview == [
+        datetime.date(2026, 1, 5),
+        datetime.date(2026, 1, 6),
+        datetime.date(2026, 1, 7),
+        datetime.date(2026, 1, 8),
+        datetime.date(2026, 1, 9),
+    ]
+    # Starting mid-week: the rest of week 0 first, then the absent
+    # week 1 is skipped and the next present week picks up.
+    preview = engine.next_present_dates(1, "2026-01-07", 3)
+    assert preview == [
+        datetime.date(2026, 1, 7),
+        datetime.date(2026, 1, 8),
+        datetime.date(2026, 1, 9),
+    ]
+    preview = engine.next_present_dates(1, "2026-01-07", 6)
+    # Week 0 runs Mon Jan 5 .. Sun Jan 11 (all present); the away week
+    # (Jan 12-18) is skipped; week 2 resumes Jan 19.
+    assert preview == [
+        datetime.date(2026, 1, 7),
+        datetime.date(2026, 1, 8),
+        datetime.date(2026, 1, 9),
+        datetime.date(2026, 1, 10),
+        datetime.date(2026, 1, 11),
+        datetime.date(2026, 1, 19),
+    ]
+
+
+def test_preview_start_date_is_inclusive() -> None:
+    engine = _preview_engine()
+    # Jan 12 (Monday of the away week) is absent: the first present day
+    # is Jan 19 — the start date itself when present.
+    preview = engine.next_present_dates(1, "2026-01-19", 1)
+    assert preview == [datetime.date(2026, 1, 19)]
+
+
+def test_preview_honours_overrides() -> None:
+    schedule = PresenceSchedule(
+        1, 2, datetime.date(2026, 1, 5),
+        {0: {0, 1, 2, 3, 4, 5, 6}, 1: set()},
+    )
+    engine = PresenceEngine(
+        {1: schedule},
+        overrides={
+            1: [
+                PresenceOverride(
+                    1, "2026-01-05", "2026-01-06", False, note="holiday"
+                )
+            ]
+        },
+    )
+    # Jan 5-6 blocked by the override: the preview starts Jan 7.
+    preview = engine.next_present_dates(1, "2026-01-04", 3)
+    assert preview == [
+        datetime.date(2026, 1, 7),
+        datetime.date(2026, 1, 8),
+        datetime.date(2026, 1, 9),
+    ]
+
+
+def test_preview_schedule_free_child_returns_consecutive_days() -> None:
+    engine = PresenceEngine({})
+    preview = engine.next_present_dates(3, "2026-03-01", 3)
+    assert preview == [
+        datetime.date(2026, 3, 1),
+        datetime.date(2026, 3, 2),
+        datetime.date(2026, 3, 3),
+    ]
+
+
+def test_preview_rejects_bad_inputs() -> None:
+    engine = _preview_engine()
+    with pytest.raises(ValueError, match="count must be an integer"):
+        engine.next_present_dates(1, "2026-01-05", "3")
+    with pytest.raises(ValueError, match="count must be at least 1"):
+        engine.next_present_dates(1, "2026-01-05", 0)
+    with pytest.raises(ValueError, match="child_id must be an integer"):
+        engine.next_present_dates(True, "2026-01-05", 1)
+    with pytest.raises(ValueError, match="plain calendar date"):
+        engine.next_present_dates(1, datetime.datetime(2026, 1, 5), 1)
+
+
+def test_preview_always_absent_child_raises_not_loops() -> None:
+    """A child absent every scanned day must surface as an error, not
+    hang the admin preview."""
+    engine = PresenceEngine(
+        {
+            1: PresenceSchedule(
+                1, 1, datetime.date(2026, 1, 5), {0: set()}
+            )
+        }
+    )
+    with pytest.raises(ValueError, match="not present on any"):
+        engine.next_present_dates(1, "2026-01-05", 2)
+
+
+# ---------------------------------------------------------------------------
+# The week-parity regression guard (Feature 05, D-004)
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.parametrize(
+    ("year", "length", "reason"),
+    [
+        (2020, 366, "leap year, 53 ISO weeks"),
+        (2015, 365, "365 days, 53 ISO weeks"),
+    ],
+)
+def test_custody_rotation_walks_full_years_without_inversion(
+    year, length, reason
+) -> None:
+    """REGRESSION GUARD for the week-parity bug (D-004).
+
+    Walks a two-week alternating rotation day by day across a FULL
+    {length}-day year ({year} — {reason}) plus the following January,
+    asserting the present/absent sequence never breaks or inverts at
+    any point, including January 1st.  ISO week parity silently flips
+    at the ISO-week rollover (the Monday on or after January 4th —
+    January 4th itself in both of these years, which end ISO week 53)
+    and would invert every custody schedule there; anchor-date
+    arithmetic must not.
+    """.format(length=length, year=year, reason=reason)
+    if year == 2020:
+        assert datetime.date(2020, 12, 31).isocalendar()[1] == 53
+        assert (datetime.date(2021, 1, 1) - datetime.date(2020, 1, 1)).days == 366
+    if year == 2015:
+        assert datetime.date(2015, 12, 31).isocalendar()[1] == 53
+        assert (datetime.date(2016, 1, 1) - datetime.date(2015, 1, 1)).days == 365
+
+    # The first Monday of January (2020: Jan 6; 2015: Jan 5) — an
+    # on-week anchor, whatever the year.
+    anchor = datetime.date(year, 1, 1) + datetime.timedelta(
+        days=(7 - datetime.date(year, 1, 1).weekday()) % 7
+    )
+    assert anchor.weekday() == 0
+    rotation = PresenceSchedule(
+        1, 2, anchor, {0: {0, 1, 2, 3, 4, 5, 6}, 1: set()}
+    )
+    engine = PresenceEngine({1: rotation})
+
+    # Walk EVERY day of the year.  The expectation is derived from the
+    # anchor's 7-day BLOCKS, not from the engine: each block of seven
+    # days starting at the anchor is uniformly present (even block
+    # index) or uniformly absent (odd block index), and consecutive
+    # blocks alternate.  A parity-based implementation resets on
+    # January 1st and breaks either the uniformity of a block or the
+    # alternation between them — most visibly in the block spanning
+    # December 31st -> January 1st of a 53-ISO-week year.
+    # Walk the FULL year AND the first two weeks of the following
+    # January: the block spanning December 31st -> January 1st must
+    # stay uniform ACROSS the boundary, so an implementation that
+    # resets when the target year differs from the anchor's fails
+    # here (the post-boundary days of its final block disagree).
+    first_day = datetime.date(year, 1, 1)
+    last_day = datetime.date(year + 1, 1, 14)
+    days_seen = 0
+    day = first_day
+    while day <= last_day:
+        days_since_anchor = (day - anchor).days
+        block = days_since_anchor // 7  # which 7-day block of the cycle
+        block_start = anchor + datetime.timedelta(days=block * 7)
+        # Uniformity within the block: every day of this 7-day block
+        # must answer exactly like the block's first day.
+        expected = ((block % 2) == 0)
+        assert engine.is_present(1, day) is expected, (
+            f"{day} (block {block}, day offset "
+            f"{(day - block_start).days}): present="
+            f"{engine.is_present(1, day)}, expected {expected}"
+        )
+        # The block's OTHER days must agree — including the days on
+        # the far side of January 1st.
+        for offset in range(7):
+            block_day = block_start + datetime.timedelta(days=offset)
+            if first_day <= block_day <= last_day:
+                assert engine.is_present(1, block_day) is expected, (
+                    f"{block_day} disagrees with its block {block}"
+                )
+        days_seen += 1
+        day += datetime.timedelta(days=1)
+    # The walked year itself contributed exactly its full length.
+    year_days = sum(
+        1
+        for offset in range((last_day - first_day).days + 1)
+        if (first_day + datetime.timedelta(days=offset)).year == year
+    )
+    assert year_days == length, (
+        f"walked {year_days} days of {year}, expected {length}"
+    )

tests/test_schema.py

@@ -16,6 +16,8 @@ from custom_components.nestquest.schema import (
     SCHEMA_V1_SCHEDULE_RULES_DDL,
     SCHEMA_V1_STATEMENTS,
     SCHEMA_V1_QUEST_DEFINITIONS_DDL,
+    SCHEMA_V1_QUEST_DEFINITION_ASSIGNEES_DDL,
+    SCHEMA_V1_QUEST_DEFINITION_WINDOWS_DDL,
     SCHEMA_V1_QUEST_INSTANCES_DDL,
     async_apply_ddl,
 )
@@ -73,15 +75,17 @@ def _insert_rule(database, **overrides):
     return result.lastrowid
 
 
-def _insert_definition(database, child_id=1, rule_id=1, **overrides):
-    """Insert one valid task_definition, returning the definition id.
+def _insert_definition(database, rule_id=1, assignees=(1,), **overrides):
+    """Insert one valid quest_definition, returning the definition id.
 
+    ``assignees`` rows are written to ``quest_definition_assignees``
+    after the definition insert (the definition itself carries no
+    child).  Pass ``assignees=None`` for an unassigned definition.
     Pass ``_OMIT`` as a value to leave that column out of the INSERT so
     its DDL DEFAULT applies.
     """
     values: dict[str, object] = {
         "title": "Brush teeth",
-        "child_id": child_id,
         "schedule_rule_id": rule_id,
         "created_at": "2026-09-13T00:00:00+00:00",
     }
@@ -96,6 +100,14 @@ def _insert_definition(database, child_id=1, rule_id=1, **overrides):
         )
     )
     assert result.lastrowid is not None
+    for child_id in assignees or ():
+        _run(
+            database.execute(
+                "INSERT INTO quest_definition_assignees "
+                "(definition_id, child_id) VALUES (?, ?)",
+                (result.lastrowid, child_id),
+            )
+        )
     return result.lastrowid
 
 
@@ -156,12 +168,14 @@ def _insert_override(database, child_id, **overrides):
 # ---------------------------------------------------------------------------
 
 
-def test_schema_v1_statements_compose_the_six_tables() -> None:
+def test_schema_v1_statements_compose_the_eight_tables() -> None:
     assert SCHEMA_V1_STATEMENTS == [
         *SCHEMA_V1_CHILDREN_DDL,
         *SCHEMA_V1_ADMIN_USERS_DDL,
         *SCHEMA_V1_SCHEDULE_RULES_DDL,
         *SCHEMA_V1_QUEST_DEFINITIONS_DDL,
+        *SCHEMA_V1_QUEST_DEFINITION_ASSIGNEES_DDL,
+        *SCHEMA_V1_QUEST_DEFINITION_WINDOWS_DDL,
         *SCHEMA_V1_PRESENCE_SCHEDULES_DDL,
         *SCHEMA_V1_PRESENCE_OVERRIDES_DDL,
         *SCHEMA_V1_QUEST_INSTANCES_DDL,
@@ -302,7 +316,6 @@ def test_quest_definitions_columns_types_and_constraints(tmp_path) -> None:
             ("title", "TEXT", 1, None, 0),
             ("description", "TEXT", 0, None, 0),
             ("icon", "TEXT", 0, None, 0),
-            ("child_id", "INTEGER", 1, None, 0),
             ("schedule_rule_id", "INTEGER", 1, None, 0),
             ("due_time", "TEXT", 0, None, 0),
             ("is_active", "INTEGER", 1, "1", 0),
@@ -319,13 +332,66 @@ def test_quest_definitions_foreign_keys_declared(tmp_path) -> None:
         fks = _run(database.fetch_all("PRAGMA foreign_key_list(quest_definitions)"))
         declared = {(row[2], row[3], row[4]) for row in fks}
         assert declared == {
-            ("children", "child_id", "id"),
             ("schedule_rules", "schedule_rule_id", "id"),
         }
     finally:
         _run(database.close())
 
 
+def test_quest_definition_assignees_table_exists_after_applying_ddl(
+    tmp_path,
+) -> None:
+    database = _open_db(tmp_path / "assignees.db")
+    try:
+        _apply(database)
+        row = _run(
+            database.fetch_one(
+                "SELECT name FROM sqlite_master WHERE type = 'table' "
+                "AND name = 'quest_definition_assignees'"
+            )
+        )
+        assert row is not None and row[0] == "quest_definition_assignees"
+    finally:
+        _run(database.close())
+
+
+def test_quest_definition_assignees_columns_types_and_constraints(
+    tmp_path,
+) -> None:
+    database = _open_db(tmp_path / "assignees-columns.db")
+    try:
+        _apply(database)
+        columns = _run(
+            database.fetch_all("PRAGMA table_info(quest_definition_assignees)")
+        )
+        # cid, name, type, notnull, dflt_value, pk — both columns are
+        # the two-part primary key, so pk is 1 and 2.
+        assert [(row[1], row[2], row[3], row[4], row[5]) for row in columns] == [
+            ("definition_id", "INTEGER", 1, None, 1),
+            ("child_id", "INTEGER", 1, None, 2),
+        ]
+    finally:
+        _run(database.close())
+
+
+def test_quest_definition_assignees_foreign_keys_declared(tmp_path) -> None:
+    database = _open_db(tmp_path / "assignees-fks.db")
+    try:
+        _apply(database)
+        fks = _run(
+            database.fetch_all(
+                "PRAGMA foreign_key_list(quest_definition_assignees)"
+            )
+        )
+        declared = {(row[2], row[3], row[4]) for row in fks}
+        assert declared == {
+            ("quest_definitions", "definition_id", "id"),
+            ("children", "child_id", "id"),
+        }
+    finally:
+        _run(database.close())
+
+
 # ---------------------------------------------------------------------------
 # Constraint enforcement
 # ---------------------------------------------------------------------------
@@ -826,28 +892,274 @@ def test_quest_definitions_insert_requires_existing_child_and_rule(
             )
         )
         rule_id = _insert_rule(database)
-        definition_id = _insert_definition(
-            database, child_id=1, rule_id=rule_id
-        )
+        definition_id = _insert_definition(database, rule_id=rule_id)
         row = _run(
             database.fetch_one(
-                "SELECT title, child_id, schedule_rule_id FROM quest_definitions "
+                "SELECT title, schedule_rule_id FROM quest_definitions "
                 "WHERE id = ?",
                 (definition_id,),
             )
         )
-        assert row == ("Brush teeth", 1, rule_id)
+        assert row == ("Brush teeth", rule_id)
+        assignee = _run(
+            database.fetch_one(
+                "SELECT child_id FROM quest_definition_assignees "
+                "WHERE definition_id = ?",
+                (definition_id,),
+            )
+        )
+        assert assignee == (1,)
     finally:
         _run(database.close())
 
 
-def test_quest_definitions_unknown_child_id_fails(tmp_path) -> None:
-    database = _open_db(tmp_path / "definitions-bad-child.db")
+def test_quest_definition_assignees_unknown_child_fails(tmp_path) -> None:
+    database = _open_db(tmp_path / "assignees-bad-child.db")
     try:
         _apply(database)
         _insert_rule(database)
+        definition_id = _insert_definition(database, assignees=None)
         with pytest.raises(sqlite3.IntegrityError, match="FOREIGN KEY"):
-            _insert_definition(database, child_id=999)
+            _run(
+                database.execute(
+                    "INSERT INTO quest_definition_assignees "
+                    "(definition_id, child_id) VALUES (?, 999)",
+                    (definition_id,),
+                )
+            )
+    finally:
+        _run(database.close())
+
+
+def test_quest_definition_assignees_unknown_definition_fails(tmp_path) -> None:
+    database = _open_db(tmp_path / "assignees-bad-definition.db")
+    try:
+        _apply(database)
+        _run(
+            database.execute(
+                "INSERT INTO children (display_name, created_at) VALUES (?, ?)",
+                ("Ada", "2026-09-13T00:00:00+00:00"),
+            )
+        )
+        with pytest.raises(sqlite3.IntegrityError, match="FOREIGN KEY"):
+            _run(
+                database.execute(
+                    "INSERT INTO quest_definition_assignees "
+                    "(definition_id, child_id) VALUES (999, 1)"
+                )
+            )
+    finally:
+        _run(database.close())
+
+
+def test_quest_definition_assignees_duplicate_pair_fails(tmp_path) -> None:
+    database = _open_db(tmp_path / "assignees-duplicate.db")
+    try:
+        _apply(database)
+        _run(
+            database.execute(
+                "INSERT INTO children (display_name, created_at) VALUES (?, ?)",
+                ("Ada", "2026-09-13T00:00:00+00:00"),
+            )
+        )
+        _insert_rule(database)
+        definition_id = _insert_definition(database)
+        with pytest.raises(sqlite3.IntegrityError):
+            _run(
+                database.execute(
+                    "INSERT INTO quest_definition_assignees "
+                    "(definition_id, child_id) VALUES (?, 1)",
+                    (definition_id,),
+                )
+            )
+    finally:
+        _run(database.close())
+
+
+def test_quest_definition_windows_table_exists_after_applying_ddl(
+    tmp_path,
+) -> None:
+    database = _open_db(tmp_path / "windows.db")
+    try:
+        _apply(database)
+        row = _run(
+            database.fetch_one(
+                "SELECT name FROM sqlite_master WHERE type = 'table' "
+                "AND name = 'quest_definition_windows'"
+            )
+        )
+        assert row is not None and row[0] == "quest_definition_windows"
+    finally:
+        _run(database.close())
+
+
+def test_quest_definition_windows_columns_types_and_constraints(
+    tmp_path,
+) -> None:
+    database = _open_db(tmp_path / "windows-columns.db")
+    try:
+        _apply(database)
+        columns = _run(
+            database.fetch_all("PRAGMA table_info(quest_definition_windows)")
+        )
+        # cid, name, type, notnull, dflt_value, pk — the composite
+        # primary key spans definition_id and window.
+        assert [(row[1], row[2], row[3], row[4], row[5]) for row in columns] == [
+            ("definition_id", "INTEGER", 1, None, 1),
+            ("window", "TEXT", 1, None, 2),
+            ("due_time", "TEXT", 0, None, 0),
+        ]
+    finally:
+        _run(database.close())
+
+
+def test_quest_definition_windows_foreign_keys_declared(tmp_path) -> None:
+    database = _open_db(tmp_path / "windows-fks.db")
+    try:
+        _apply(database)
+        fks = _run(
+            database.fetch_all(
+                "PRAGMA foreign_key_list(quest_definition_windows)"
+            )
+        )
+        declared = {(row[2], row[3], row[4]) for row in fks}
+        assert declared == {
+            ("quest_definitions", "definition_id", "id"),
+        }
+    finally:
+        _run(database.close())
+
+
+def test_quest_definition_windows_valid_rows_round_trip(tmp_path) -> None:
+    database = _open_db(tmp_path / "windows-roundtrip.db")
+    try:
+        _apply(database)
+        _run(
+            database.execute(
+                "INSERT INTO children (display_name, created_at) VALUES (?, ?)",
+                ("Ada", "2026-09-13T00:00:00+00:00"),
+            )
+        )
+        _insert_rule(database)
+        definition_id = _insert_definition(database, assignees=None)
+        for window, due in (
+            ("morning", "09:00"),
+            ("afternoon", None),
+            ("evening", "19:30"),
+        ):
+            _run(
+                database.execute(
+                    "INSERT INTO quest_definition_windows "
+                    "(definition_id, window, due_time) VALUES (?, ?, ?)",
+                    (definition_id, window, due),
+                )
+            )
+        rows = _run(
+            database.fetch_all(
+                "SELECT window, due_time FROM quest_definition_windows "
+                "WHERE definition_id = ? ORDER BY window",
+                (definition_id,),
+            )
+        )
+        assert rows == [
+            ("afternoon", None),
+            ("evening", "19:30"),
+            ("morning", "09:00"),
+        ]
+    finally:
+        _run(database.close())
+
+
+@pytest.mark.parametrize(
+    "window", ["Midnight", "MORNING", "noon", "", "evenings"]
+)
+def test_quest_definition_windows_window_check_enforced(
+    tmp_path, window
+) -> None:
+    database = _open_db(tmp_path / "windows-check.db")
+    try:
+        _apply(database)
+        _insert_rule(database)
+        definition_id = _insert_definition(database, assignees=None)
+        with pytest.raises(sqlite3.IntegrityError, match="CHECK"):
+            _run(
+                database.execute(
+                    "INSERT INTO quest_definition_windows "
+                    "(definition_id, window, due_time) VALUES (?, ?, NULL)",
+                    (definition_id, window),
+                )
+            )
+    finally:
+        _run(database.close())
+
+
+def test_quest_definition_windows_duplicate_window_fails(tmp_path) -> None:
+    database = _open_db(tmp_path / "windows-duplicate.db")
+    try:
+        _apply(database)
+        _insert_rule(database)
+        definition_id = _insert_definition(database, assignees=None)
+        _run(
+            database.execute(
+                "INSERT INTO quest_definition_windows "
+                "(definition_id, window, due_time) "
+                "VALUES (?, 'morning', NULL)",
+                (definition_id,),
+            )
+        )
+        with pytest.raises(sqlite3.IntegrityError):
+            _run(
+                database.execute(
+                    "INSERT INTO quest_definition_windows "
+                    "(definition_id, window, due_time) "
+                    "VALUES (?, 'morning', '09:00')",
+                    (definition_id,),
+                )
+            )
+    finally:
+        _run(database.close())
+
+
+def test_quest_definition_windows_unknown_definition_fails(tmp_path) -> None:
+    database = _open_db(tmp_path / "windows-bad-definition.db")
+    try:
+        _apply(database)
+        with pytest.raises(sqlite3.IntegrityError, match="FOREIGN KEY"):
+            _run(
+                database.execute(
+                    "INSERT INTO quest_definition_windows "
+                    "(definition_id, window, due_time) "
+                    "VALUES (999, 'morning', NULL)"
+                )
+            )
+    finally:
+        _run(database.close())
+
+
+def test_quest_definition_assignees_multiple_children_allowed(
+    tmp_path,
+) -> None:
+    database = _open_db(tmp_path / "assignees-multi.db")
+    try:
+        _apply(database)
+        for name in ("Ada", "Ben", "Cleo"):
+            _run(
+                database.execute(
+                    "INSERT INTO children (display_name, created_at) "
+                    "VALUES (?, ?)",
+                    (name, "2026-09-13T00:00:00+00:00"),
+                )
+            )
+        _insert_rule(database)
+        definition_id = _insert_definition(database, assignees=(1, 2, 3))
+        rows = _run(
+            database.fetch_all(
+                "SELECT child_id FROM quest_definition_assignees "
+                "WHERE definition_id = ? ORDER BY child_id",
+                (definition_id,),
+            )
+        )
+        assert [row[0] for row in rows] == [1, 2, 3]
     finally:
         _run(database.close())
 
@@ -863,7 +1175,7 @@ def test_quest_definitions_unknown_schedule_rule_id_fails(tmp_path) -> None:
             )
         )
         with pytest.raises(sqlite3.IntegrityError, match="FOREIGN KEY"):
-            _insert_definition(database, child_id=1, rule_id=999)
+            _insert_definition(database, rule_id=999)
     finally:
         _run(database.close())
 
@@ -874,7 +1186,7 @@ def test_quest_definitions_is_active_check_enforced(tmp_path) -> None:
         _apply(database)
         _insert_rule(database)
         with pytest.raises(sqlite3.IntegrityError, match="CHECK"):
-            _insert_definition(database, child_id=1, rule_id=1, is_active=2)
+            _insert_definition(database, rule_id=1, is_active=2)
     finally:
         _run(database.close())
 
@@ -895,7 +1207,7 @@ def test_quest_definitions_is_active_non_integer_fails(
         _insert_rule(database)
         with pytest.raises(sqlite3.IntegrityError, match="CHECK"):
             _insert_definition(
-                database, child_id=1, rule_id=1, is_active=bad_is_active
+                database, rule_id=1, is_active=bad_is_active
             )
     finally:
         _run(database.close())
@@ -907,7 +1219,7 @@ def test_quest_definitions_title_not_null_enforced(tmp_path) -> None:
         _apply(database)
         _insert_rule(database)
         with pytest.raises(sqlite3.IntegrityError, match="NOT NULL"):
-            _insert_definition(database, child_id=1, rule_id=1, title=None)
+            _insert_definition(database, rule_id=1, title=None)
     finally:
         _run(database.close())
 
@@ -919,7 +1231,7 @@ def test_quest_definitions_created_at_not_null_enforced(tmp_path) -> None:
         _insert_rule(database)
         with pytest.raises(sqlite3.IntegrityError, match="NOT NULL"):
             _insert_definition(
-                database, child_id=1, rule_id=1, created_at=None
+                database, rule_id=1, created_at=None
             )
     finally:
         _run(database.close())
@@ -937,7 +1249,7 @@ def test_quest_definitions_defaults_apply_on_insert(tmp_path) -> None:
         )
         _insert_rule(database)
         definition_id = _insert_definition(
-            database, child_id=1, rule_id=1, is_active=_OMIT
+            database, rule_id=1, is_active=_OMIT
         )
         row = _run(
             database.fetch_one(
@@ -966,7 +1278,7 @@ def test_applying_extended_ddl_twice_keeps_new_table_rows(tmp_path) -> None:
             )
         )
         _insert_rule(database)
-        _insert_definition(database, child_id=1, rule_id=1)
+        _insert_definition(database, rule_id=1)
         _apply(database)
         counts = []
         for table in ("children", "schedule_rules", "quest_definitions"):
@@ -1410,8 +1722,8 @@ def test_applying_presence_ddl_twice_keeps_rows(tmp_path) -> None:
 # ---------------------------------------------------------------------------
 
 
-def _insert_instance(database, definition_id=1, **overrides):
-    """Insert one valid task_instance, returning the instance id.
+def _insert_instance(database, definition_id=1, window="morning", **overrides):
+    """Insert one valid quest_instance, returning the instance id.
 
     Pass ``_OMIT`` as a value to leave that column out of the INSERT so
     its DDL DEFAULT applies.
@@ -1419,6 +1731,7 @@ def _insert_instance(database, definition_id=1, **overrides):
     values: dict[str, object] = {
         "definition_id": definition_id,
         "child_id": 1,
+        "window": window,
         "due_date": "2026-09-14",
         "generated_at": "2026-09-14T00:00:00+00:00",
     }
@@ -1469,7 +1782,7 @@ def _setup_definition(database) -> None:
     """Create one child, one schedule rule and one quest definition."""
     _child(database)
     _insert_rule(database)
-    _insert_definition(database, child_id=1, rule_id=1)
+    _insert_definition(database, rule_id=1)
 
 
 # ---------------------------------------------------------------------------
@@ -1517,6 +1830,7 @@ def test_quest_instances_columns_types_and_constraints(tmp_path) -> None:
             ("id", "INTEGER", 0, None, 1),
             ("definition_id", "INTEGER", 1, None, 0),
             ("child_id", "INTEGER", 1, None, 0),
+            ("window", "TEXT", 1, None, 0),
             ("due_date", "TEXT", 1, None, 0),
             ("due_time", "TEXT", 0, None, 0),
             ("generated_at", "TEXT", 1, None, 0),
@@ -1537,6 +1851,7 @@ def test_completion_events_columns_types_and_constraints(tmp_path) -> None:
             ("event_type", "TEXT", 1, None, 0),
             ("actor_source", "TEXT", 1, None, 0),
             ("actor_user_id", "TEXT", 0, None, 0),
+            ("actor_child_id", "INTEGER", 0, None, 0),
             ("occurred_at", "TEXT", 1, None, 0),
             ("was_on_time", "INTEGER", 0, None, 0),
         ]
@@ -1567,12 +1882,13 @@ def test_completion_events_foreign_keys_declared(tmp_path) -> None:
         assert declared == {
             ("quest_instances", "instance_id", "id"),
             ("children", "child_id", "id"),
+            ("children", "actor_child_id", "id"),
         }
     finally:
         _run(database.close())
 
 
-def test_quest_instances_unique_index_on_definition_and_date(tmp_path) -> None:
+def test_quest_instances_unique_index_on_widened_key(tmp_path) -> None:
     database = _open_db(tmp_path / "task-instances-unique.db")
     try:
         _apply(database)
@@ -1585,15 +1901,20 @@ def test_quest_instances_unique_index_on_definition_and_date(tmp_path) -> None:
         )
         implicit = [(name, sql) for name, sql in rows if sql is None]
         assert len(implicit) == 1, (
-            "the (definition_id, due_date) UNIQUE constraint must be backed "
-            "by exactly one implicit unique index"
+            "the (definition_id, child_id, due_date, window) UNIQUE "
+            "constraint must be backed by exactly one implicit unique index"
         )
         columns = _run(
             database.fetch_all(
                 f"PRAGMA index_info('{implicit[0][0]}')"
             )
         )
-        assert [row[2] for row in columns] == ["definition_id", "due_date"]
+        assert [row[2] for row in columns] == [
+            "definition_id",
+            "child_id",
+            "due_date",
+            "window",
+        ]
         # The implicit index is genuinely unique: UNIQUE(...) is the only
         # constraint SQLite backs with a sql-less autoindex on this table.
         row = _run(
@@ -1620,12 +1941,16 @@ def test_quest_instances_valid_insert_round_trips(tmp_path) -> None:
         instance_id = _insert_instance(database, definition_id=1, child_id=1)
         row = _run(
             database.fetch_one(
-                "SELECT definition_id, child_id, due_date, due_time, generated_at "
+                "SELECT definition_id, child_id, window, due_date, "
+                "due_time, generated_at "
                 "FROM quest_instances WHERE id = ?",
                 (instance_id,),
             )
         )
-        assert row == (1, 1, "2026-09-14", None, "2026-09-14T00:00:00+00:00")
+        assert row == (
+            1, 1, "morning", "2026-09-14", None,
+            "2026-09-14T00:00:00+00:00",
+        )
     finally:
         _run(database.close())
 
@@ -1649,7 +1974,7 @@ def test_quest_instances_due_time_round_trips(tmp_path) -> None:
         _run(database.close())
 
 
-def test_quest_instances_duplicate_definition_date_fails(tmp_path) -> None:
+def test_quest_instances_duplicate_tuple_fails(tmp_path) -> None:
     database = _open_db(tmp_path / "task-instances-duplicate.db")
     try:
         _apply(database)
@@ -1661,6 +1986,78 @@ def test_quest_instances_duplicate_definition_date_fails(tmp_path) -> None:
         _run(database.close())
 
 
+def test_quest_instances_duplicate_tuple_different_child_allowed(
+    tmp_path,
+) -> None:
+    """D-008: same definition, date and window for two different
+    assignees of the same definition are two distinct instances."""
+    database = _open_db(tmp_path / "task-instances-shared.db")
+    try:
+        _apply(database)
+        _setup_definition(database)
+        _run(
+            database.execute(
+                "INSERT INTO children (display_name, created_at) VALUES (?, ?)",
+                ("Bo", "2026-09-13T00:00:00+00:00"),
+            )
+        )
+        _run(
+            database.execute(
+                "INSERT INTO quest_definition_assignees "
+                "(definition_id, child_id) VALUES (1, 2)"
+            )
+        )
+        _insert_instance(database, definition_id=1, child_id=1)
+        _insert_instance(database, definition_id=1, child_id=2)
+        row = _run(database.fetch_one("SELECT COUNT(*) FROM quest_instances"))
+        assert row == (2,)
+    finally:
+        _run(database.close())
+
+
+def test_quest_instances_duplicate_tuple_different_window_allowed(
+    tmp_path,
+) -> None:
+    """D-008 twice-daily case: one definition, one child, one date,
+    two windows — two rows."""
+    database = _open_db(tmp_path / "task-instances-twice-daily.db")
+    try:
+        _apply(database)
+        _setup_definition(database)
+        _insert_instance(database, definition_id=1, window="morning")
+        _insert_instance(database, definition_id=1, window="evening")
+        rows = _run(
+            database.fetch_all(
+                "SELECT window FROM quest_instances ORDER BY window"
+            )
+        )
+        assert [row[0] for row in rows] == ["evening", "morning"]
+    finally:
+        _run(database.close())
+
+
+def test_quest_instances_unknown_window_fails(tmp_path) -> None:
+    database = _open_db(tmp_path / "task-instances-bad-window.db")
+    try:
+        _apply(database)
+        _setup_definition(database)
+        with pytest.raises(sqlite3.IntegrityError, match="CHECK"):
+            _insert_instance(database, definition_id=1, window="noon")
+    finally:
+        _run(database.close())
+
+
+def test_quest_instances_window_not_null_enforced(tmp_path) -> None:
+    database = _open_db(tmp_path / "task-instances-window-null.db")
+    try:
+        _apply(database)
+        _setup_definition(database)
+        with pytest.raises(sqlite3.IntegrityError, match="NOT NULL"):
+            _insert_instance(database, definition_id=1, window=_OMIT)
+    finally:
+        _run(database.close())
+
+
 def test_quest_instances_same_date_different_definitions_allowed(
     tmp_path,
 ) -> None:
@@ -1675,7 +2072,7 @@ def test_quest_instances_same_date_different_definitions_allowed(
             )
         )
         rule_id = _insert_rule(database)
-        _insert_definition(database, child_id=2, rule_id=rule_id)
+        _insert_definition(database, rule_id=rule_id, assignees=(2,))
         _insert_instance(database, definition_id=1, due_date="2026-09-14")
         _insert_instance(database, definition_id=2, due_date="2026-09-14")
         row = _run(database.fetch_one("SELECT COUNT(*) FROM quest_instances"))
@@ -1787,16 +2184,71 @@ def test_completion_events_valid_panel_completion_round_trips(tmp_path) -> None:
             instance_id=instance_id,
             actor_source="panel",
             actor_user_id=None,
+            actor_child_id=1,
             was_on_time=0,
         )
         row = _run(
             database.fetch_one(
-                "SELECT actor_source, actor_user_id, was_on_time "
-                "FROM completion_events WHERE id = ?",
+                "SELECT actor_source, actor_user_id, actor_child_id, "
+                "was_on_time FROM completion_events WHERE id = ?",
                 (event_id,),
             )
         )
-        assert row == ("panel", None, 0)
+        assert row == ("panel", None, 1, 0)
+    finally:
+        _run(database.close())
+
+
+@pytest.mark.parametrize(
+    ("actor_source", "actor_user_id", "actor_child_id"),
+    [
+        ("user", "user-1", 1),  # admin event must not carry a profile
+        ("panel", None, None),  # panel event requires the profile
+        ("panel", "user-1", 1),  # panel must not carry a user id either
+        ("panel", "user-1", None),
+        ("user", None, None),
+    ],
+)
+def test_completion_events_actor_child_coherence_enforced(
+    tmp_path, actor_source, actor_user_id, actor_child_id
+) -> None:
+    """D-008 actor-pair shape: 'user' events carry actor_user_id and no
+    actor_child_id; 'panel' events carry actor_child_id and no
+    actor_user_id.  The CHECKs make both halves non-negotiable."""
+    database = _open_db(tmp_path / "completion-events-coherence.db")
+    try:
+        _apply(database)
+        _setup_definition(database)
+        instance_id = _insert_instance(database, definition_id=1)
+        with pytest.raises(sqlite3.IntegrityError, match="CHECK"):
+            _insert_event(
+                database,
+                instance_id=instance_id,
+                event_type="completed",
+                actor_source=actor_source,
+                actor_user_id=actor_user_id,
+                actor_child_id=actor_child_id,
+                was_on_time=1,
+            )
+    finally:
+        _run(database.close())
+
+
+def test_completion_events_actor_child_unknown_child_fails(tmp_path) -> None:
+    database = _open_db(tmp_path / "completion-events-bad-actor-child.db")
+    try:
+        _apply(database)
+        _setup_definition(database)
+        instance_id = _insert_instance(database, definition_id=1)
+        with pytest.raises(sqlite3.IntegrityError, match="FOREIGN KEY"):
+            _insert_event(
+                database,
+                instance_id=instance_id,
+                actor_source="panel",
+                actor_user_id=None,
+                actor_child_id=999,
+                was_on_time=1,
+            )
     finally:
         _run(database.close())
 

tests/test_services.py

@@ -0,0 +1,41 @@
+"""Tests for the NestQuest services.yaml declaration file."""
+from __future__ import annotations
+
+import re
+from pathlib import Path
+
+SERVICES_PATH = (
+    Path(__file__).parent.parent
+    / "custom_components"
+    / "nestquest"
+    / "services.yaml"
+)
+
+
+def test_services_yaml_exists() -> None:
+    assert SERVICES_PATH.exists(), f"services.yaml missing at {SERVICES_PATH}"
+
+
+def test_services_yaml_declares_regenerate() -> None:
+    text = SERVICES_PATH.read_text(encoding="utf-8")
+    assert re.search(r"^regenerate:\s*$", text, re.MULTILINE), (
+        "services.yaml must declare the 'regenerate' service"
+    )
+
+
+def test_services_yaml_regenerate_has_description_and_no_fields() -> None:
+    """The regenerate service is documented with a clear description and no
+    required fields (there is no ``fields`` block under it)."""
+    text = SERVICES_PATH.read_text(encoding="utf-8")
+    match = re.search(r"^regenerate:\s*$", text, re.MULTILINE)
+    assert match is not None
+    section = text[match.end():]
+    next_service = re.search(r"^(?![#\s])\w+:\s*$", section, re.MULTILINE)
+    if next_service is not None:
+        section = section[: next_service.start()]
+    assert re.search(r"description:", section), (
+        "regenerate must carry a description"
+    )
+    assert "fields:" not in section, (
+        "regenerate declares no required fields"
+    )

tests/test_timezones.py

@@ -0,0 +1,370 @@
+"""Timezone tests for the single HA-local date source in the generation path.
+
+These pin the done-condition that every "today" read in the generation path
+derives from ``hass.config.time_zone`` — not the host clock and not UTC —
+and that the rolling horizon ``[today, today + DEFAULT_HORIZON_DAYS]`` and the
+no-past guard resolve the correct local dates around midnight and across the
+daylight-saving transitions.
+"""
+from __future__ import annotations
+
+import asyncio
+import datetime
+from types import SimpleNamespace
+from zoneinfo import ZoneInfo
+
+from custom_components.nestquest.const import DEFAULT_HORIZON_DAYS
+from custom_components.nestquest.dao_children import ChildrenDao
+from custom_components.nestquest.dao_instances import QuestInstancesDao
+from custom_components.nestquest.db import NestQuestDatabase
+from custom_components.nestquest.migrations import apply_migrations
+from custom_components.nestquest.quest_definitions import (
+    assign_child,
+    create_quest_definition,
+    edit_quest_definition,
+)
+from custom_components.nestquest.recurrence import RuleType, ScheduleRule
+
+NOW = "2026-09-14T12:00:00+00:00"
+NEW_YORK = "America/New_York"
+
+
+def _make_hass_mock():
+    from unittest.mock import AsyncMock, MagicMock
+
+    hass = MagicMock()
+    hass.async_add_executor_job = AsyncMock(side_effect=(lambda fn, *a: fn(*a)))
+    return hass
+
+
+async def _prepare(path):
+    database = NestQuestDatabase(_make_hass_mock())
+    await database.open(path)
+    await apply_migrations(database)
+    return database
+
+
+def _run(coro):
+    return asyncio.new_event_loop().run_until_complete(coro)
+
+
+def _freeze_clock(
+    monkeypatch, instant: datetime.datetime
+) -> tuple[datetime.datetime, list]:
+    """Freeze the integration's ``datetime`` clock to a fixed aware instant.
+
+    Only ``custom_components.nestquest``'s ``datetime`` binding is patched, so
+    the generation path's "today" reads this instant (localized to whatever
+    time zone it asks for) while every other module and the test harness keep
+    the real clock.  Returns ``(frozen, requested)`` where ``frozen`` is the
+    instant normalized to UTC and ``requested`` is the list of ``tzinfo``
+    objects the code under test passed to ``now`` — so a test can prove the
+    generation path actually requested the configured HA time zone rather
+    than silently reading UTC.
+    """
+    import custom_components.nestquest as nestquest
+
+    frozen = instant.astimezone(datetime.timezone.utc)
+    requested: list = []
+
+    class _FrozenDatetime(datetime.datetime):
+        @classmethod
+        def now(cls, tz=None):
+            requested.append(tz)
+            if tz is None:
+                return frozen.replace(tzinfo=None)
+            return frozen.astimezone(tz)
+
+    fake_module = SimpleNamespace(
+        datetime=_FrozenDatetime,
+        timedelta=datetime.timedelta,
+        date=datetime.date,
+    )
+    monkeypatch.setattr(nestquest, "datetime", fake_module)
+    return frozen, requested
+
+
+def _assert_requested_ha_timezone(requested, time_zone: str) -> None:
+    """Assert ``now`` was called with (only) the configured HA time zone.
+
+    This is what turns the DST tests into a real proof of the HA-local date
+    source: if the generation path regressed to ``now(timezone.utc)``, its
+    requested tz would be UTC and this fails.
+    """
+    assert requested, "the generation path never called now(tz)"
+    assert all(tz == ZoneInfo(time_zone) for tz in requested)
+
+
+def _tz_hass(time_zone: str):
+    """A minimal hass exposing only the ``config.time_zone`` the walk reads."""
+    return SimpleNamespace(config=SimpleNamespace(time_zone=time_zone))
+
+
+async def _seed_daily(database, start_iso: str) -> int:
+    """One always-present child + a daily definition starting ``start_iso``."""
+    child = await ChildrenDao(database).create("Ada", NOW)
+    await create_quest_definition(
+        database,
+        "Daily chore",
+        ScheduleRule(rule_type=RuleType.DAILY, start_date=start_iso),
+        [child.id],
+        ["morning"],
+    )
+    return child.id
+
+
+def _local_date(instant_utc: datetime.datetime, time_zone: str) -> datetime.date:
+    return instant_utc.astimezone(ZoneInfo(time_zone)).date()
+
+
+def _assert_contiguous_horizon(records, local_today: datetime.date) -> None:
+    """The horizon is exactly today..today+horizon, no off-by-one, no gap."""
+    expected = {
+        (local_today + datetime.timedelta(days=offset)).isoformat()
+        for offset in range(DEFAULT_HORIZON_DAYS + 1)
+    }
+    assert {r.due_date for r in records} == expected
+    assert len(records) == DEFAULT_HORIZON_DAYS + 1
+
+
+def test_horizon_uses_newyork_local_date_after_local_midnight(
+    tmp_path, monkeypatch
+) -> None:
+    """A run just after New York local midnight uses the local date.
+
+    The frozen instant is 00:05 New York local time on 2026-03-10 (EDT, so
+    04:05 UTC).  The horizon must start on 2026-03-10 — the local calendar
+    date — not any host/UTC-derived value.
+    """
+    instant = datetime.datetime(
+        2026, 3, 10, 0, 5, tzinfo=ZoneInfo(NEW_YORK)
+    )
+    local_today = instant.date()
+
+    async def _body(database):
+        hass = _tz_hass(NEW_YORK)
+        _frozen, requested = _freeze_clock(monkeypatch, instant)
+        import custom_components.nestquest as nestquest
+
+        child_id = await _seed_daily(database, local_today.isoformat())
+        await nestquest._run_horizon_materialization(hass, database)
+        records = await QuestInstancesDao(database).list_by_date_range(
+            child_id,
+            local_today.isoformat(),
+            (local_today + datetime.timedelta(days=DEFAULT_HORIZON_DAYS)).isoformat(),
+        )
+        _assert_contiguous_horizon(records, local_today)
+        _assert_requested_ha_timezone(requested, NEW_YORK)
+        return len(records)
+
+    async def _main():
+        database = await _prepare(tmp_path / "tz-midnight.db")
+        try:
+            return await _body(database)
+        finally:
+            await database.close()
+
+    assert _run(_main()) == DEFAULT_HORIZON_DAYS + 1
+
+
+def test_horizon_uses_local_date_not_utc_when_host_ahead(
+    tmp_path, monkeypatch
+) -> None:
+    """The walk's "today" is HA-local, never the UTC/system calendar date.
+
+    FROZEN at 2026-01-15 03:00 UTC: the UTC calendar date is 2026-01-15, but
+    New York local is still 2026-01-14 22:00 EST.  The horizon must start on
+    2026-01-14 (local), proving the UTC date did not win.
+    """
+    instant = datetime.datetime(2026, 1, 15, 3, 0, tzinfo=datetime.timezone.utc)
+    local_today = _local_date(instant, NEW_YORK)
+    assert local_today == datetime.date(2026, 1, 14)
+    assert instant.date() == datetime.date(2026, 1, 15)
+
+    async def _body(database):
+        hass = _tz_hass(NEW_YORK)
+        _frozen, requested = _freeze_clock(monkeypatch, instant)
+        import custom_components.nestquest as nestquest
+
+        child_id = await _seed_daily(database, local_today.isoformat())
+        await nestquest._run_horizon_materialization(hass, database)
+        records = await QuestInstancesDao(database).list_by_date_range(
+            child_id,
+            local_today.isoformat(),
+            (local_today + datetime.timedelta(days=DEFAULT_HORIZON_DAYS)).isoformat(),
+        )
+        _assert_contiguous_horizon(records, local_today)
+        _assert_requested_ha_timezone(requested, NEW_YORK)
+        return len(records)
+
+    async def _main():
+        database = await _prepare(tmp_path / "tz-host-ahead.db")
+        try:
+            return await _body(database)
+        finally:
+            await database.close()
+
+    assert _run(_main()) == DEFAULT_HORIZON_DAYS + 1
+
+
+def test_horizon_resolves_spring_forward_day_without_off_by_one(
+    tmp_path, monkeypatch
+) -> None:
+    """Across the 2026-03-08 spring-forward, today and the horizon stay local.
+
+    Before the jump ("01:30 EST") and after it ("03:30 EDT") both resolve to
+    2026-03-08 local — the lost hour must not skip or repeat a calendar day —
+    and the full horizon remains 15 contiguous days.
+    """
+    zone = ZoneInfo(NEW_YORK)
+    before = datetime.datetime(2026, 3, 8, 1, 30, tzinfo=zone)  # EST
+    after = datetime.datetime(2026, 3, 8, 3, 30, tzinfo=zone)   # EDT
+    assert before.date() == after.date() == datetime.date(2026, 3, 8)
+
+    async def _body(database):
+        hass = _tz_hass(NEW_YORK)
+        import custom_components.nestquest as nestquest
+
+        requested_batches: list[list] = []
+        for instant in (before, after):
+            _frozen, requested = _freeze_clock(monkeypatch, instant)
+            requested_batches.append(requested)
+            local_today = instant.date()
+            child_id = await _seed_daily(database, local_today.isoformat())
+            await nestquest._run_horizon_materialization(hass, database)
+            records = await QuestInstancesDao(database).list_by_date_range(
+                child_id,
+                local_today.isoformat(),
+                (local_today + datetime.timedelta(days=DEFAULT_HORIZON_DAYS)).isoformat(),
+            )
+            _assert_contiguous_horizon(records, local_today)
+        requested_all = [tz for batch in requested_batches for tz in batch]
+        _assert_requested_ha_timezone(requested_all, NEW_YORK)
+        return local_today
+
+    async def _main():
+        database = await _prepare(tmp_path / "tz-spring-forward.db")
+        try:
+            return await _body(database)
+        finally:
+            await database.close()
+
+    assert _run(_main()) == datetime.date(2026, 3, 8)
+
+
+def test_horizon_resolves_fall_back_day_without_off_by_one(
+    tmp_path, monkeypatch
+) -> None:
+    """Across the 2026-11-01 fall-back, today and the horizon stay local.
+
+    The repeated 01:00-02:00 hour must not resolve to the wrong calendar
+    day: the first 01:30 (``fold=0``, EDT) and the repeated 01:30
+    (``fold=1``, EST) are distinct instants yet both resolve to 2026-11-01
+    — and both, along with 03:30 EST after the jump, materialize the same
+    15 contiguous-day horizon with no off-by-one.
+    """
+    zone = ZoneInfo(NEW_YORK)
+    first = datetime.datetime(2026, 11, 1, 1, 30, tzinfo=zone, fold=0)  # EDT
+    second = datetime.datetime(2026, 11, 1, 1, 30, tzinfo=zone, fold=1)  # EST
+    after = datetime.datetime(2026, 11, 1, 3, 30, tzinfo=zone)  # EST
+    assert first.date() == second.date() == after.date() == datetime.date(2026, 11, 1)
+    assert first.utcoffset() != second.utcoffset()  # the two repeated-hour folds
+
+    async def _body(database):
+        hass = _tz_hass(NEW_YORK)
+        import custom_components.nestquest as nestquest
+
+        requested_batches: list[list] = []
+        for instant in (first, second, after):
+            _frozen, requested = _freeze_clock(monkeypatch, instant)
+            requested_batches.append(requested)
+            local_today = instant.date()
+            child_id = await _seed_daily(database, local_today.isoformat())
+            await nestquest._run_horizon_materialization(hass, database)
+            records = await QuestInstancesDao(database).list_by_date_range(
+                child_id,
+                local_today.isoformat(),
+                (local_today + datetime.timedelta(days=DEFAULT_HORIZON_DAYS)).isoformat(),
+            )
+            _assert_contiguous_horizon(records, local_today)
+        requested_all = [tz for batch in requested_batches for tz in batch]
+        _assert_requested_ha_timezone(requested_all, NEW_YORK)
+        return local_today
+
+    async def _main():
+        database = await _prepare(tmp_path / "tz-fall-back.db")
+        try:
+            return await _body(database)
+        finally:
+            await database.close()
+
+    assert _run(_main()) == datetime.date(2026, 11, 1)
+
+
+def test_definition_business_regeneration_uses_pinned_today_not_host(
+    tmp_path, monkeypatch
+) -> None:
+    """``edit_quest_definition``/``assign_child`` anchor regeneration on
+    the caller-pinned HA-local ``today``, not the host clock.
+
+    The host clock (the ``_today`` fallback) is pinned one day AHEAD of the
+    HA-local ``today``; the guard would reject the local "today" as past
+    (and the horizon would skip it) if it consulted the host clock.  Both
+    business operations must regenerate against the pinned date and keep
+    that first local day, proving the threaded ``today`` wins.
+    """
+    import custom_components.nestquest.dao_instances as dao_instances_module
+
+    pinned = datetime.date(2026, 1, 14)
+    host_today = datetime.date(2026, 1, 15)
+    monkeypatch.setattr(dao_instances_module, "_today", lambda: host_today)
+
+    async def _body(database):
+        children = ChildrenDao(database)
+        dao = QuestInstancesDao(database)
+        horizon_end = pinned + datetime.timedelta(days=DEFAULT_HORIZON_DAYS)
+
+        a = await children.create("Ada", NOW)
+        created = await create_quest_definition(
+            database,
+            "Daily chore",
+            ScheduleRule(rule_type=RuleType.DAILY, start_date=pinned.isoformat()),
+            [a.id],
+            [("morning", "09:00")],
+        )
+        definition_id = created.definition.id
+
+        # edit anchors on pinned: the horizon starts at the local day the
+        # host clock calls "past", so its presence proves pinned won.
+        await edit_quest_definition(
+            database,
+            definition_id,
+            windows=[("morning", "10:15")],
+            today=pinned,
+        )
+        a_records = await dao.list_by_date_range(
+            a.id, pinned.isoformat(), horizon_end.isoformat()
+        )
+        assert [r.due_date for r in a_records][0] == pinned.isoformat()
+        assert {r.due_time for r in a_records} == {"10:15"}
+        assert len(a_records) == DEFAULT_HORIZON_DAYS + 1
+
+        # assign anchors on pinned too: the new child's regeneration keeps
+        # the same pinned-local first day rather than skipping to the host day.
+        b = await children.create("Bo", NOW)
+        await assign_child(database, definition_id, b.id, today=pinned)
+        b_records = await dao.list_by_date_range(
+            b.id, pinned.isoformat(), horizon_end.isoformat()
+        )
+        assert [r.due_date for r in b_records][0] == pinned.isoformat()
+        assert len(b_records) == DEFAULT_HORIZON_DAYS + 1
+        return definition_id
+
+    async def _main():
+        database = await _prepare(tmp_path / "tz-definition-regen.db")
+        try:
+            return await _body(database)
+        finally:
+            await database.close()
+
+    assert _run(_main()) is not None