Coordinator polls the API snapshot and rebuilds the sensors' data

Feature 18: the shared coordinator's refresh pass now fetches
GET /api/v1/panel/snapshot through the NestQuestApiClient and
reconstructs the exact core dataclasses (NestQuestSnapshot,
ChildDaySnapshot, QuestInstanceView) the Feature 10 entities read, so
sensor.py and binary_sensor.py are untouched and every entity_id and
attribute payload keeps its shape.

Why: the integration becomes an API client of the NestQuest service
instead of a second reader of the SQLite file, and the panel cards and
the four blueprints keep working without changes.

- snapshot_from_api_payload maps the route's JSON back onto the
  dataclasses field by field (state 'completed' -> 'done' so
  instance_payload renders 'completed' again; counts, presence,
  next_present, overdue, on_time, completed_at pass through verbatim;
  due_date is stamped from today_iso, the only date the route serves).
- The panel payload omits missed instances (D-009), so
  admin_instances can no longer carry missed rows — the admin surface
  for missed quests is the PWA reading the API directly. Documented in
  the module docstring and pinned by tests.
- An unconfigured panel token (the shipped default) gets a typed-error
  stub instead of a construction crash: setup succeeds, the first
  refresh fails cleanly, entities come up unavailable and HA's retry
  cycle applies. Fetch failures log the typed error and mark the
  entities unavailable while data keeps its last good snapshot.
- The runtime record registers before the first refresh so the refresh
  path always finds the live entry state; the update interval and the
  serialized forced-refresh behaviour are unchanged.
- Tests: a fixture snapshot drives the coordinator (stub client, no
  network) asserting per-child values, household rollups, cycle day,
  and the exact instance payload shape, plus unconfigured and
  failed-fetch cases; DB-seeded tests ride a lazy local-snapshot
  client through the same JSON path.

custom_components/nestquest/__init__.py

@@ -16,6 +16,7 @@ from homeassistant.core import HomeAssistant
 from homeassistant.exceptions import ConfigEntryNotReady
 from homeassistant.helpers.event import async_track_time_change
 
+from .api_client import NestQuestApiError
 from .const import (
     CONF_ADMIN_USER_IDS,
     CONF_UPDATE_INTERVAL,
@@ -26,7 +27,7 @@ from .const import (
 )
 from .core.settings import NestQuestSettings
 from .frontend import async_register_frontend
-from .coordinator import NestQuestCoordinator
+from .coordinator import NestQuestCoordinator, coordinator_client_from_entry
 from .db import NestQuestDatabase, make_database
 from .materialize import materialize as _materialize_run
 from .migrations import apply_migrations
@@ -490,18 +491,20 @@ async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
         _register_services(hass)
         # The shared Feature 10 coordinator: one refresh cycle every
         # entity reads from (CONF_UPDATE_INTERVAL seconds, default
-        # five minutes).  Created AFTER services so a failure below
+        # five minutes).  Since Feature 18 it polls the API service's
-        # unwinds them through the except path's listener handling.
+        # panel snapshot instead of reading the local database; an
+        # entry with no panel token yet gets the typed-error stub
+        # (unavailable entities, never a setup crash).  Created AFTER
+        # services so a failure below unwinds them through the except
+        # path's listener handling.
         coordinator = NestQuestCoordinator(
             hass,
             entry_id=entry.entry_id,
-            database=database,
+            api_client=coordinator_client_from_entry(hass, entry),
-            settings=settings,
             update_interval_seconds=entry.options.get(
                 CONF_UPDATE_INTERVAL, DEFAULT_UPDATE_INTERVAL
             ),
         )
-        await coordinator.async_config_entry_first_refresh()
         runtime_data = NestQuestRuntimeData(
             entry_id=entry.entry_id,
             settings=settings,
@@ -510,11 +513,24 @@ async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
             remove_time_change_listener=remove_time_change_listener,
             coordinator=coordinator,
         )
-        # runtime_data is assigned BEFORE the platforms forward so each
+        # The runtime record is registered BEFORE the first refresh:
-        # platform's async_setup_entry reads its coordinator off the
+        # the refresh path (and anything it calls) resolves the entry's
-        # entry (the HA runtime-data contract); a forward failure below
+        # runtime state through hass.data, and it must find the live
+        # database there — never a half-set-up entry.  The platforms
+        # forward below reads the coordinator off the entry
+        # (the HA runtime-data contract); a forward failure below
         # unwinds it through the except path.
+        hass.data[DOMAIN][entry.entry_id] = runtime_data
         entry.runtime_data = runtime_data
+        # The first refresh polls the API snapshot; an API failure
+        # (unconfigured token, API service down) does NOT crash setup:
+        # the coordinator reports last_update_success=False, entities
+        # come up unavailable, and HA's standard retry cycle applies
+        # once the API is reachable.  Any non-API error still raises.
+        try:
+            await coordinator.async_config_entry_first_refresh()
+        except NestQuestApiError:
+            pass
         await hass.config_entries.async_forward_entry_setups(entry, PLATFORMS)
     except BaseException:
         # A failure anywhere after the database is open must not leak the
@@ -552,6 +568,9 @@ async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
         raise
     assert remove_update_listener is not None
     assert remove_time_change_listener is not None
+    # The runtime record was already registered before the first
+    # refresh; re-assert the (unchanged) record so the return path
+    # stays readable as one registration site.
     hass.data[DOMAIN][entry.entry_id] = runtime_data
     return True
 

custom_components/nestquest/coordinator.py

@@ -1,4 +1,4 @@
-"""The shared NestQuest DataUpdateCoordinator (Feature 10).
+"""The shared NestQuest DataUpdateCoordinator (Feature 10, Feature 18).
 
 ONE refresh pass builds the whole entity snapshot: active children,
 today's instances with their derived states (open / done / missed via
@@ -7,40 +7,47 @@ per-child rollup counts.  Every Feature 10 entity reads
 ``coordinator.data`` — no entity queries the database itself, so one
 refresh updates the whole board coherently.
 
-"Today" and "now" are HA-local (``hass.config.time_zone``), never the
+Since Feature 18 the snapshot no longer comes from the local database:
-host clock and never UTC, matching the materialization and completion
+the coordinator polls the NestQuest API service's panel plane —
-layers.
+``GET /api/v1/panel/snapshot`` through
+:class:`~.api_client.NestQuestApiClient` on its update interval — and
+RECONSTRUCTS the same core dataclasses the local builder produced
+(:class:`~.core.snapshot.NestQuestSnapshot`,
+:class:`~.core.snapshot.ChildDaySnapshot`,
+:class:`~.core.snapshot.QuestInstanceView`).  ``sensor.py`` and
+``binary_sensor.py`` read ``coordinator.data`` and
+:func:`~.core.snapshot.instance_payload` exactly as before, so every
+entity_id and attribute payload shape is unchanged: the panel cards and
+the four blueprints keep working untouched.
 
-The snapshot assembly itself lives in the Home-Assistant-free
+One loss is deliberate and documented (D-009 revisited): the panel
-:mod:`custom_components.nestquest.core.snapshot` module
+payload OMITS missed instances, so a snapshot rebuilt from the API can
-(:func:`~core.snapshot.build_snapshot`); this coordinator is now a thin
+no longer carry them — ``admin_instances`` (``include_missed=True``)
-HA wrapper that resolves the local timezone and reads the settings handed
+now equals ``instances`` (they can hold only open and completed rows).
-into its constructor, then delegates to that builder, passing the SAME
+The admin surface for missed quests is the PWA, which reads the API
-HA-local ``now`` it resolved in one clock read.  The API service's panel
+service directly; the integration's entities never needed missed rows
-snapshot route shares the same builder, so both consumers render ONE
+for their states or counts (the counts arrive precomputed).
-snapshot shape.
 
-Presence is resolved through the SAME engine the materializer uses
+Failure handling: constructing the client fails fast (ValueError) when
-(:class:`~.presence.PresenceEngine`): schedules and overrides are read
+the entry has no panel token configured, and a fetch failure raises the
-with the public DAO methods and the engine's anchor-date arithmetic
+typed :class:`~.api_client.NestQuestApiError`.  Neither crashes
-answers ``is this child at this house today`` (D-004 — never ISO week
+integration setup: the constructor logs a clear message and hands back
-parity).
+a client-shaped stub whose refresh raises the same typed error, so the
-
+coordinator's refresh pass marks the entities unavailable
-``cycle_day`` reports where today falls in the custody cycle of the
+(``last_update_success = False``, ``data = None``) — exactly how a HA
-first active child (display order) that HAS a schedule — 1-based day
+``DataUpdateCoordinator`` surfaces a failed update.  The typed error is
-``N`` of ``cycle_length_weeks * 7``, computed from that schedule's
+never swallowed silently: it is logged with its message and chained.
-anchor date.  ``0`` means no active child has a schedule at all, so
-the admin header degrades to a harmless zero instead of guessing.
 """
 from __future__ import annotations
 
 import asyncio
 import datetime
-from zoneinfo import ZoneInfo
+from typing import Any
 
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.update_coordinator import DataUpdateCoordinator
 
+from .api_client import NestQuestApiClient, NestQuestApiError, resolve_api_config
 from .const import (
     CONF_UPDATE_INTERVAL,
     DEFAULT_UPDATE_INTERVAL,
@@ -48,13 +55,10 @@ from .const import (
     LOGGER,
     MIN_UPDATE_INTERVAL,
 )
-from .core.db import NestQuestDatabase
-from .core.settings import NestQuestSettings
 from .core.snapshot import (
     ChildDaySnapshot,
     NestQuestSnapshot,
     QuestInstanceView,
-    build_snapshot,
 )
 
 __all__ = [
@@ -65,9 +69,113 @@ __all__ = [
 ]
 
 
+def snapshot_from_api_payload(payload: dict[str, Any]) -> NestQuestSnapshot:
+    """Reconstruct the core snapshot dataclasses from the API's JSON.
+
+    The panel snapshot route (``api/routes_panel.py``) returns today's
+    household as plain JSON — ``today_iso``, ``cycle_day``, and the
+    per-child list with precomputed counts and the instances in the
+    documented payload shape.  This function maps that shape BACK onto
+    the dataclasses ``sensor.py`` / ``binary_sensor.py`` read, field by
+    field:
+
+    - the API's ``state`` ``"completed"`` maps back to the core view's
+      ``"done"`` (so :func:`~.core.snapshot.instance_payload` renders
+      ``"completed"`` again — the round-trip is identity for open and
+      completed rows);
+    - ``overdue``, ``on_time`` (→ ``was_on_time``), ``completed_at``,
+      ``window``, ``due_time``, ``icon`` and the per-child counts pass
+      through verbatim;
+    - ``present`` and ``next_present`` pass through verbatim (the API
+      resolved them through the same presence engine server-side);
+    - the instance list is rebuilt IN ORDER, so the panel payload the
+      sensors emit matches the route's order byte for byte.
+
+    Because the route omits missed instances (D-009), a snapshot built
+    here cannot contain any ``missed`` view — see the module docstring.
+    """
+    children: list[ChildDaySnapshot] = []
+    for child in payload.get("children", []):
+        views = tuple(
+            QuestInstanceView(
+                instance_id=instance["id"],
+                definition_id=instance["definition_id"],
+                child_id=instance["child_id"],
+                title=instance["title"],
+                icon=instance.get("icon"),
+                window=instance["window"],
+                # The API payload does not carry due_date: every row
+                # is TODAY's instance (the route queries
+                # [today, today]), so the view's due_date is the
+                # snapshot's today_iso — the same value the local
+                # builder stamped on every today row.
+                due_date=payload["today_iso"],
+                due_time=instance.get("due_time"),
+                state=(
+                    "done" if instance["state"] == "completed" else
+                    instance["state"]
+                ),
+                overdue=instance["overdue"],
+                completed_at=instance.get("completed_at"),
+                was_on_time=instance.get("on_time"),
+            )
+            for instance in child.get("instances", [])
+        )
+        children.append(
+            ChildDaySnapshot(
+                child_id=child["child_id"],
+                child_name=child["child_name"],
+                instances=views,
+                present=child["present"],
+                due_today=child["due_today"],
+                completed_today=child["completed_today"],
+                remaining_today=child["remaining_today"],
+                completion_pct=child["completion_pct"],
+                next_present=child.get("next_present"),
+            )
+        )
+    return NestQuestSnapshot(
+        today_iso=payload["today_iso"],
+        children=tuple(children),
+        cycle_day=payload["cycle_day"],
+    )
+
+
+class _UnconfiguredApiClient:
+    """Client-shaped stand-in used when the entry has no panel token.
+
+    Constructing a real :class:`~.api_client.NestQuestApiClient` with an
+    empty token raises ValueError by design (fail fast on a client that
+    could only ever 401).  An entry that simply has not been configured
+    yet must not crash integration setup, so the coordinator swaps in
+    this stub: every refresh raises the SAME typed
+    :class:`~.api_client.NestQuestApiError` a transport failure would,
+    carrying a clear "API not configured" message, so the coordinator
+    marks the entities unavailable and the HA standard retry cycle
+    applies.  The error is logged, never silent.
+    """
+
+    __slots__ = ()
+
+    async def get_snapshot(self) -> dict[str, Any]:
+        """Always raise: there is no configured API to fetch from."""
+        raise NestQuestApiError(
+            "NestQuest API not configured: set the panel token in the "
+            "integration options"
+        )
+
+
 class NestQuestCoordinator(DataUpdateCoordinator):
     """Shared refresh cycle for every NestQuest entity.
 
+    One refresh pass = one ``GET /api/v1/panel/snapshot`` through the
+    API client, reconstructed into the core snapshot dataclasses every
+    entity reads.  A failed pass (unconfigured API, transport failure,
+    non-2xx response) raises the typed error out of
+    ``_async_update_data``, so the coordinator's ``data`` keeps its last
+    good value while ``last_update_success`` goes False — HA marks the
+    entities unavailable until a later pass succeeds.
+
     Forced refreshes (the service paths pushing an immediate update
     after a completion) are SERIALIZED per entry: overlapping
     complete/uncomplete calls must not interleave their snapshot
@@ -82,8 +190,7 @@ class NestQuestCoordinator(DataUpdateCoordinator):
         hass: HomeAssistant,
         *,
         entry_id: str,
-        database: NestQuestDatabase,
+        api_client: NestQuestApiClient,
-        settings: NestQuestSettings,
         update_interval_seconds: int | None = None,
     ) -> None:
         interval = update_interval_seconds
@@ -100,8 +207,7 @@ class NestQuestCoordinator(DataUpdateCoordinator):
             update_interval=datetime.timedelta(seconds=interval),
         )
         self.entry_id = entry_id
-        self.database = database
+        self.api_client = api_client
-        self.settings = settings
         self._refresh_lock = asyncio.Lock()
 
     async def async_refresh(self) -> None:
@@ -111,12 +217,58 @@ class NestQuestCoordinator(DataUpdateCoordinator):
         async with self._refresh_lock:
             await super().async_refresh()
 
-    def _local_now(self) -> datetime.datetime:
-        time_zone = ZoneInfo(self.hass.config.time_zone)
-        return datetime.datetime.now(time_zone)
-
     async def _async_update_data(self) -> NestQuestSnapshot:
-        now = self._local_now()
+        try:
-        return await build_snapshot(
+            payload = await self.api_client.get_snapshot()
-            self.database, self.settings, now
+        except NestQuestApiError as err:
+            LOGGER.error(
+                "NestQuest coordinator refresh failed: %s", err
+            )
+            raise
+        return snapshot_from_api_payload(payload)
+
+
+def coordinator_client_from_entry(
+    hass: HomeAssistant, entry: Any, *, session_factory: Any = None
+) -> Any:
+    """Build the refresh client for a config entry, tolerating no token.
+
+    Reads ``(base_url, panel_token)`` off the entry and constructs the
+    real client.  An entry with no panel token configured (the shipped
+    default is the empty string) makes the constructor raise ValueError
+    by design; integration setup must not crash on an unconfigured
+    entry, so this factory swaps in the typed-error stub instead and
+    logs ONE clear message.  The ValueError itself is never re-raised
+    past this point — it is converted, with the reason logged.
+
+    ``session_factory`` overrides where the HTTP session comes from
+    (production: HA's shared aiohttp session via
+    :func:`~.api_client.client_from_entry`); it exists so tests can
+    inject a stub transport without importing aiohttp — the mock-only
+    test harness has no ``homeassistant.helpers.aiohttp_client``.
+    """
+    from custom_components.nestquest.api_client import NestQuestApiClient
+
+    base_url, panel_token = resolve_api_config(entry)
+    if not isinstance(panel_token, str) or not panel_token.strip():
+        LOGGER.warning(
+            "NestQuest API panel token is not configured for entry %s: "
+            "entities will stay unavailable until a token is set in the "
+            "integration options",
+            entry.entry_id,
         )
+        return _UnconfiguredApiClient()
+    if session_factory is not None:
+        return NestQuestApiClient(
+            base_url, panel_token, session_factory(hass)
+        )
+    from custom_components.nestquest.api_client import client_from_entry
+
+    return client_from_entry(hass, entry)
+
+
+#: Test seam: entry_id → client, consulted by the conftest's client
+#: factory BEFORE the production path.  Always empty in production
+#: (nothing in the integration writes to it); tests register scripted
+#: clients through it and clear it between tests.
+_COORDINATOR_CLIENT_OVERRIDES: dict[str, Any] = {}

tests/conftest.py

@@ -52,6 +52,7 @@ _HA_MODULES = (
     "homeassistant.helpers.entity",
     "homeassistant.helpers.event",
     "homeassistant.helpers.update_coordinator",
+    "homeassistant.helpers.aiohttp_client",
     "homeassistant.components",
     "homeassistant.components.sensor",
     "homeassistant.components.binary_sensor",
@@ -99,6 +100,7 @@ for _parent, _child in (
     ("homeassistant.helpers", "entity"),
     ("homeassistant.helpers", "event"),
     ("homeassistant.helpers", "update_coordinator"),
+    ("homeassistant.helpers", "aiohttp_client"),
     ("homeassistant", "components"),
     ("homeassistant.components", "sensor"),
     ("homeassistant.components", "binary_sensor"),
@@ -700,6 +702,125 @@ def wire_entry_to_registry(entry, registry: ListenerRegistry):
     return entry
 
 
+class LazyLocalSnapshotClient:
+    """A test client that serves the snapshot built LOCALLY.
+
+    Feature 18 moved the coordinator's refresh onto the API service's
+    panel snapshot, but most integration tests still seed the local
+    database directly (the DB removal is a later task).  This stub
+    bridges the two: ``get_snapshot`` resolves the entry's runtime
+    record (its database and settings) and runs the SAME pure core
+    builder the API route runs
+    (:func:`~custom_components.nestquest.core.snapshot.build_snapshot`),
+    shaping the payload exactly like ``api/routes_panel.py`` —
+    instances via ``instance_payload(include_missed=False)`` — so the
+    coordinator reconstructs from a byte-identical payload without any
+    network or FastAPI machinery.
+
+    The resolution is LAZY on purpose: the coordinator's factory runs
+    mid-setup, before the runtime record exists, so the first refresh
+    (and any refresh while the entry is torn down) serves an EMPTY but
+    valid snapshot; every later refresh reads the seeded database.
+    """
+
+    def __init__(self, hass, entry_id: str) -> None:
+        self._hass = hass
+        self._entry_id = entry_id
+        self.calls = 0
+
+    async def get_snapshot(self):
+        import datetime
+        import zoneinfo
+
+        from custom_components.nestquest.const import DOMAIN as NQ_DOMAIN
+        from custom_components.nestquest.core import snapshot as core_snapshot
+
+        self.calls += 1
+        runtime = self._hass.data.get(NQ_DOMAIN, {}).get(self._entry_id)
+        database = getattr(runtime, "database", None)
+        if database is None or not getattr(database, "connected", True):
+            return {
+                "today_iso": datetime.date.today().isoformat(),
+                "cycle_day": 0,
+                "children": [],
+            }
+        settings = getattr(runtime, "settings", None)
+        # The HA-LOCAL now, the same single clock read the production
+        # coordinator used to hand the builder: the hass stub's
+        # configured time zone, never the host clock.
+        now = datetime.datetime.now(
+            zoneinfo.ZoneInfo(self._hass.config.time_zone)
+        )
+        snapshot = await core_snapshot.build_snapshot(database, settings, now)
+        return {
+            "today_iso": snapshot.today_iso,
+            "cycle_day": snapshot.cycle_day,
+            "children": [
+                {
+                    "child_id": child.child_id,
+                    "child_name": child.child_name,
+                    "present": child.present,
+                    "next_present": child.next_present,
+                    "due_today": child.due_today,
+                    "completed_today": child.completed_today,
+                    "remaining_today": child.remaining_today,
+                    "completion_pct": child.completion_pct,
+                    "instances": core_snapshot.instance_payload(
+                        child.instances, include_missed=False
+                    ),
+                }
+                for child in snapshot.children
+            ],
+        }
+
+
+@pytest.fixture(autouse=True)
+def coordinator_serves_local_snapshot():
+    """Default every test entry's coordinator to the local-snapshot client.
+
+    The integration's setup builds its API client through
+    ``coordinator_client_from_entry``; the fixture swaps that factory
+    for a test one handing out :class:`LazyLocalSnapshotClient` (so
+    DB-seeded tests exercise the coordinator's API path against local
+    data).  Tests that script their own client register it with
+    :func:`set_coordinator_client`, which the factory honours first.
+    """
+    import custom_components.nestquest as nq_mod
+    import custom_components.nestquest.coordinator as coordinator_module
+    from custom_components.nestquest.coordinator import (
+        coordinator_client_from_entry as production_factory,
+    )
+
+    _COORDINATOR_CLIENT_OVERRIDES = (
+        coordinator_module._COORDINATOR_CLIENT_OVERRIDES
+    )
+
+    def _factory(hass, entry, **kwargs):
+        override = _COORDINATOR_CLIENT_OVERRIDES.get(entry.entry_id)
+        if override is not None:
+            return override
+        return LazyLocalSnapshotClient(hass, entry.entry_id)
+
+    import unittest.mock as mock
+
+    _COORDINATOR_CLIENT_OVERRIDES.clear()
+    patcher = mock.patch.object(
+        nq_mod, "coordinator_client_from_entry", _factory
+    )
+    patcher.start()
+    yield
+    patcher.stop()
+    _COORDINATOR_CLIENT_OVERRIDES.clear()
+
+
+def set_coordinator_client(entry, client):
+    """Register a scripted client for ``entry``'s coordinator factory."""
+    import custom_components.nestquest.coordinator as coordinator_module
+
+    coordinator_module._COORDINATOR_CLIENT_OVERRIDES[entry.entry_id] = client
+    return client
+
+
 class _HassNamespace(SimpleNamespace):
     """SimpleNamespace subclass so the hass stub can hold weak references."""
 

tests/test_coordinator.py

@@ -1,263 +1,452 @@
-"""Tests for the shared NestQuest coordinator (Feature 10, task 1)."""
+"""Tests for the shared NestQuest coordinator (Feature 10, Feature 18).
+
+The coordinator now polls the API service's panel snapshot through the
+API client (Feature 18) and reconstructs the core snapshot dataclasses
+every entity reads.  The tests stub the client — NO network, NO aiohttp
+— with a FIXTURE snapshot payload (the documented shape of the Feature
+16 snapshot route, ``api/routes_panel.py``) and assert the
+reconstruction: per-child counts and presence, the instance views
+(``completed`` mapped back to ``done``), the household rollups, the
+cycle day, and the unconfigured / failed-fetch behaviour.
+"""
 from __future__ import annotations
 
 import datetime
 
 import pytest
 
-from conftest import wire_entry_to_registry
+from conftest import set_coordinator_client, wire_entry_to_registry
 
 from custom_components.nestquest import async_setup_entry, async_unload_entry
-from custom_components.nestquest.children import (
+from custom_components.nestquest.api_client import (
-    create_child,
+    NestQuestApiClient,
-    list_children,
+    NestQuestApiError,
-    set_child_active,
 )
-from custom_components.nestquest.completion import complete_instance
 from custom_components.nestquest.const import (
     CONF_UPDATE_INTERVAL,
     DEFAULT_UPDATE_INTERVAL,
-    DEFAULT_HORIZON_DAYS,
     DOMAIN,
 )
-from custom_components.nestquest.coordinator import NestQuestCoordinator
+from custom_components.nestquest.coordinator import (
-from custom_components.nestquest.dao_presence import PresenceSchedulesDao
+    NestQuestCoordinator,
-from custom_components.nestquest.materialize import materialize
+    coordinator_client_from_entry,
-from custom_components.nestquest.quest_definitions import (
+    snapshot_from_api_payload,
-    create_quest_definition,
 )
-from custom_components.nestquest.recurrence import ScheduleRule
+from custom_components.nestquest.core.snapshot import instance_payload
-
-ADMIN_CTX = {"user_id": "admin-1"}
 
 
 def _today_iso() -> str:
     return datetime.date.today().isoformat()
 
 
-async def _seed_day(database, *, completed: bool = False) -> None:
+class StubSnapshotClient:
-    """Two active children + one inactive, one daily definition each."""
+    """A no-network stand-in for the API client's snapshot surface.
-    await create_child(database, "Ada")
+
-    await create_child(database, "Bo")
+    Answers ``get_snapshot()`` from a scripted queue of outcomes — a
-    inactive = await create_child(database, "Ghost")
+    payload dict or an exception per call, consumed in order — and
-    await set_child_active(database, inactive.id, False)
+    records every call, so each test drives exactly one refresh.
-    today = _today_iso()
+    """
-    await create_quest_definition(
+
-        database,
+    def __init__(self, *outcomes) -> None:
-        "Brush teeth",
+        self.calls = 0
-        ScheduleRule.from_dict({"rule_type": "daily", "start_date": today}),
+        self._outcomes = list(outcomes)
-        [child.id for child in await list_children(database, active_only=True)],
+        self._last = outcomes[-1] if outcomes else None
-        ["morning"],
+
+    async def get_snapshot(self):
+        self.calls += 1
+        if not self._outcomes:
+            # Re-serve the last outcome: setup's first refresh and the
+            # test's explicit pass both poll the same scripted state.
+            outcome = self._last
+        else:
+            outcome = self._outcomes.pop(0)
+            self._last = outcome
+        if isinstance(outcome, BaseException):
+            raise outcome
+        return outcome
+
+
+#: A fixture panel snapshot (the documented Feature 16 route shape):
+#: two children — Ada owes one, owes none of it yet, is away today with
+#: a returns date; Bo completed his only quest and is present.
+FIXTURE_SNAPSHOT = {
+    "today_iso": _today_iso(),
+    "cycle_day": 3,
+    "children": [
+        {
+            "child_id": 1,
+            "child_name": "Ada",
+            "present": False,
+            "next_present": "2026-09-24",
+            "due_today": 2,
+            "completed_today": 1,
+            "remaining_today": 1,
+            "completion_pct": 50,
+            "instances": [
+                {
+                    "id": 7,
+                    "definition_id": 3,
+                    "child_id": 1,
+                    "title": "Brush teeth",
+                    "icon": "🦷",
+                    "window": "morning",
+                    "due_time": "08:00",
+                    "state": "completed",
+                    "overdue": False,
+                    "completed_at": f"{_today_iso()}T07:55:00+00:00",
+                    "on_time": True,
+                },
+                {
+                    "id": 8,
+                    "definition_id": 3,
+                    "child_id": 1,
+                    "title": "Pack bag",
+                    "icon": None,
+                    "window": "morning",
+                    "due_time": "10:00",
+                    "state": "open",
+                    "overdue": True,
+                    "completed_at": None,
+                    "on_time": None,
+                },
+            ],
+        },
+        {
+            "child_id": 2,
+            "child_name": "Bo",
+            "present": True,
+            "next_present": None,
+            "due_today": 1,
+            "completed_today": 1,
+            "remaining_today": 0,
+            "completion_pct": 100,
+            "instances": [
+                {
+                    "id": 9,
+                    "definition_id": 4,
+                    "child_id": 2,
+                    "title": "Make bed",
+                    "icon": "🛏",
+                    "window": "morning",
+                    "due_time": "07:30",
+                    "state": "completed",
+                    "overdue": False,
+                    "completed_at": f"{_today_iso()}T07:31:00+00:00",
+                    "on_time": True,
+                }
+            ],
+        },
+    ],
+}
+
+
+async def _wire_entry(hass, make_entry, client, options=None):
+    """Build an entry whose coordinator uses the scripted API client.
+
+    The client is registered with the conftest override BEFORE setup:
+    the first refresh at setup already polls the snapshot, so the
+    platform setup sees real data and creates the whole entity set.
+    """
+    from conftest import set_coordinator_client
+
+    entry = wire_entry_to_registry(
+        make_entry(
+            options=options,
+            data={"api_base_url": "http://api.test:8000", "panel_token": "tok"},
+        ),
+        hass.registry,
     )
-    end = (
+    set_coordinator_client(entry, client)
-        datetime.date.today() + datetime.timedelta(days=DEFAULT_HORIZON_DAYS)
-    ).isoformat()
-    await materialize(database, today, end, today=datetime.date.today())
-
-
-async def test_coordinator_snapshot_counts_and_states(hass, make_entry) -> None:
-    entry = wire_entry_to_registry(make_entry(), hass.registry)
     assert await async_setup_entry(hass, entry) is True
     coordinator = entry.runtime_data.coordinator
-    assert coordinator is not None
+    assert coordinator.api_client is client
-    database = entry.runtime_data.database
+    return entry, coordinator
-    await _seed_day(database)
 
+
+async def test_coordinator_builds_snapshot_from_fixture(hass, make_entry) -> None:
+    """One refresh = one snapshot GET; the fixture's values land on the
+    snapshot the entities read, per child and household-wide."""
+    client = StubSnapshotClient(FIXTURE_SNAPSHOT)
+    _entry, coordinator = await _wire_entry(hass, make_entry, client)
+    calls_after_setup = client.calls
     snapshot = await coordinator._async_update_data()
+
+    assert client.calls == calls_after_setup + 1
     assert snapshot.today_iso == _today_iso()
-    assert len(snapshot.children) == 2, "inactive child must be absent"
+    assert snapshot.cycle_day == 3
-    by_name = {child.child_name: child for child in snapshot.children}
+    assert len(snapshot.children) == 2
-    ada = by_name["Ada"]
+
-    assert ada.due_today == 1
+    ada, bo = snapshot.children
-    assert ada.completed_today == 0
+    assert (ada.child_id, ada.child_name) == (1, "Ada")
+    assert ada.due_today == 2
+    assert ada.completed_today == 1
     assert ada.remaining_today == 1
-    assert ada.completion_pct == 0
+    assert ada.completion_pct == 50
-    instance = ada.instances[0]
+    assert ada.present is False
-    assert instance.state == "open"
+    assert ada.next_present == "2026-09-24"
-    assert instance.overdue is False
+
-    assert instance.title == "Brush teeth"
+    done_view, open_view = ada.instances
-    assert instance.window == "morning"
+    assert done_view.instance_id == 7
-    assert ada.present is True, "no schedule means present every day"
+    assert done_view.title == "Brush teeth"
-    assert ada.next_present is None, "present child has no returns date"
+    assert done_view.icon == "🦷"
-    assert snapshot.cycle_day == 0, "no schedule anywhere"
+    assert done_view.window == "morning"
+    assert done_view.due_time == "08:00"
+    assert done_view.due_date == _today_iso()
+    # The API's "completed" maps back to the core view's "done".
+    assert done_view.state == "done"
+    assert done_view.overdue is False
+    assert done_view.completed_at == f"{_today_iso()}T07:55:00+00:00"
+    assert done_view.was_on_time is True
+
+    assert open_view.state == "open"
+    assert open_view.overdue is True
+    assert open_view.completed_at is None
+    assert open_view.was_on_time is None
+
+    assert (bo.child_id, bo.child_name) == (2, "Bo")
+    assert bo.due_today == 1
+    assert bo.completed_today == 1
+    assert bo.remaining_today == 0
+    assert bo.completion_pct == 100
+    assert bo.present is True
+    assert bo.next_present is None
+
+    # Household rollups: the sums the household sensors compute.
+    assert sum(child.due_today for child in snapshot.children) == 3
+    assert sum(child.completed_today for child in snapshot.children) == 2
+    assert sum(child.remaining_today for child in snapshot.children) == 1
 
 
-async def test_coordinator_next_present_for_away_child(
+async def test_coordinator_refresh_publishes_to_listeners(hass, make_entry) -> None:
-    hass, make_entry
+    """The refresh pass notifies listeners and reports success — the
+    ONE refresh pass every entity reads from."""
+    client = StubSnapshotClient(FIXTURE_SNAPSHOT)
+    _entry, coordinator = await _wire_entry(hass, make_entry, client)
+    called = []
+    coordinator.async_add_listener(lambda: called.append("entity"))
+    await coordinator.async_refresh()
+    assert called == ["entity"]
+    assert coordinator.last_update_success is True
+    assert coordinator.data is not None
+    assert coordinator.data.children[0].child_name == "Ada"
+
+
+async def test_instance_payload_shape_is_unchanged(hass, make_entry) -> None:
+    """The per-child instance attribute payload the due-today sensor
+    emits keeps its exact documented shape, and admin_instances now
+    equals instances (the API omits missed rows — D-009; the admin
+    surface for missed quests is the PWA)."""
+    client = StubSnapshotClient(FIXTURE_SNAPSHOT)
+    _entry, coordinator = await _wire_entry(hass, make_entry, client)
+    snapshot = await coordinator._async_update_data()
+    ada = snapshot.children[0]
+
+    panel = instance_payload(ada.instances, include_missed=False)
+    assert panel == [
+        {
+            "id": 7,
+            "definition_id": 3,
+            "child_id": 1,
+            "title": "Brush teeth",
+            "icon": "🦷",
+            "window": "morning",
+            "due_time": "08:00",
+            "state": "completed",
+            "overdue": False,
+            "completed_at": f"{_today_iso()}T07:55:00+00:00",
+            "on_time": True,
+        },
+        {
+            "id": 8,
+            "definition_id": 3,
+            "child_id": 1,
+            "title": "Pack bag",
+            "icon": None,
+            "window": "morning",
+            "due_time": "10:00",
+            "state": "open",
+            "overdue": True,
+            "completed_at": None,
+            "on_time": None,
+        },
+    ]
+    # The API payload omits missed rows, so include_missed cannot
+    # re-add them: admin_instances == instances, byte for byte.
+    assert instance_payload(ada.instances, include_missed=True) == panel
+
+
+async def test_coordinator_entities_read_the_api_snapshot(hass, make_entry) -> None:
+    """The registered sensors and binary sensors read the rebuilt
+    snapshot: entity values come from the fixture, with the SAME
+    entity_ids as ever."""
+    client = StubSnapshotClient(FIXTURE_SNAPSHOT)
+    entry, coordinator = await _wire_entry(hass, make_entry, client)
+    await coordinator.async_refresh()
+
+    ada_due = hass.entities[f"{DOMAIN}_child_1_quests_due_today"]
+    assert ada_due.native_value == 2
+    attributes = ada_due.extra_state_attributes
+    assert attributes["child_id"] == 1
+    assert attributes["child_name"] == "Ada"
+    assert attributes["present"] is False
+    assert [row["id"] for row in attributes["instances"]] == [7, 8]
+
+    assert (
+        hass.entities[f"{DOMAIN}_child_1_quests_completed_today"].native_value
+        == 1
+    )
+    assert (
+        hass.entities[f"{DOMAIN}_child_1_quests_remaining_today"].native_value
+        == 1
+    )
+    assert (
+        hass.entities[f"{DOMAIN}_child_1_completion_pct_today"].native_value
+        == 50
+    )
+    assert hass.entities[f"{DOMAIN}_child_1_next_quest"].native_value == (
+        "Pack bag"
+    )
+    # Ada owes one still: not all done; away today.
+    assert hass.entities[f"{DOMAIN}_child_1_all_done"].is_on is False
+    assert hass.entities[f"{DOMAIN}_child_1_present_today"].is_on is False
+
+    assert (
+        hass.entities[f"{DOMAIN}_child_2_completion_pct_today"].native_value
+        == 100
+    )
+    # Bo had a quest and owes none of it: all done, present today.
+    assert hass.entities[f"{DOMAIN}_child_2_all_done"].is_on is True
+    assert hass.entities[f"{DOMAIN}_child_2_present_today"].is_on is True
+    bo_attributes = hass.entities[
+        f"{DOMAIN}_child_2_present_today"
+    ].extra_state_attributes
+    assert bo_attributes["next_present"] is None
+
+    assert (
+        hass.entities[f"{DOMAIN}_household_quests_due_today"].native_value == 3
+    )
+    assert (
+        hass.entities[f"{DOMAIN}_household_quests_completed_today"].native_value
+        == 2
+    )
+    cycle = hass.entities[f"{DOMAIN}_cycle_day"]
+    assert cycle.native_value == 3
+    assert cycle.extra_state_attributes == {
+        "cycle_day": 3,
+        "today": _today_iso(),
+    }
+
+    await async_unload_entry(hass, entry)
+
+
+async def test_coordinator_failed_fetch_marks_unavailable(hass, make_entry) -> None:
+    """A failed fetch (transport failure or non-2xx — both typed) raises
+    out of the refresh pass: last_update_success goes False (entities
+    unavailable), data keeps its last good value, and the typed error is
+    logged, never swallowed."""
+    error = NestQuestApiError(
+        "NestQuest API GET /api/v1/panel/snapshot failed with HTTP 503",
+        status=503,
+    )
+    # The stub serves the good snapshot for setup's first refresh, then
+    # the scripted failure.
+    client = StubSnapshotClient(FIXTURE_SNAPSHOT, error)
+    _entry, coordinator = await _wire_entry(hass, make_entry, client)
+    # First refresh (at setup) served the good snapshot.
+    assert coordinator.data is not None
+    assert coordinator.last_update_success is True
+
+    # The next pass hits the scripted failure: it raises out of the
+    # refresh, marks the entities unavailable, and keeps the last GOOD
+    # snapshot as data.
+    with pytest.raises(NestQuestApiError):
+        await coordinator.async_refresh()
+    assert coordinator.last_update_success is False
+    assert coordinator.data.children[0].child_name == "Ada"
+
+
+async def test_coordinator_unconfigured_api_does_not_crash_setup(
+    hass, make_entry, monkeypatch
 ) -> None:
-    """A child absent today carries the ISO date of their next present
+    """An entry with no panel token set up fine: the coordinator gets
-    day; an always-absent pattern carries None instead."""
+    the typed-error stub, the first refresh fails cleanly (unavailable
+    entities), and setup does NOT crash."""
+    # Restore the production factory: the conftest default would serve
+    # the local snapshot, but this test exercises the token guard.
+    import custom_components.nestquest as nq
+
+    monkeypatch.setattr(
+        nq, "coordinator_client_from_entry", coordinator_client_from_entry
+    )
     entry = wire_entry_to_registry(make_entry(), hass.registry)
     assert await async_setup_entry(hass, entry) is True
     coordinator = entry.runtime_data.coordinator
-    database = entry.runtime_data.database
+    from custom_components.nestquest.coordinator import _UnconfiguredApiClient
-    await create_child(database, "Ada")
+
-    ada = (await list_children(database))[0]
+    assert isinstance(coordinator.api_client, _UnconfiguredApiClient)
-    today = datetime.date.today()
+    # A real NestQuestApiClient was never built (it would ValueError).
-    pattern = ",".join(
+    assert not isinstance(coordinator.api_client, NestQuestApiClient)
-        str(day) for day in range(7) if day != today.weekday()
+    assert coordinator.last_update_success is False
-    )
+    assert coordinator.data is None
-    await PresenceSchedulesDao(database).upsert_by_child(
+    with pytest.raises(NestQuestApiError, match="not configured"):
-        ada.id, 1, today.isoformat(), pattern
+        await coordinator.async_refresh()
-    )
-    await create_child(database, "Bo")
-    bo = (await list_children(database))[1]
-    await PresenceSchedulesDao(database).upsert_by_child(
-        bo.id, 1, today.isoformat(), ""
-    )
-    snapshot = await coordinator._async_update_data()
-    by_name = {child.child_name: child for child in snapshot.children}
-    assert by_name["Ada"].present is False
-    assert by_name["Ada"].next_present == (
-        today + datetime.timedelta(days=1)
-    ).isoformat()
-    assert by_name["Bo"].present is False
-    assert by_name["Bo"].next_present is None
 
 
-async def test_coordinator_reflects_completion_and_uncompletion(
+async def test_coordinator_configured_token_builds_real_client(
     hass, make_entry
 ) -> None:
-    entry = wire_entry_to_registry(make_entry(), hass.registry)
+    """An entry WITH a panel token builds the real client through the
+    production factory (a stub transport injected via session_factory,
+    the mock-only harness having no aiohttp module to hand in), and the
+    coordinator's refresh polls the snapshot route end to end."""
+    import json as json_module
+
+    class _OneShotSession:
+        """A session-shaped stub answering every request with the fixture."""
+
+        def __init__(self, payload) -> None:
+            self._body = json_module.dumps(payload)
+
+        def request(self, method, url, **kwargs):
+            body = self._body
+
+            class _Response:
+                def __init__(self) -> None:
+                    self.status = 200
+
+                async def text(self):
+                    return body
+
+            class _Context:
+                async def __aenter__(self):
+                    return _Response()
+
+                async def __aexit__(self, *exc):
+                    return False
+
+            return _Context()
+
+    def _session_factory(_hass):
+        return _OneShotSession(FIXTURE_SNAPSHOT)
+
+    entry = wire_entry_to_registry(
+        make_entry(
+            data={"api_base_url": "http://api.test:8000", "panel_token": "tok"}
+        ),
+        hass.registry,
+    )
+    real_client = coordinator_client_from_entry(
+        hass, entry, session_factory=_session_factory
+    )
+    assert isinstance(real_client, NestQuestApiClient)
+
+    set_coordinator_client(entry, real_client)
     assert await async_setup_entry(hass, entry) is True
     coordinator = entry.runtime_data.coordinator
-    database = entry.runtime_data.database
+    assert isinstance(coordinator.api_client, NestQuestApiClient)
-    await _seed_day(database)
+    # The real client polls the stub transport; the snapshot lands.
-    ada = (
+    await coordinator.async_refresh()
-        await coordinator._async_update_data()
+    assert coordinator.data.children[0].child_name == "Ada"
-    ).children[0]
-    instance_id = ada.instances[0].instance_id
-
-    await complete_instance(
-        database,
-        instance_id,
-        actor_source="panel",
-        actor_child_id=ada.child_id,
-    )
-    snapshot = await coordinator._async_update_data()
-    child = snapshot.children[0]
-    assert child.completed_today == 1
-    assert child.remaining_today == 0
-    assert child.completion_pct == 100
-    view = child.instances[0]
-    assert view.state == "done"
-    assert view.completed_at is not None
-    assert view.was_on_time is not None
-
-    from custom_components.nestquest.completion import uncomplete_instance
-
-    await uncomplete_instance(
-        database, instance_id, actor_source="user", actor_user_id="admin-1"
-    )
-    snapshot = await coordinator._async_update_data()
-    child = snapshot.children[0]
-    assert child.completed_today == 0
-    assert child.remaining_today == 1
-    assert child.instances[0].state == "open"
-
-
-async def test_coordinator_zero_quests_reports_full_percentage(
-    hass, make_entry
-) -> None:
-    entry = wire_entry_to_registry(make_entry(), hass.registry)
-    assert await async_setup_entry(hass, entry) is True
-    coordinator = entry.runtime_data.coordinator
-    await create_child(entry.runtime_data.database, "Ada")
-    snapshot = await coordinator._async_update_data()
-    child = snapshot.children[0]
-    assert child.due_today == 0
-    assert child.completion_pct == 100, "zero quests is a perfect day"
-    assert child.instances == ()
-
-
-async def test_coordinator_cycle_day_from_first_scheduled_child(
-    hass, make_entry
-) -> None:
-    entry = wire_entry_to_registry(make_entry(), hass.registry)
-    assert await async_setup_entry(hass, entry) is True
-    coordinator = entry.runtime_data.coordinator
-    database = entry.runtime_data.database
-    await create_child(database, "Ada")
-    ada = (await list_children(database))[0]
-    today = datetime.date.today()
-    # A 2-week cycle anchored 3 days ago: today is day 4.
-    anchor = today - datetime.timedelta(days=3)
-    await PresenceSchedulesDao(database).upsert_by_child(
-        ada.id, 2, anchor.isoformat(), "0,1,2,3,4,5,6|"
-    )
-    snapshot = await coordinator._async_update_data()
-    assert snapshot.cycle_day == 4
-
-
-async def test_coordinator_presence_resolves_schedule_and_override(
-    hass, make_entry
-) -> None:
-    entry = wire_entry_to_registry(make_entry(), hass.registry)
-    assert await async_setup_entry(hass, entry) is True
-    coordinator = entry.runtime_data.coordinator
-    database = entry.runtime_data.database
-    await create_child(database, "Ada")
-    ada = (await list_children(database))[0]
-    today = datetime.date.today()
-    # Scheduled absent today (empty weekday set for this cycle week).
-    await PresenceSchedulesDao(database).upsert_by_child(
-        ada.id, 1, today.isoformat(), ""
-    )
-    snapshot = await coordinator._async_update_data()
-    assert snapshot.children[0].present is False
-
-    # An override beats the pattern.
-    from custom_components.nestquest.dao_presence import (
-        PresenceOverridesDao,
-    )
-
-    await PresenceOverridesDao(database).create(
-        ada.id, today.isoformat(), today.isoformat(), True
-    )
-    snapshot = await coordinator._async_update_data()
-    assert snapshot.children[0].present is True
-
-
-async def test_coordinator_next_present_honours_future_override(
-    hass, make_entry
-) -> None:
-    entry = wire_entry_to_registry(make_entry(), hass.registry)
-    assert await async_setup_entry(hass, entry) is True
-    coordinator = entry.runtime_data.coordinator
-    database = entry.runtime_data.database
-    await create_child(database, "Ada")
-    ada = (await list_children(database))[0]
-    today = datetime.date.today()
-    tomorrow = today + datetime.timedelta(days=1)
-    # Scheduled present tomorrow (single-day cycle, weekday set set below
-    # covers every day), but overridden absent tomorrow.
-    await PresenceSchedulesDao(database).upsert_by_child(
-        ada.id, 1, today.isoformat(), "0,1,2,3,4,5,6"
-    )
-    from custom_components.nestquest.dao_presence import (
-        PresenceOverridesDao,
-    )
-
-    await PresenceOverridesDao(database).create(
-        ada.id, tomorrow.isoformat(), tomorrow.isoformat(), False
-    )
-    snapshot = await coordinator._async_update_data()
-    child = snapshot.children[0]
-    assert child.present is True
-    assert child.next_present != tomorrow.isoformat(), (
-        "a future absent override must remove tomorrow from the preview"
-    )
-
-
-async def test_coordinator_derives_missed_for_past_due_open(
-    hass, make_entry
-) -> None:
-    entry = wire_entry_to_registry(make_entry(), hass.registry)
-    assert await async_setup_entry(hass, entry) is True
-    coordinator = entry.runtime_data.coordinator
-    snapshot = await coordinator._async_update_data()
-    # No children: empty but valid snapshot.
-    assert snapshot.children == ()
 
 
 async def test_setup_creates_coordinator_with_configured_interval(
@@ -270,12 +459,9 @@ async def test_setup_creates_coordinator_with_configured_interval(
     coordinator = entry.runtime_data.coordinator
     assert isinstance(coordinator, NestQuestCoordinator)
     assert coordinator.update_interval == datetime.timedelta(seconds=60)
-    assert coordinator.data is not None, "first refresh ran at setup"
 
 
-async def test_setup_defaults_to_five_minute_interval(
+async def test_setup_defaults_to_five_minute_interval(hass, make_entry) -> None:
-    hass, make_entry
-) -> None:
     entry = wire_entry_to_registry(make_entry(), hass.registry)
     assert await async_setup_entry(hass, entry) is True
     coordinator = entry.runtime_data.coordinator
@@ -298,24 +484,11 @@ async def test_unload_shuts_coordinator_down(hass, make_entry) -> None:
     assert torn_down == [coordinator]
 
 
-async def test_coordinator_notifies_listeners_on_refresh(
-    hass, make_entry
-) -> None:
-    entry = wire_entry_to_registry(make_entry(), hass.registry)
-    assert await async_setup_entry(hass, entry) is True
-    coordinator = entry.runtime_data.coordinator
-    called = []
-    coordinator.async_add_listener(lambda: called.append("entity"))
-    await coordinator.async_refresh()
-    assert called == ["entity"]
-    assert coordinator.last_update_success is True
-
-
 async def test_failed_first_refresh_shuts_coordinator_down(
     hass, make_entry, monkeypatch
 ) -> None:
     """A setup failure after coordinator creation must not leak its
-    listeners against the database the except path closes."""
+    listeners."""
     from custom_components.nestquest import async_setup_entry
     import custom_components.nestquest.coordinator as coordinator_module
 
@@ -344,3 +517,14 @@ async def test_failed_first_refresh_shuts_coordinator_down(
         await async_setup_entry(hass, entry)
     assert shutdown_calls == [entry.entry_id]
     assert getattr(entry, "runtime_data", None) is None
+
+
+async def test_snapshot_from_api_payload_empty_household() -> None:
+    """An empty household (no children) is a valid snapshot: empty
+    children tuple, cycle day passes through."""
+    snapshot = snapshot_from_api_payload(
+        {"today_iso": "2026-09-23", "cycle_day": 0, "children": []}
+    )
+    assert snapshot.children == ()
+    assert snapshot.cycle_day == 0
+    assert snapshot.today_iso == "2026-09-23"

tests/test_core_snapshot.py

@@ -123,9 +123,11 @@ async def test_build_snapshot_explicit_values(hass, make_entry, monkeypatch) ->
     database = entry.runtime_data.database
     settings = entry.runtime_data.settings
 
-    # Single clock read for the seed/snapshot anchor (no midnight skew).
+    # Single clock read for the seed/snapshot anchor (no midnight skew);
-    today = coordinator._local_now().date()
+    # the coordinator no longer owns a clock read (the API serves the
+    # snapshot), so the test resolves the HA-local zone directly.
     time_zone = ZoneInfo(hass.config.time_zone)
+    today = datetime.datetime.now(time_zone).date()
     # Pin the build instant at 12:00 local: past Ada's 10:00 due time
     # (overdue) and before Bo's 17:00, and the completion moment for Bo.
     pinned_now = datetime.datetime(
@@ -294,13 +296,38 @@ async def test_build_snapshot_explicit_values(hass, make_entry, monkeypatch) ->
         == "missed"
     )
 
-    # REQUIRED wrapper tie-in: the coordinator's _async_update_data is a
+    # REQUIRED wrapper tie-in: since Feature 18 the coordinator's
-    # thin WRAPPER over build_snapshot, so pinning its clock to the SAME
+    # refresh polls the snapshot through its API client, so pinning the
-    # pinned_now the builder was called with must reproduce the builder's
+    # client to serve the payload of the SAME snapshot built with
-    # snapshot byte-for-byte.  The dataclasses are frozen, so == is a full
+    # pinned_now must reproduce the builder's snapshot byte-for-byte.
-    # deep compare — a wrapper that mis-passed today vs now, or stopped
+    # The dataclasses are frozen, so == is a full deep compare — a
-    # calling the builder, would diverge here even though the literal
+    # reconstruction that dropped or reshaped a field would diverge
-    # assertions above still pass.
+    # here even though the literal assertions above still pass.
-    monkeypatch.setattr(coordinator, "_local_now", lambda: pinned_now)
+    from conftest import set_coordinator_client
+
+    class _PinnedPayloadClient:
+        async def get_snapshot(self):
+            return {
+                "today_iso": built.today_iso,
+                "cycle_day": built.cycle_day,
+                "children": [
+                    {
+                        "child_id": child.child_id,
+                        "child_name": child.child_name,
+                        "present": child.present,
+                        "next_present": child.next_present,
+                        "due_today": child.due_today,
+                        "completed_today": child.completed_today,
+                        "remaining_today": child.remaining_today,
+                        "completion_pct": child.completion_pct,
+                        "instances": instance_payload(
+                            child.instances, include_missed=False
+                        ),
+                    }
+                    for child in built.children
+                ],
+            }
+
+    set_coordinator_client(entry, _PinnedPayloadClient())
     await coordinator.async_refresh()
     assert coordinator.data == built

tests/test_entity_matrix.py

@@ -180,9 +180,12 @@ async def test_entity_and_event_matrix(hass, make_entry) -> None:
     assert _sensor(hass, ada.id, "all_done").is_on is False
     assert _sensor(hass, ada.id, "quests_remaining_today").native_value == 1
 
-    # --- The instances payload omits missed instances while
+    # --- The instances payload omits missed instances (D-009) — and
-    # admin_instances includes them (D-009): pin the derive clock
+    # since Feature 18 the snapshot comes from the API panel route,
-    # forward in the TEST ONLY so today's open instances read missed.
+    # which omits missed rows ENTIRELY, so admin_instances cannot
+    # carry them either (the admin surface for missed quests is the
+    # PWA, reading the API directly): pin the derive clock forward in
+    # the TEST ONLY so today's open instances read missed.
     original_refresh = coordinator._async_update_data
 
     async def _future_dated_refresh():
@@ -203,9 +206,9 @@ async def test_entity_and_event_matrix(hass, make_entry) -> None:
     await coordinator.async_refresh()
     attributes = _sensor(hass, bo.id, "quests_due_today").extra_state_attributes
     assert attributes["instances"] == [], "panel payload omits missed"
-    assert len(attributes["admin_instances"]) == 2
+    assert attributes["admin_instances"] == [], (
-    assert all(
+        "the API payload omits missed rows, so the admin payload "
-        entry["state"] == "missed" for entry in attributes["admin_instances"]
+        "carries none either (the PWA is the admin surface now)"
     )
     coordinator._async_update_data = original_refresh
     await coordinator.async_refresh()

tests/test_sensors.py

@@ -221,19 +221,23 @@ async def test_due_today_attributes_carry_the_panel_payload(
     assert bo_instance["on_time"] is None
 
 
-async def test_due_today_payload_omits_missed_for_panel_includes_for_admin(
+async def test_due_today_payload_omits_missed_admin_equals_panel(
     hass, make_entry, monkeypatch
 ) -> None:
-    """D-009: the panel payload omits missed instances, the admin one keeps them.
+    """D-009: the panel payload omits missed instances.
 
-    A missed instance is derived (``due_date`` before the snapshot's
+    Since Feature 18 the snapshot comes from the API panel route,
-    "today"), never stored.  The coordinator's day listing is keyed on
+    which omits missed rows entirely (the admin surface for missed
-    ``_local_now``'s date, so pinning the clock forward would move the
+    quests is the PWA, reading the API directly).  The entity payload
-    listing window off today's rows entirely; the pinned FUTURE clock
+    therefore cannot carry missed rows any more: ``admin_instances``
-    is therefore applied at the ``derive_state`` boundary instead —
+    equals ``instances`` — open and completed rows only.  A missed
-    today's open instances then read as missed through the same
+    instance is still derived locally (``due_date`` before the
-    derivation rule, without back-dating instance rows past the DAO's
+    snapshot's "today"); the pinned-FUTURE clock at the
-    no-past guard or touching append-only completion events.
+    ``derive_state`` boundary makes today's open instances read
+    missed through the same derivation rule, and this test pins the
+    change: neither payload carries them, and the count rollups
+    (precomputed server-side from the full day) are unaffected here
+    because the API counts arrive per the route's own build.
     """
     entry, coordinator, (ada, bo, cory) = await _setup_seeded_entry(
         hass, make_entry
@@ -256,12 +260,10 @@ async def test_due_today_payload_omits_missed_for_panel_includes_for_admin(
     assert attributes["instances"] == [], (
         "missed instances are omitted from the panel payload"
     )
-    [missed] = attributes["admin_instances"]
+    assert attributes["admin_instances"] == [], (
-    assert missed["state"] == "missed"
+        "the API payload omits missed rows, so the admin payload "
-    assert missed["completed_at"] is None
+        "carries none either (the PWA is the admin surface now)"
-    # Counts still roll the missed instance up as not-completed.
+    )
-    assert _sensor(hass, bo.id, "quests_completed_today").native_value == 0
-    assert _sensor(hass, bo.id, "quests_remaining_today").native_value == 1
 
 
 @pytest.mark.parametrize("kind", SENSOR_KINDS)