Panel plane: complete route (idempotent)

POST /api/v1/panel/instances/{id}/complete delegates to the core
completion layer (nestquest_core.completion.complete_instance) with
actor_source='panel' and the tapped actor_child_id, so the append
lock, actor validation, and idempotence all live in core. The route
maps only the unknown-instance ValueError to 404, guards the
child-mismatch case (complete_instance does not check that the tapped
profile owns the instance) with a 404 that does not leak existence,
and returns success on both the first call and the already-done
no-op — the CompletionResult.appended flag decides, so a retried tap
never writes a second event. The router's single require_panel_token
dependency covers auth; tests cover first call, idempotent repeat,
404, 401, wrong-child 404, and OpenAPI documentation.

Task: 1860ef76-e936-4d4f-a150-1cf7b721f519

api/__init__.py

@@ -0,0 +1,19 @@
+"""NestQuest API service.
+
+A standalone FastAPI deployable that owns the NestQuest database and
+exposes it over HTTP to the Home Assistant integration (panel plane) and
+the admin PWA (admin plane).  See Feature 16 (task cd03735b) in the
+project tracker for the full contract.
+
+This package imports the NestQuest domain ``core`` WITHOUT executing
+``custom_components/nestquest/__init__.py`` — that parent package's
+``__init__.py`` imports ``homeassistant``, which is absent from the
+API's runtime.  The coupling is encapsulated in
+:mod:`api.nestquest_core`, which loads ``core`` by file location with
+:mod:`importlib.util` and registers it under the distinct top-level name
+``nestquest_core`` (no ``sys.path`` mutation, no generic top-level
+names published).  It is a TRANSITIONAL coupling that Feature 18 will
+revisit: once the integration becomes a thin API client and ``core``
+moves out of the integration bundle, this helper goes away.
+"""
+from __future__ import annotations

api/app.py

@@ -0,0 +1,110 @@
+"""The NestQuest FastAPI application.
+
+This module builds the ASGI app for the NestQuest API service (Feature
+16).  The skeleton here wires the bundled ``core`` (Feature 15) and
+exposes the two endpoints every later task depends on:
+
+- ``GET /health`` — returns ``200`` with a JSON status body once the
+  app has imported core, opened the database, and applied migrations;
+  a cheap ``SELECT 1`` confirms the connection is live without leaking
+  the filesystem path on an unauthenticated route.
+- ``GET /api/v1/panel/snapshot`` — the panel plane's today snapshot
+  (service-token protected; see :mod:`api.routes_panel`, whose router
+  carries the shared :func:`api.dependencies.require_panel_token`
+  check).
+- ``GET /docs`` — FastAPI's auto-served OpenAPI document (Swagger UI);
+  ``/openapi.json`` is the raw schema.  No extra wiring is needed;
+  FastAPI serves both by default.
+
+The database is opened and migrated in a FastAPI lifespan context so a
+startup failure (e.g. an unwritable path) surfaces as a startup error
+rather than the first request.  The connection is closed on shutdown.
+
+This module exports ONLY the :func:`create_app` factory — there is no
+module-level app instance, because building one at import time would
+read ``NESTQUEST_DB_PATH`` at import (and fail-fast on a missing value)
+before any worker is ready to report it.  Serve with::
+
+    uvicorn --factory api.app:create_app
+
+so the factory runs on each worker startup and reads the environment
+then.
+"""
+from __future__ import annotations
+
+from contextlib import asynccontextmanager
+from collections.abc import AsyncIterator
+
+from fastapi import FastAPI
+
+from api.config import ApiConfig
+from api.database import DatabaseState, make_database
+from api.routes_panel import router as panel_router
+
+
+def _build_lifespan(db_path: str):
+    """Return a lifespan that opens+migrates then closes one database.
+
+    Captured as a closure so the app factory can hand the configured
+    path in without threading it through FastAPI's lifespan signature.
+    """
+
+    @asynccontextmanager
+    async def lifespan(app: FastAPI) -> AsyncIterator[None]:
+        state = make_database(db_path)
+        app.state.db = state
+        try:
+            await state.open_and_migrate()
+            yield
+        finally:
+            await state.close()
+
+    return lifespan
+
+
+def create_app(config: ApiConfig | None = None) -> FastAPI:
+    """Build the NestQuest API FastAPI app.
+
+    ``config`` defaults to one built from the process environment, so
+    ``uvicorn --factory api.app:create_app`` picks up
+    ``NESTQUEST_DB_PATH`` (and fails fast on startup if it is missing).
+    Tests pass an explicit config so each test gets a hermetic temp
+    SQLite file.
+    """
+    cfg = config if config is not None else ApiConfig.from_env()
+
+    app = FastAPI(
+        title="NestQuest API",
+        description=(
+            "Standalone HTTP service that owns the NestQuest database and "
+            "exposes it to the Home Assistant integration (panel plane) and "
+            "the admin PWA (admin plane)."
+        ),
+        version="0.1.0",
+        lifespan=_build_lifespan(cfg.db_path),
+    )
+
+    # The resolved config rides on app.state so the reusable route
+    # dependencies (the panel service-token check) read the configured
+    # values from the app rather than module state.
+    app.state.config = cfg
+    app.include_router(panel_router)
+
+    @app.get("/health", summary="Service health")
+    async def health() -> dict[str, str]:
+        """Return service health.
+
+        Returns ``200`` with ``{"status": "ok"}`` once the lifespan has
+        opened and migrated the database.  A cheap ``SELECT 1`` against
+        the live connection confirms the database is reachable WITHOUT
+        leaking the filesystem path on an unauthenticated route; if the
+        connection is dead the query raises and the probe fails.
+        """
+        state: DatabaseState = app.state.db
+        await state.database.fetch_one("SELECT 1")
+        return {"status": "ok"}
+
+    return app
+
+
+__all__ = ["create_app"]

api/config.py

@@ -0,0 +1,98 @@
+"""Configuration for the NestQuest API service.
+
+The API reads its configuration knobs from environment variables:
+
+- ``NESTQUEST_DB_PATH`` — the SQLite database file.  The API opens this
+  file on startup (creating it if absent) and applies migrations.
+- ``NESTQUEST_PANEL_TOKEN`` — the static panel-plane service token
+  (D-012): the credential ``/api/v1/panel/*`` routes require via
+  :func:`api.dependencies.require_panel_token`.  It is stored outside
+  the repo and handed to the service through the environment.
+
+Unlike a dev convenience default, a missing or empty value is a
+configuration ERROR, not a silent fallback: a default database path
+would silently drop data at reboot, and a default (or empty) service
+token would either authenticate everyone or lock the panel plane out
+for good.  ``ApiConfig.from_env`` therefore RAISES when either variable
+is unset or empty.  This mirrors the integration's "explicit settings
+object" discipline (Feature 15's ``core.settings``): the API never
+reads HA config; callers pass the resolved values into the wiring.
+
+Serving: the app is built with the factory ``api.app:create_app`` — run
+it with ``uvicorn --factory api.app:create_app`` so the factory reads
+the environment on each worker startup rather than at import time.
+"""
+from __future__ import annotations
+
+import os
+from dataclasses import dataclass
+
+#: Environment variable holding the SQLite file path.  The API opens
+#: this file on startup (creating it if absent) and applies migrations.
+#: REQUIRED — unset or empty raises :class:`ConfigError` from
+#: :meth:`ApiConfig.from_env`.
+DB_PATH_ENV = "NESTQUEST_DB_PATH"
+
+#: Environment variable holding the static panel-plane service token
+#: (D-012), checked by :func:`api.dependencies.require_panel_token`.
+#: REQUIRED — unset or empty raises :class:`ConfigError` from
+#: :meth:`ApiConfig.from_env`; there is no silent default, because an
+#: empty configured token would either authenticate every caller or
+#: lock the panel plane out permanently.
+PANEL_TOKEN_ENV = "NESTQUEST_PANEL_TOKEN"
+
+
+class ConfigError(RuntimeError):
+    """Raised when required API configuration is missing or invalid."""
+
+
+@dataclass(frozen=True)
+class ApiConfig:
+    """Resolved API configuration.
+
+    Both fields are required (no defaults): ``from_env`` rejects an
+    unset or empty value for either, and a caller building the dataclass
+    directly must pass an explicit token — the token check itself fails
+    closed on an empty configured token, but expecting a caller to
+    discover that at request time is a wiring mistake, so the field is
+    mandatory.  Kept as a dataclass so later tasks (admin plane, SSE,
+    settings persistence) can extend it without touching the call sites
+    that read ``db_path``.
+    """
+
+    db_path: str
+    panel_token: str
+
+    @classmethod
+    def from_env(cls, env: dict[str, str] | None = None) -> "ApiConfig":
+        """Build configuration from the process environment.
+
+        ``env`` defaults to ``os.environ``; tests pass an explicit dict
+        so they are hermetic (no monkeypatch of the global environ).
+
+        Raises :class:`ConfigError` when ``NESTQUEST_DB_PATH`` is unset
+        or empty/whitespace-only — there is no silent default, because a
+        default in the temp directory would silently lose data at reboot
+        — and likewise when ``NESTQUEST_PANEL_TOKEN`` is unset or empty
+        (a default token is never invented: the panel plane is closed
+        until a real one is configured).
+        """
+        source = env if env is not None else os.environ
+        raw_db_path = source.get(DB_PATH_ENV, "").strip()
+        if not raw_db_path:
+            raise ConfigError(
+                f"{DB_PATH_ENV} must be set to a writable SQLite file path "
+                f"(it is unset or empty — the API will not fall back to a "
+                f"temp directory and silently lose data)"
+            )
+        raw_panel_token = source.get(PANEL_TOKEN_ENV, "").strip()
+        if not raw_panel_token:
+            raise ConfigError(
+                f"{PANEL_TOKEN_ENV} must be set to the panel service token "
+                f"(it is unset or empty — the API will not start without "
+                f"one, and no default token is invented)"
+            )
+        return cls(db_path=raw_db_path, panel_token=raw_panel_token)
+
+
+__all__ = ["ApiConfig", "ConfigError", "DB_PATH_ENV", "PANEL_TOKEN_ENV"]

api/database.py

@@ -0,0 +1,82 @@
+"""Database wiring for the NestQuest API service.
+
+The API owns the database (it is the writer of record per Feature 16's
+contract).  This module owns one application-lifetime
+:class:`core.db.NestQuestDatabase`: it opens the SQLite file at the
+configured path on startup, applies migrations (creating the schema on
+a fresh file), and closes the connection on shutdown.
+
+The executor callable passed into ``NestQuestDatabase`` mirrors the
+contract of ``hass.async_add_executor_job``: schedule a synchronous
+callable on a worker and await its result.  HA's own version lives on
+the event loop; the API is not HA, so it uses
+:func:`asyncio.to_thread` for the same effect — sqlite3 calls run on a
+worker thread and only plain data returns to the event loop.
+"""
+from __future__ import annotations
+
+import asyncio
+import logging
+from typing import Any
+
+from api.nestquest_core import core_db, core_migrations
+
+LOGGER = logging.getLogger(__name__)
+
+#: The async SQLite wrapper.  Re-exported so route handlers and later
+#: tasks reach it through the API package, not the bundled core.
+NestQuestDatabase = core_db.NestQuestDatabase
+
+#: The migration runner.  Re-exported for the same reason.
+apply_migrations = core_migrations.apply_migrations
+
+
+async def _executor(fn: Any, *args: Any, **kwargs: Any) -> Any:
+    """Run a synchronous callable on a worker thread and await its result.
+
+    Mirrors the contract of ``hass.async_add_executor_job`` so the
+    bundled ``NestQuestDatabase`` (written against that contract) works
+    unchanged in the API process: sqlite3 calls never block the event
+    loop, and only plain Python data (row tuples,
+    :class:`core.db.ExecutionResult`) crosses back.
+    """
+    return await asyncio.to_thread(fn, *args, **kwargs)
+
+
+class DatabaseState:
+    """Holds the live database wrapper and its resolved path.
+
+    A small container so the lifespan and the route handlers share one
+    authoritative reference; FastAPI's lifespan stores one of these on
+    ``app.state.db`` and the health route reads it back.
+    """
+
+    __slots__ = ("database", "db_path")
+
+    def __init__(self, database: NestQuestDatabase, db_path: str) -> None:
+        self.database = database
+        self.db_path = db_path
+
+    async def open_and_migrate(self) -> None:
+        """Open the connection and apply migrations to the latest version."""
+        LOGGER.info("Opening NestQuest database at %s", self.db_path)
+        await self.database.open(self.db_path)
+        version = await apply_migrations(self.database)
+        LOGGER.info("NestQuest schema at version %d", version)
+
+    async def close(self) -> None:
+        """Close the connection; safe to call even if open failed."""
+        await self.database.close()
+
+
+def make_database(db_path: str) -> DatabaseState:
+    """Construct a :class:`DatabaseState` for the given path (not yet open)."""
+    return DatabaseState(NestQuestDatabase(_executor), db_path)
+
+
+__all__ = [
+    "DatabaseState",
+    "NestQuestDatabase",
+    "apply_migrations",
+    "make_database",
+]

api/dependencies.py

@@ -0,0 +1,81 @@
+"""Reusable FastAPI dependencies for the NestQuest API routes.
+
+The panel plane (``/api/v1/panel/*``) is authenticated by the static
+service token configured through ``NESTQUEST_PANEL_TOKEN`` (D-012): the
+HA integration presents it as a Bearer credential on every panel
+request.  :func:`require_panel_token` is the ONE implementation of that
+check — every panel route (this task's snapshot route and each later
+panel route) declares it as a dependency rather than re-implementing
+token handling, so the credential, the failure behaviour, and the
+401 contract stay in exactly one place.
+
+The dependency FAILS CLOSED: a missing ``Authorization`` header, a
+malformed one (wrong scheme or empty credential), a token that does not
+match the configured value, and an empty configured token all yield
+HTTP 401.  The comparison is constant-time (:func:`secrets.compare_digest`)
+so the wall-clock difference between "wrong length" and "wrong value"
+cannot be used to probe the token byte by byte, and every rejection
+carries the same detail — nothing in the response distinguishes which
+part of the check failed.
+"""
+from __future__ import annotations
+
+import secrets
+from typing import Annotated
+
+from fastapi import Header, HTTPException, Request
+
+#: The authorization scheme the panel plane expects.  Matched
+#: case-insensitively, as RFC 9110 requires for scheme names.
+_BEARER_SCHEME = "bearer"
+
+#: The 401 detail shared by every rejection — deliberately uniform so
+#: the response never reveals which part of the check failed.
+_REJECTION_DETAIL = "Missing or invalid panel service token"
+
+#: Challenge header returned with a 401, per the Bearer auth scheme.
+_WWW_AUTHENTICATE = {"WWW-Authenticate": "Bearer"}
+
+
+def _reject() -> HTTPException:
+    """Build the single 401 the dependency raises for every failure."""
+    return HTTPException(
+        status_code=401,
+        detail=_REJECTION_DETAIL,
+        headers=_WWW_AUTHENTICATE,
+    )
+
+
+async def require_panel_token(
+    request: Request,
+    authorization: Annotated[str | None, Header()] = None,
+) -> None:
+    """Reject the request with 401 unless it carries the panel token.
+
+    Reads the configured token off ``app.state.config`` (set by
+    :func:`api.app.create_app`) so the dependency stays reusable across
+    routes and carries no module state of its own.  A missing or
+    malformed ``Authorization`` header, a non-matching credential, and
+    an EMPTY configured token (a wiring mistake) all raise the same
+    ``HTTPException(401)`` — the check is closed even when the service
+    is misconfigured.
+
+    Returns ``None`` on success; FastAPI discards a ``None`` return,
+    the route handler simply proceeds.
+    """
+    config = getattr(request.app.state, "config", None)
+    expected = config.panel_token if config is not None else ""
+    if not expected or authorization is None:
+        raise _reject()
+    scheme, _, credential = authorization.partition(" ")
+    if scheme.lower() != _BEARER_SCHEME or not credential.strip():
+        raise _reject()
+    # compare_digest on bytes so a non-ASCII token raises nothing and a
+    # timing side channel on the str path is not available.
+    if not secrets.compare_digest(
+        credential.strip().encode("utf-8"), expected.encode("utf-8")
+    ):
+        raise _reject()
+
+
+__all__ = ["require_panel_token"]

api/nestquest_core.py

@@ -0,0 +1,130 @@
+"""Transitional coupling: import ``core`` without importing Home Assistant.
+
+The NestQuest domain ``core`` package (Feature 15) is bundled INSIDE the
+Home Assistant integration at ``custom_components/nestquest/core/``.
+Importing it the obvious way — ``import custom_components.nestquest.core``
+— would execute ``custom_components/nestquest/__init__.py``, which
+imports ``homeassistant``.  Home Assistant is NOT installed in the API
+service's runtime, so that import raises ``ModuleNotFoundError`` and the
+API cannot start.
+
+``core`` itself is a clean, Home-Assistant-free package: its
+``__init__.py`` is a bare docstring and every internal import is
+relative (``from .db import ...``).  It can therefore be imported by
+file location as a standalone package.
+
+This module loads ``core`` with :func:`importlib.util.spec_from_file_location`
+— registering it under the distinct top-level name ``nestquest_core``
+with ``submodule_search_locations`` set to the bundled ``core``
+directory — so its relative imports resolve against that directory
+without touching ``sys.path``.  No generic top-level name (``db``,
+``const``, ``schema``, ...) is published, so nothing here can silently
+shadow a future dependency, and the integration's HA-coupled
+``__init__.py`` is never executed: ``custom_components.nestquest`` is
+never imported.
+
+Usage::
+
+    from api.nestquest_core import core_db, core_migrations
+    # core_db.NestQuestDatabase, core_migrations.apply_migrations, ...
+
+This is a TRANSITIONAL coupling.  Feature 18 (task 430f7f98) converts
+the integration into a thin API client and moves ``core`` out of the
+integration bundle; once that lands, this bootstrap helper goes away and
+the API imports ``core`` as an ordinary installed dependency.
+
+NOTE on the pytest process: the suite's ``conftest.py`` stubs the
+parent integration package and imports ``custom_components.nestquest.core.*``
+BEFORE any API test runs, so two copies of the core package coexist in
+the pytest process — the one registered here as ``nestquest_core.*``
+(loaded by file location) and the conftest-stubbed
+``custom_components.nestquest.core.*``.  Later tasks must NOT compare
+class or exception identity across these two copies: a
+``nestquest_core.db.NestQuestDatabase`` is a DIFFERENT class object from
+``custom_components.nestquest.core.db.NestQuestDatabase`` even though
+they share source.  Operate on a single copy within any one code path.
+"""
+from __future__ import annotations
+
+import importlib
+import importlib.util
+import sys
+from pathlib import Path
+from types import ModuleType
+
+#: The repository root (this file is ``<root>/api/nestquest_core.py``).
+_REPO_ROOT: Path = Path(__file__).resolve().parent.parent
+
+#: The bundled ``core`` package directory, inside the HA integration.
+_CORE_DIR: Path = _REPO_ROOT / "custom_components" / "nestquest" / "core"
+
+#: The ``core`` package's ``__init__.py`` — a bare docstring, so loading
+#: it by file location executes no imports of its own.
+_CORE_INIT: Path = _CORE_DIR / "__init__.py"
+
+#: The distinct top-level name under which the bundled ``core`` package
+#: is registered in ``sys.modules``.  A distinctive name (rather than the
+#: generic ``core``) avoids publishing shadow-able top-level names and
+#: keeps the bundled copy separate from the conftest-stubbed
+#: ``custom_components.nestquest.core`` present in the pytest process.
+_CORE_MODULE_NAME = "nestquest_core"
+
+
+def _load_core() -> ModuleType:
+    """Load the bundled ``core`` package by file location and return it.
+
+    Registers the package under :data:`_CORE_MODULE_NAME` in
+    ``sys.modules`` with ``submodule_search_locations`` pointing at the
+    bundled directory, so its relative imports (``from .db import ...``)
+    resolve to ``nestquest_core.<submodule>`` against that directory
+    without mutating ``sys.path``.  Idempotent: a second call returns
+    the already-registered module.
+    """
+    existing = sys.modules.get(_CORE_MODULE_NAME)
+    if existing is not None:
+        return existing
+    spec = importlib.util.spec_from_file_location(
+        _CORE_MODULE_NAME,
+        _CORE_INIT,
+        submodule_search_locations=[str(_CORE_DIR)],
+    )
+    if spec is None or spec.loader is None:
+        raise ImportError(f"could not load core from {_CORE_INIT}")
+    module = importlib.util.module_from_spec(spec)
+    sys.modules[_CORE_MODULE_NAME] = module
+    spec.loader.exec_module(module)
+    return module
+
+
+#: The bundled core package, loaded by file location and registered as
+#: ``nestquest_core`` in ``sys.modules``.  Held here so callers import the
+#: submodules through it (``nestquest_core.db``, ``nestquest_core.migrations``)
+#: the same relative way the integration does.
+core: ModuleType = _load_core()
+
+#: Re-exported for convenience; route handlers import these names from
+#: here rather than reaching into the core package directly.
+core_db = importlib.import_module(f"{_CORE_MODULE_NAME}.db")
+core_migrations = importlib.import_module(f"{_CORE_MODULE_NAME}.migrations")
+
+#: The panel snapshot builder and its payload shaper
+#: (``core.snapshot.build_snapshot`` / ``instance_payload``) — the pure
+#: assembly the panel routes call.
+core_snapshot = importlib.import_module(f"{_CORE_MODULE_NAME}.snapshot")
+
+#: The completion service (``core.completion.complete_instance`` /
+#: ``uncomplete_instance``) the panel's write routes call.
+core_completion = importlib.import_module(f"{_CORE_MODULE_NAME}.completion")
+
+#: The explicit settings object (``core.settings.NestQuestSettings``)
+#: the snapshot builder's ``settings`` parameter takes.
+core_settings = importlib.import_module(f"{_CORE_MODULE_NAME}.settings")
+
+__all__ = [
+    "core",
+    "core_completion",
+    "core_db",
+    "core_migrations",
+    "core_snapshot",
+    "core_settings",
+]

api/routes_panel.py

@@ -0,0 +1,305 @@
+"""Panel-plane routes for the NestQuest API service.
+
+The panel plane (``/api/v1/panel/*``, D-012) serves the wall panel's
+reads.  Every route on :data:`router` requires the panel service token
+through the ONE reusable dependency :func:`api.dependencies.require_panel_token`
+(declared once at the router level, so each later panel route added to
+this router inherits the check).
+
+The snapshot route is a thin adapter over the bundled core: it performs
+NO business logic.  It reads the live database off ``app.state.db``,
+resolves ONE timezone-aware ``now`` (the API host's local time — the
+API is the household's "local" host now that the domain no longer lives
+inside Home Assistant), calls the pure
+:func:`nestquest_core.snapshot.build_snapshot`, shapes each child's
+instances through :func:`nestquest_core.snapshot.instance_payload` with
+``include_missed=False`` (D-009: missed instances are OMITTED from the
+panel payload), and returns the documented JSON shape:
+
+.. code-block:: json
+
+    {
+      "today_iso": "2026-09-22",
+      "cycle_day": 2,
+      "children": [
+        {
+          "child_id": 1,
+          "child_name": "Ada",
+          "present": false,
+          "next_present": "2026-09-24",
+          "due_today": 1,
+          "completed_today": 0,
+          "remaining_today": 1,
+          "completion_pct": 0,
+          "instances": [
+            {"id": 7, "definition_id": 3, "child_id": 1,
+             "title": "Pack bag", "icon": null, "window": "morning",
+             "due_time": "10:00", "state": "open", "overdue": true,
+             "completed_at": null, "on_time": null}
+          ]
+        }
+      ]
+    }
+
+``children`` follows the household's sort order (the core builder lists
+active children ``ORDER BY sort_order, id``); ``state`` is the
+documented panel spelling ``open`` | ``completed`` (§1 of
+design/ENTITIES-AND-SERVICES.md); ``cycle_day`` is today's 1-based day
+in the first scheduled child's custody cycle (0 when no child has one).
+The same :class:`PanelSnapshotResponse` Pydantic model is the route's
+``response_model``, so the OpenAPI document carries the shape too.
+"""
+from __future__ import annotations
+
+import datetime
+import importlib
+
+from fastapi import APIRouter, Depends, HTTPException, Request
+from pydantic import BaseModel, field_validator
+
+from api.database import DatabaseState
+from api.dependencies import require_panel_token
+from api.nestquest_core import (
+    core_completion,
+    core_settings,
+    core_snapshot,
+)
+
+#: The instance DAO, imported on the app's core copy for the
+#: child-mismatch guard on the complete route.
+_dao_instances = importlib.import_module("nestquest_core.dao_instances")
+
+#: All panel-plane routes share this router; the service-token check is
+#: attached HERE so every panel route (current and later) requires it.
+router = APIRouter(
+    prefix="/api/v1/panel",
+    dependencies=[Depends(require_panel_token)],
+)
+
+
+class PanelInstancePayload(BaseModel):
+    """One instance in the documented panel payload shape (§1).
+
+    Mirrors :func:`nestquest_core.snapshot.instance_payload`:
+    ``state`` is ``open`` | ``completed`` (missed instances never reach
+    the panel payload), ``on_time`` passes the completion event's flag
+    through verbatim (``None`` for an open instance), and
+    ``completed_at`` is the event's UTC timestamp when completed.
+    """
+
+    id: int
+    definition_id: int
+    child_id: int
+    title: str
+    icon: str | None
+    window: str
+    due_time: str | None
+    state: str
+    overdue: bool
+    completed_at: str | None
+    on_time: bool | None
+
+
+class PanelChildPayload(BaseModel):
+    """One child's day: presence, rollup counts, and today's instances."""
+
+    child_id: int
+    child_name: str
+    present: bool
+    #: ISO date of the child's next present day while they are away
+    #: (the away plate renders ``Returns <weekday>, <Mon D>`` from it);
+    #: ``None`` when the child is present today.
+    next_present: str | None
+    due_today: int
+    completed_today: int
+    remaining_today: int
+    completion_pct: int
+    instances: list[PanelInstancePayload]
+
+
+class PanelSnapshotResponse(BaseModel):
+    """The whole household snapshot the panel renders from.
+
+    ``today_iso`` anchors the payload's day; ``cycle_day`` is today's
+    1-based day in the first scheduled child's custody cycle (0 when no
+    child has a schedule); ``children`` is in the household's sort
+    order.
+    """
+
+    today_iso: str
+    cycle_day: int
+    children: list[PanelChildPayload]
+
+
+class PanelCompleteRequest(BaseModel):
+    """The body of ``POST /api/v1/panel/instances/{id}/complete``.
+
+    Matches the panel's ``nestquest.complete_quest`` payload (§2 of
+    design/ENTITIES-AND-SERVICES.md): ``actor_child_id`` is the tapped
+    profile.  A positive integer is required — the core completion
+    layer rejects non-int (and bool) ids anyway, but rejecting them
+    here with 422 keeps the contract visible in the OpenAPI document
+    and fails before any database work.
+    """
+
+    actor_child_id: int
+
+    model_config = {
+        "json_schema_extra": {
+            "description": (
+                "The tapped child profile the completion is "
+                "attributed to (decision 9)."
+            )
+        }
+    }
+
+    @field_validator("actor_child_id")
+    @classmethod
+    def _positive(cls, value: int) -> int:
+        """Reject zero and negative ids with a validation error."""
+        if value < 1:
+            raise ValueError("actor_child_id must be a positive integer")
+        return value
+
+
+def _local_now() -> datetime.datetime:
+    """Return the API host's local time as ONE timezone-aware clock read.
+
+    ``now().astimezone()`` attaches the host's local timezone to a
+    single clock read, so the calendar date and wall-clock time the
+    builder derives can never disagree.  Kept as a module function (not
+    inlined) so tests pin the instant the same way the coordinator's
+    ``_local_now`` is pinned.
+    """
+    return datetime.datetime.now().astimezone()
+
+
+@router.get(
+    "/snapshot",
+    summary="Today's household snapshot",
+    response_model=PanelSnapshotResponse,
+)
+async def panel_snapshot(request: Request) -> PanelSnapshotResponse:
+    """Return today's full household snapshot for the panel.
+
+    Requires the panel service token (checked by the router's shared
+    :func:`~api.dependencies.require_panel_token` dependency).  Builds
+    the snapshot through the pure core builder against the live
+    database and shapes each child's instances with
+    ``instance_payload(include_missed=False)`` — missed instances are
+    OMITTED from the panel payload (D-009) — then returns the shape
+    documented in this module's docstring and
+    :class:`PanelSnapshotResponse`.
+    """
+    state: DatabaseState = request.app.state.db
+    snapshot = await core_snapshot.build_snapshot(
+        state.database, core_settings.NestQuestSettings(), _local_now()
+    )
+    return PanelSnapshotResponse(
+        today_iso=snapshot.today_iso,
+        cycle_day=snapshot.cycle_day,
+        children=[
+            PanelChildPayload(
+                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=[
+                    PanelInstancePayload.model_validate(instance)
+                    for instance in core_snapshot.instance_payload(
+                        child.instances, include_missed=False
+                    )
+                ],
+            )
+            for child in snapshot.children
+        ],
+    )
+
+
+@router.post(
+    "/instances/{instance_id}/complete",
+    summary="Complete one quest instance",
+    status_code=200,
+)
+async def panel_complete_instance(
+    instance_id: int, body: PanelCompleteRequest, request: Request
+) -> dict[str, str]:
+    """Complete one quest instance as the tapped child profile.
+
+    Requires the panel service token (checked by the router's shared
+    :func:`~api.dependencies.require_panel_token` dependency — the ONE
+    token check; this handler performs NO auth of its own).
+
+    Thin adapter only: resolves the live database off ``app.state.db``,
+    reads ONE timezone-aware clock (:func:`_local_now`), and delegates
+    to :func:`nestquest_core.completion.complete_instance` with
+    ``actor_source="panel"`` and the tapped ``actor_child_id`` — the
+    append/idempotence logic, the lock, and the actor-shape validation
+    all live in the core layer, never here.
+
+    Response and idempotence: ``complete_instance`` returns a
+    :class:`~nestquest_core.completion.CompletionResult` whose
+    ``appended`` flag reports whether THIS call wrote an event; a
+    repeat call for an already-completed instance is a no-op inside
+    the core layer (no duplicate event) and this route still answers
+    ``{"status": "done"}`` either way, so a retried panel tap succeeds.
+
+    Error mapping (deliberately narrow): the ONLY ``ValueError`` mapped
+    to 404 is the unknown-``instance_id`` one, identified by the
+    ``instance_id:`` prefix ``complete_instance`` names the failing
+    field with.  Every other ``ValueError`` (an invalid actor shape,
+    which the body model and the panel actor contract already make
+    unreachable) re-raises to the framework's 500 — nothing else is
+    turned into a 404 or a 500 of our own making.
+
+    Child mismatch: ``complete_instance`` verifies the tapped
+    ``actor_child_id`` exists but does NOT check it is the child the
+    instance belongs to.  The route performs that check here (one
+    ``QuestInstancesDao.get_by_id`` read) and answers 404 when the
+    instance's ``child_id`` differs — completing another child's quest
+    from the wrong profile must not succeed, and 404 (not 403) keeps
+    the instance's existence from leaking to a wrong-profile tap.
+    """
+    state: DatabaseState = request.app.state.db
+    database = state.database
+
+    # Child-mismatch guard (see docstring): the instance must belong to
+    # the tapped profile before the completion layer is entered.
+    instance = await _dao_instances.QuestInstancesDao(database).get_by_id(
+        instance_id
+    )
+    if instance is not None and instance.child_id != body.actor_child_id:
+        raise HTTPException(
+            status_code=404,
+            detail="Quest instance not found for this child",
+        )
+
+    try:
+        result = await core_completion.complete_instance(
+            database,
+            instance_id,
+            actor_source="panel",
+            actor_child_id=body.actor_child_id,
+            now=_local_now(),
+        )
+    except ValueError as error:
+        message = str(error)
+        if message.startswith("instance_id:"):
+            # complete_instance names the field in its ValueError:
+            # "instance_id: quest instance N does not exist".
+            raise HTTPException(
+                status_code=404,
+                detail="Quest instance not found",
+            ) from error
+        raise
+    # The derived state is "done" in both the appended and no-op cases;
+    # ``result.appended`` distinguishes them for callers that care —
+    # the panel route returns the same success either way.
+    return {"status": str(result)}
+
+
+__all__ = ["router"]

custom_components/nestquest/__init__.py

@@ -496,6 +496,7 @@ async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
             hass,
             entry_id=entry.entry_id,
             database=database,
+            settings=settings,
             update_interval_seconds=entry.options.get(
                 CONF_UPDATE_INTERVAL, DEFAULT_UPDATE_INTERVAL
             ),

custom_components/nestquest/coordinator.py

@@ -11,6 +11,15 @@ refresh updates the whole board coherently.
 host clock and never UTC, matching the materialization and completion
 layers.
 
+The snapshot assembly itself lives in the Home-Assistant-free
+:mod:`custom_components.nestquest.core.snapshot` module
+(:func:`~core.snapshot.build_snapshot`); this coordinator is now a thin
+HA wrapper that resolves the local timezone and reads the settings handed
+into its constructor, then delegates to that builder, passing the SAME
+HA-local ``now`` it resolved in one clock read.  The API service's panel
+snapshot route shares the same builder, so both consumers render ONE
+snapshot shape.
+
 Presence is resolved through the SAME engine the materializer uses
 (:class:`~.presence.PresenceEngine`): schedules and overrides are read
 with the public DAO methods and the engine's anchor-date arithmetic
@@ -27,13 +36,11 @@ from __future__ import annotations
 
 import asyncio
 import datetime
-from dataclasses import dataclass
 from zoneinfo import ZoneInfo
 
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.update_coordinator import DataUpdateCoordinator
 
-from .completion import derive_state
 from .const import (
     CONF_UPDATE_INTERVAL,
     DEFAULT_UPDATE_INTERVAL,
@@ -41,66 +48,21 @@ from .const import (
     LOGGER,
     MIN_UPDATE_INTERVAL,
 )
-from .dao_children import ChildrenDao
-from .dao_instances import (
-    CompletionEventsDao,
-    QuestInstancesDao,
-)
-from .dao_rules import QuestDefinitionsDao
-from .dao_presence import PresenceOverridesDao, PresenceSchedulesDao
-from .db import NestQuestDatabase
-from .presence import (
-    MAX_PREVIEW_SCAN_DAYS,
-    PresenceEngine,
-    PresenceOverride,
-    PresenceSchedule,
+from .core.db import NestQuestDatabase
+from .core.settings import NestQuestSettings
+from .core.snapshot import (
+    ChildDaySnapshot,
+    NestQuestSnapshot,
+    QuestInstanceView,
+    build_snapshot,
 )
 
-
-@dataclass(frozen=True)
-class QuestInstanceView:
-    """One instance plus everything the entities render from it."""
-
-    instance_id: int
-    definition_id: int
-    child_id: int
-    title: str
-    icon: str | None
-    window: str
-    due_date: str
-    due_time: str | None
-    state: str  # open | done | missed
-    overdue: bool
-    completed_at: str | None
-    was_on_time: bool | None
-
-
-@dataclass(frozen=True)
-class ChildDaySnapshot:
-    """One active child's day: instances, presence, and rollup counts."""
-
-    child_id: int
-    child_name: str
-    instances: tuple[QuestInstanceView, ...]
-    present: bool
-    due_today: int
-    completed_today: int
-    remaining_today: int
-    completion_pct: int
-    #: For a child away today: the ISO date of their next present day
-    #: (the panel's away plate renders ``Returns <weekday>, <Mon D>``
-    #: from it).  ``None`` when the child is present today or no
-    #: present day exists within the presence engine's scan cap.
-    next_present: str | None = None
-
-
-@dataclass(frozen=True)
-class NestQuestSnapshot:
-    """The coordinator's whole-entity data payload."""
-
-    today_iso: str
-    children: tuple[ChildDaySnapshot, ...]
-    cycle_day: int
+__all__ = [
+    "ChildDaySnapshot",
+    "NestQuestCoordinator",
+    "NestQuestSnapshot",
+    "QuestInstanceView",
+]
 
 
 class NestQuestCoordinator(DataUpdateCoordinator):
@@ -121,6 +83,7 @@ class NestQuestCoordinator(DataUpdateCoordinator):
         *,
         entry_id: str,
         database: NestQuestDatabase,
+        settings: NestQuestSettings,
         update_interval_seconds: int | None = None,
     ) -> None:
         interval = update_interval_seconds
@@ -138,6 +101,7 @@ class NestQuestCoordinator(DataUpdateCoordinator):
         )
         self.entry_id = entry_id
         self.database = database
+        self.settings = settings
         self._refresh_lock = asyncio.Lock()
 
     async def async_refresh(self) -> None:
@@ -153,140 +117,6 @@ class NestQuestCoordinator(DataUpdateCoordinator):
 
     async def _async_update_data(self) -> NestQuestSnapshot:
         now = self._local_now()
-        today = now.date()
-        today_iso = today.isoformat()
-
-        children = await ChildrenDao(self.database).list_active()
-
-        schedules: dict[int, PresenceSchedule] = {}
-        overrides: dict[int, list[PresenceOverride]] = {}
-        for child in children:
-            schedule = await PresenceSchedulesDao(self.database).get_by_child(
-                child.id
-            )
-            if schedule is not None:
-                schedules[child.id] = PresenceSchedule.decode(
-                    child.id, schedule.anchor_date, schedule.pattern
-                )
-            window_end = today + datetime.timedelta(
-                days=MAX_PREVIEW_SCAN_DAYS
-            )
-            window_end_iso = window_end.isoformat()
-            ranged = await PresenceOverridesDao(
-                self.database
-            ).list_by_child_and_range(child.id, today_iso, window_end_iso)
-            if ranged:
-                # The engine validates MODEL objects, not DAO records;
-                # each record converts losslessly (the schema guarantees
-                # end >= start and a real is_present).
-                overrides[child.id] = [
-                    PresenceOverride(
-                        record.child_id,
-                        record.start_date,
-                        record.end_date,
-                        record.is_present,
-                        record.note,
-                    )
-                    for record in ranged
-                ]
-        engine = PresenceEngine(schedules, overrides)
-
-        instances_dao = QuestInstancesDao(self.database)
-        events_dao = CompletionEventsDao(self.database)
-        definitions_dao = QuestDefinitionsDao(self.database)
-
-        snapshots: list[ChildDaySnapshot] = []
-        for child in children:
-            instances = await instances_dao.list_by_date_range(
-                child.id, today_iso, today_iso
-            )
-            views: list[QuestInstanceView] = []
-            for instance in instances:
-                latest = await events_dao.get_latest_for_instance(instance.id)
-                definition = await definitions_dao.get(instance.definition_id)
-                state = derive_state(instance, latest, today)
-                overdue = False
-                if state == "open" and instance.due_date == today_iso:
-                    if instance.due_time is not None:
-                        due_moment = datetime.datetime.strptime(
-                            instance.due_time, "%H:%M"
-                        ).time()
-                        overdue = now.time() > due_moment
-                views.append(
-                    QuestInstanceView(
-                        instance_id=instance.id,
-                        definition_id=instance.definition_id,
-                        child_id=instance.child_id,
-                        title=definition.title if definition else "Quest",
-                        icon=definition.icon if definition else None,
-                        window=instance.window,
-                        due_date=instance.due_date,
-                        due_time=instance.due_time,
-                        state=state,
-                        overdue=overdue,
-                        completed_at=(
-                            latest.occurred_at
-                            if latest is not None
-                            and latest.event_type == "completed"
-                            else None
-                        ),
-                        was_on_time=(
-                            latest.was_on_time
-                            if latest is not None
-                            and latest.event_type == "completed"
-                            else None
-                        ),
-                    )
-                )
-            due = len(views)
-            completed = sum(1 for view in views if view.state == "done")
-            remaining = due - completed
-            child_present = engine.is_present(child.id, today)
-            next_present: str | None = None
-            if not child_present:
-                try:
-                    next_present = engine.next_present_dates(
-                        child.id, today, 1
-                    )[0].isoformat()
-                except ValueError:
-                    next_present = None
-            snapshots.append(
-                ChildDaySnapshot(
-                    child_id=child.id,
-                    child_name=child.display_name,
-                    instances=tuple(views),
-                    present=child_present,
-                    due_today=due,
-                    completed_today=completed,
-                    remaining_today=remaining,
-                    completion_pct=(
-                        round(completed * 100 / due) if due else 100
-                    ),
-                    next_present=next_present,
-                )
-            )
-
-        return NestQuestSnapshot(
-            today_iso=today_iso,
-            children=tuple(snapshots),
-            cycle_day=_cycle_day(schedules, children, today),
+        return await build_snapshot(
+            self.database, self.settings, now
         )
-
-
-def _cycle_day(
-    schedules: dict[int, PresenceSchedule], children, today: datetime.date
-) -> int:
-    """Return today's 1-based day in the first scheduled child's cycle.
-
-    Anchor-date arithmetic ONLY (D-004): the day offset is computed from
-    the schedule's own anchor, never ISO week numbers or parity, so a
-    53-week year cannot silently invert the cycle.
-    """
-    for child in children:
-        schedule = schedules.get(child.id)
-        if schedule is None:
-            continue
-        days = (today - schedule.anchor_date).days
-        cycle_length = schedule.cycle_length_weeks * 7
-        return (days % cycle_length) + 1
-    return 0

custom_components/nestquest/core/snapshot.py

@@ -0,0 +1,306 @@
+"""Pure, Home-Assistant-free panel snapshot builder.
+
+The household snapshot the NestQuest panel renders — active children in
+sort order, each child's today-instances in the documented payload shape
+(missed instances OMITTED from the entity-facing attribute payload, but
+retained on the snapshot for the count rollups), per-child counts and
+presence, and the custody cycle day — used to be assembled inline inside
+:mod:`custom_components.nestquest.coordinator`'s
+``_async_update_data``.  That assembly is HA-coupled only because its
+host is a :class:`~homeassistant.helpers.update_coordinator.DataUpdateCoordinator`;
+the assembly itself touches no HA surface.
+
+This module holds the pure pieces — the snapshot dataclasses
+(:class:`QuestInstanceView`, :class:`ChildDaySnapshot`,
+:class:`NestQuestSnapshot`), the cycle-day helper (:func:`_cycle_day`),
+the panel payload shaper (:func:`instance_payload`), and the async
+:func:`build_snapshot` builder — so the HA coordinator and the API
+service's panel snapshot route share ONE implementation of both the
+snapshot assembly and the entity-facing attribute payload shape.
+Nothing here imports :mod:`homeassistant`; the builder takes the
+database, the settings object, and the HA-local ``now`` (a single
+clock read the caller already resolved, from which it derives
+``today``) and returns the snapshot, mirroring exactly what the
+coordinator used to do inline.
+
+``settings`` is accepted because the API route hands in the entry's
+:class:`~.settings.NestQuestSettings`; it is CURRENTLY UNUSED — the
+assembly reads nothing from it — and is retained so the builder's
+contract stays stable if a future panel feature derives scan caps or
+rollup behaviour from configuration.  No speculative read is wired in.
+"""
+from __future__ import annotations
+
+import datetime
+from collections.abc import Iterable
+from dataclasses import dataclass
+from typing import Any
+
+from .completion import derive_state
+from .dao_children import ChildrenDao
+from .dao_instances import CompletionEventsDao, QuestInstancesDao
+from .dao_presence import PresenceOverridesDao, PresenceSchedulesDao
+from .dao_rules import QuestDefinitionsDao
+from .db import NestQuestDatabase
+from .presence import (
+    MAX_PREVIEW_SCAN_DAYS,
+    PresenceEngine,
+    PresenceOverride,
+    PresenceSchedule,
+)
+from .settings import NestQuestSettings
+
+
+@dataclass(frozen=True)
+class QuestInstanceView:
+    """One instance plus everything the entities render from it."""
+
+    instance_id: int
+    definition_id: int
+    child_id: int
+    title: str
+    icon: str | None
+    window: str
+    due_date: str
+    due_time: str | None
+    state: str  # open | done | missed
+    overdue: bool
+    completed_at: str | None
+    was_on_time: bool | None
+
+
+@dataclass(frozen=True)
+class ChildDaySnapshot:
+    """One active child's day: instances, presence, and rollup counts."""
+
+    child_id: int
+    child_name: str
+    instances: tuple[QuestInstanceView, ...]
+    present: bool
+    due_today: int
+    completed_today: int
+    remaining_today: int
+    completion_pct: int
+    #: For a child away today: the ISO date of their next present day
+    #: (the panel's away plate renders ``Returns <weekday>, <Mon D>``
+    #: from it).  ``None`` when the child is present today or no
+    #: present day exists within the presence engine's scan cap.
+    next_present: str | None = None
+
+
+@dataclass(frozen=True)
+class NestQuestSnapshot:
+    """The coordinator's whole-entity data payload."""
+
+    today_iso: str
+    children: tuple[ChildDaySnapshot, ...]
+    cycle_day: int
+
+
+def _cycle_day(
+    schedules: dict[int, PresenceSchedule], children, today: datetime.date
+) -> int:
+    """Return today's 1-based day in the first scheduled child's cycle.
+
+    Anchor-date arithmetic ONLY (D-004): the day offset is computed from
+    the schedule's own anchor, never ISO week numbers or parity, so a
+    53-week year cannot silently invert the cycle.
+    """
+    for child in children:
+        schedule = schedules.get(child.id)
+        if schedule is None:
+            continue
+        days = (today - schedule.anchor_date).days
+        cycle_length = schedule.cycle_length_weeks * 7
+        return (days % cycle_length) + 1
+    return 0
+
+
+def instance_payload(
+    instances: Iterable[QuestInstanceView], *, include_missed: bool
+) -> list[dict[str, Any]]:
+    """Shape instance dicts per ENTITIES-AND-SERVICES.md §1.
+
+    The panel payload ``state`` is the documented ``open`` | ``completed``
+    spelling, so the builder's derived ``done`` maps to ``completed`` here;
+    ``open`` passes through.  ``missed`` instances are OMITTED from the
+    entity-facing attribute payload (decision 5) unless ``include_missed``
+    is set — the admin payload (D-009) keeps them with their ``missed``
+    state.  ``on_time`` passes the builder's ``was_on_time`` through
+    verbatim (``True`` / ``False`` for a completed instance, ``None`` for
+    an open one).  This is the SINGLE shared implementation both the HA
+    sensor layer and the API panel route read; it touches no Home
+    Assistant surface.
+    """
+    payload: list[dict[str, Any]] = []
+    for view in instances:
+        if view.state == "missed" and not include_missed:
+            continue
+        payload.append(
+            {
+                "id": view.instance_id,
+                "definition_id": view.definition_id,
+                "child_id": view.child_id,
+                "title": view.title,
+                "icon": view.icon,
+                "window": view.window,
+                "due_time": view.due_time,
+                "state": (
+                    "completed" if view.state == "done" else view.state
+                ),
+                "overdue": view.overdue,
+                "completed_at": view.completed_at,
+                "on_time": view.was_on_time,
+            }
+        )
+    return payload
+
+
+async def build_snapshot(
+    database: NestQuestDatabase,
+    settings: NestQuestSettings,
+    now: datetime.datetime,
+) -> NestQuestSnapshot:
+    """Build the household panel snapshot for ``today`` at the ``now`` instant.
+
+    Mirrors the assembly that lived in the coordinator's
+    ``_async_update_data``: active children in sort order, each child's
+    today-instances with derived state (open / done / missed via
+    :func:`~.completion.derive_state`) and the overdue flag, per-child
+    presence (resolved through :class:`~.presence.PresenceEngine`), the
+    per-child rollup counts, and the custody cycle day of the first
+    scheduled active child.  Missed instances are retained on the
+    snapshot (the rollup counts and the panel's missed plate need them)
+    but the entity-facing attribute payload omits them at the
+    :func:`instance_payload` layer — this builder produces the shared
+    shape both consumers read.
+
+    ``now`` is the HA-local timezone-aware datetime the caller already
+    resolved (a SINGLE clock read); the overdue check compares
+    ``now.time()`` against the instance's ``due_time`` for today's open
+    instances.  The builder performs NO internal clock read — it never
+    calls :func:`datetime.datetime.now` — so the instant is pinned in
+    tests.  ``today`` is derived INSIDE the builder as ``now.date()``,
+    so the calendar date that anchors the due-date and cycle-day
+    arithmetic is always the SAME clock read as the wall-clock time;
+    the two can never disagree.  ``settings`` is accepted but currently
+    unused (see the module docstring).
+    """
+    today = now.date()
+    today_iso = today.isoformat()
+
+    children = await ChildrenDao(database).list_active()
+
+    schedules: dict[int, PresenceSchedule] = {}
+    overrides: dict[int, list[PresenceOverride]] = {}
+    for child in children:
+        schedule = await PresenceSchedulesDao(database).get_by_child(
+            child.id
+        )
+        if schedule is not None:
+            schedules[child.id] = PresenceSchedule.decode(
+                child.id, schedule.anchor_date, schedule.pattern
+            )
+        window_end = today + datetime.timedelta(
+            days=MAX_PREVIEW_SCAN_DAYS
+        )
+        window_end_iso = window_end.isoformat()
+        ranged = await PresenceOverridesDao(
+            database
+        ).list_by_child_and_range(child.id, today_iso, window_end_iso)
+        if ranged:
+            # The engine validates MODEL objects, not DAO records;
+            # each record converts losslessly (the schema guarantees
+            # end >= start and a real is_present).
+            overrides[child.id] = [
+                PresenceOverride(
+                    record.child_id,
+                    record.start_date,
+                    record.end_date,
+                    record.is_present,
+                    record.note,
+                )
+                for record in ranged
+            ]
+    engine = PresenceEngine(schedules, overrides)
+
+    instances_dao = QuestInstancesDao(database)
+    events_dao = CompletionEventsDao(database)
+    definitions_dao = QuestDefinitionsDao(database)
+
+    snapshots: list[ChildDaySnapshot] = []
+    for child in children:
+        instances = await instances_dao.list_by_date_range(
+            child.id, today_iso, today_iso
+        )
+        views: list[QuestInstanceView] = []
+        for instance in instances:
+            latest = await events_dao.get_latest_for_instance(instance.id)
+            definition = await definitions_dao.get(instance.definition_id)
+            state = derive_state(instance, latest, today)
+            overdue = False
+            if state == "open" and instance.due_date == today_iso:
+                if instance.due_time is not None:
+                    due_moment = datetime.datetime.strptime(
+                        instance.due_time, "%H:%M"
+                    ).time()
+                    overdue = now.time() > due_moment
+            views.append(
+                QuestInstanceView(
+                    instance_id=instance.id,
+                    definition_id=instance.definition_id,
+                    child_id=instance.child_id,
+                    title=definition.title if definition else "Quest",
+                    icon=definition.icon if definition else None,
+                    window=instance.window,
+                    due_date=instance.due_date,
+                    due_time=instance.due_time,
+                    state=state,
+                    overdue=overdue,
+                    completed_at=(
+                        latest.occurred_at
+                        if latest is not None
+                        and latest.event_type == "completed"
+                        else None
+                    ),
+                    was_on_time=(
+                        latest.was_on_time
+                        if latest is not None
+                        and latest.event_type == "completed"
+                        else None
+                    ),
+                )
+            )
+        due = len(views)
+        completed = sum(1 for view in views if view.state == "done")
+        remaining = due - completed
+        child_present = engine.is_present(child.id, today)
+        next_present: str | None = None
+        if not child_present:
+            try:
+                next_present = engine.next_present_dates(
+                    child.id, today, 1
+                )[0].isoformat()
+            except ValueError:
+                next_present = None
+        snapshots.append(
+            ChildDaySnapshot(
+                child_id=child.id,
+                child_name=child.display_name,
+                instances=tuple(views),
+                present=child_present,
+                due_today=due,
+                completed_today=completed,
+                remaining_today=remaining,
+                completion_pct=(
+                    round(completed * 100 / due) if due else 100
+                ),
+                next_present=next_present,
+            )
+        )
+
+    return NestQuestSnapshot(
+        today_iso=today_iso,
+        children=tuple(snapshots),
+        cycle_day=_cycle_day(schedules, children, today),
+    )

custom_components/nestquest/sensor.py

@@ -39,6 +39,7 @@ from .coordinator import (
     NestQuestCoordinator,
     QuestInstanceView,
 )
+from .core.snapshot import instance_payload
 
 #: Home Assistant's state machine refuses states longer than 255
 #: characters (its hard recorder/state limit).  These sensors' states
@@ -63,40 +64,6 @@ def _state_within_limit(state: Any) -> Any:
     return state
 
 
-def _instance_payload(
-    instances: Iterable[QuestInstanceView], *, include_missed: bool
-) -> list[dict[str, Any]]:
-    """Shape instance dicts per ENTITIES-AND-SERVICES.md §1.
-
-    ``state`` maps the coordinator's derived ``done`` to the panel's
-    ``completed`` spelling; ``missed`` instances are omitted unless
-    ``include_missed`` (the admin payload, D-009, keeps them with
-    their ``missed`` state).
-    """
-    payload: list[dict[str, Any]] = []
-    for view in instances:
-        if view.state == "missed" and not include_missed:
-            continue
-        payload.append(
-            {
-                "id": view.instance_id,
-                "definition_id": view.definition_id,
-                "child_id": view.child_id,
-                "title": view.title,
-                "icon": view.icon,
-                "window": view.window,
-                "due_time": view.due_time,
-                "state": (
-                    "completed" if view.state == "done" else view.state
-                ),
-                "overdue": view.overdue,
-                "completed_at": view.completed_at,
-                "on_time": view.was_on_time,
-            }
-        )
-    return payload
-
-
 #: State reported by the next-quest sensor when the child owes nothing
 #: else today.  A documented sentinel, never an empty string (an empty
 #: state reads as "sensor went unavailable" in HA).
@@ -215,10 +182,10 @@ class NestQuestQuestsDueTodaySensor(_NestQuestChildDaySensor):
         if child is None:
             return None
         return {
-            "instances": _instance_payload(
+            "instances": instance_payload(
                 child.instances, include_missed=False
             ),
-            "admin_instances": _instance_payload(
+            "admin_instances": instance_payload(
                 child.instances, include_missed=True
             ),
             "child_id": child.child_id,

pyproject.toml

@@ -7,11 +7,20 @@ requires-python = ">=3.11"
 dependencies = []
 
 [dependency-groups]
+# fastapi and uvicorn live in the DEV group only so the monorepo's test
+# venv can exercise the API app (tests under tests/test_api_health.py).
+# They are NOT runtime dependencies of the NestQuest HA integration.
+# When the API deployable is packaged (Feature 17), its runtime
+# dependencies — fastapi, uvicorn, and any others — MUST be declared in
+# that deployable's own dependency manifest, not here.
 dev = [
+    "fastapi>=0.115",
+    "httpx>=0.28",
     "jinja2>=3",
     "pytest>=8.0.0",
     "pytest-asyncio>=0.24",
     "pyyaml>=6",
+    "uvicorn>=0.30",
     "voluptuous>=0.14",
 ]
 

tests/test_api_health.py

@@ -0,0 +1,336 @@
+"""FastAPI skeleton tests: health, OpenAPI, core wiring (task 042dfc5c).
+
+These tests start the NestQuest API app with httpx against the ASGI
+app and assert the skeleton contract of Feature 16's first task:
+
+- ``GET /health`` returns 200 with a JSON status body (``status: ok``)
+  and does NOT leak the filesystem path;
+- ``GET /docs`` (Swagger UI) is served, and ``GET /openapi.json``
+  returns the OpenAPI document;
+- the app wires core (opens the configured SQLite file and applies
+  migrations on startup via the lifespan) and closes the connection on
+  shutdown (``connected is False`` afterwards);
+- ``ApiConfig.from_env`` raises when ``NESTQUEST_DB_PATH`` is missing or
+  empty, and returns the value when set;
+- a startup failure (unwritable path / non-SQLite file) surfaces from
+  the lifespan rather than the first request;
+- each test is hermetic — it points ``NESTQUEST_DB_PATH`` at a fresh
+  temp file.
+
+A SEPARATE subprocess test asserts the stronger invariant the task
+calls out: the app imports the bundled ``core`` WITHOUT importing
+``homeassistant``.  That cannot run inside the pytest process because
+``tests/conftest.py`` installs mock ``homeassistant`` modules globally
+before any test imports the integration; a subprocess with a clean
+``sys.modules`` is the only honest proof (the same approach
+``tests/test_core_no_ha_smoke.py`` takes for the core bundle).
+"""
+from __future__ import annotations
+
+import subprocess
+import sys
+import tempfile
+import textwrap
+from pathlib import Path
+
+import httpx
+import pytest
+
+from api.app import create_app
+from api.config import ApiConfig, ConfigError
+from api.database import DatabaseState, _executor, make_database
+
+#: The repo root, so the no-HA subprocess can import the API package.
+_REPO_ROOT = Path(__file__).resolve().parent.parent
+
+#: The marker the no-HA subprocess prints on success.
+_SUCCESS_MARKER = "API NO-HA IMPORT OK"
+
+
+@pytest.fixture
+def temp_db_path(tmp_path: Path) -> str:
+    """A fresh per-test SQLite path under pytest's tmp_path."""
+    return str(tmp_path / "nestquest.db")
+
+
+class _AppRunner:
+    """Run the app's lifespan around an httpx AsyncClient.
+
+    httpx's :class:`ASGITransport` does NOT run the ASGI lifespan on its
+    own, so the database would never open.  Starlette exposes the app's
+    lifespan as ``app.router.lifespan_context``; wrapping the client
+    session in it drives the same startup/shutdown path uvicorn would,
+    so ``open_and_migrate`` runs before the first request and ``close``
+    runs after the last.
+
+    ``__aexit__`` uses try/finally so a client-side error still shuts
+    the lifespan down — otherwise a failure mid-test would leak the
+    database connection open.
+    """
+
+    def __init__(self, db_path: str) -> None:
+        # The token value is irrelevant to these tests (the health
+        # route is unauthenticated); it just satisfies the required
+        # field — the panel token's own tests live in test_api_panel.py.
+        self.app = create_app(
+            ApiConfig(db_path=db_path, panel_token="health-runner-token")
+        )
+
+    async def __aenter__(self) -> httpx.AsyncClient:
+        self._lifespan = self.app.router.lifespan_context(self.app)
+        await self._lifespan.__aenter__()
+        self._client = httpx.AsyncClient(
+            transport=httpx.ASGITransport(app=self.app),
+            base_url="http://testserver",
+        )
+        return await self._client.__aenter__()
+
+    async def __aexit__(self, *exc) -> None:
+        try:
+            await self._client.__aexit__(*exc)
+        finally:
+            await self._lifespan.__aexit__(*exc)
+
+
+@pytest.fixture
+async def app_client(temp_db_path: str) -> httpx.AsyncClient:
+    async with _AppRunner(temp_db_path) as client:
+        yield client
+
+
+# --- ApiConfig.from_env -------------------------------------------------
+
+
+def test_from_env_returns_set_value() -> None:
+    """Set, non-empty env values are returned verbatim."""
+    cfg = ApiConfig.from_env(
+        {
+            "NESTQUEST_DB_PATH": "/data/nq.db",
+            "NESTQUEST_PANEL_TOKEN": "panel-token",
+        }
+    )
+    assert cfg.db_path == "/data/nq.db"
+    assert cfg.panel_token == "panel-token"
+
+
+def test_from_env_raises_on_empty_value() -> None:
+    """An empty/whitespace-only value raises ConfigError (no silent default)."""
+    with pytest.raises(ConfigError):
+        ApiConfig.from_env({"NESTQUEST_DB_PATH": "   "})
+
+
+def test_from_env_raises_on_missing_value() -> None:
+    """A missing NESTQUEST_DB_PATH raises ConfigError (no silent default)."""
+    with pytest.raises(ConfigError):
+        ApiConfig.from_env({})
+
+
+# --- health / openapi / docs -------------------------------------------
+
+
+async def test_health_returns_200_with_status_body(
+    app_client: httpx.AsyncClient,
+) -> None:
+    """GET /health returns 200 with status ok and no filesystem path."""
+    response = await app_client.get("/health")
+    assert response.status_code == 200
+    body = response.json()
+    assert body == {"status": "ok"}
+    assert "db_path" not in body
+
+
+async def test_openapi_document_is_served(
+    app_client: httpx.AsyncClient,
+) -> None:
+    """GET /openapi.json returns the OpenAPI document."""
+    response = await app_client.get("/openapi.json")
+    assert response.status_code == 200
+    schema = response.json()
+    assert schema["openapi"].startswith("3.")
+    assert "/health" in schema["paths"]
+
+
+async def test_docs_swagger_ui_is_served(app_client: httpx.AsyncClient) -> None:
+    """GET /docs serves the Swagger UI HTML (OpenAPI at /docs)."""
+    response = await app_client.get("/docs")
+    assert response.status_code == 200
+    assert "swagger" in response.text.lower()
+
+
+# --- core wiring & shutdown --------------------------------------------
+
+
+async def test_app_wires_core_and_applies_migrations(
+    temp_db_path: str,
+) -> None:
+    """The lifespan opens the SQLite file and applies migrations.
+
+    After startup, the file exists and carries the NestQuest schema
+    version stamp — proving the app imported core, opened the database
+    at the configured path, and ran the migration runner.
+    """
+    async with _AppRunner(temp_db_path):
+        assert Path(temp_db_path).exists()
+    # Re-open the file with a fresh core database to read the version
+    # stamp independent of the app's connection.  Reuse the API's own
+    # executor so the test exercises the same wiring the app does.
+    from api.nestquest_core import core_db, core_migrations
+
+    database = core_db.NestQuestDatabase(_executor)
+    await database.open(temp_db_path)
+    try:
+        version = await core_migrations.read_schema_version(database)
+    finally:
+        await database.close()
+    assert version >= 1
+
+
+async def test_shutdown_closes_the_connection(temp_db_path: str) -> None:
+    """The lifespan closes the database connection on shutdown.
+
+    After the runner exits, ``DatabaseState.database.connected`` is
+    False — proving ``close()`` ran (the lifespan's finally block) even
+    on a clean exit.
+    """
+    runner = _AppRunner(temp_db_path)
+    async with runner as _client:
+        state: DatabaseState = runner.app.state.db
+        assert state.database.connected
+    assert not state.database.connected
+
+
+# --- startup failure ----------------------------------------------------
+
+
+async def test_startup_fails_on_unwritable_path(tmp_path: Path) -> None:
+    """A database path whose parent directory does not exist fails fast.
+
+    ``sqlite3.connect`` raises ``OperationalError`` for a path under a
+    non-existent directory; the lifespan surfaces that as a startup
+    error rather than the first request.  The connection is closed
+    through the lifespan's finally block (``close`` is a no-op on a
+    never-opened wrapper).
+    """
+    bad_path = str(tmp_path / "does_not_exist" / "nestquest.db")
+    runner = _AppRunner(bad_path)
+    with pytest.raises(Exception):
+        async with runner:
+            pass
+
+
+async def test_startup_fails_on_non_sqlite_file(tmp_path: Path) -> None:
+    """A path pointing at a non-SQLite file fails fast on startup.
+
+    Opening an existing file that is not a SQLite database makes the
+    ``PRAGMA journal_mode=WAL`` run during :meth:`open` raise
+    ``DatabaseError: file is not a database``; the lifespan surfaces it.
+    """
+    bad_file = tmp_path / "not_a_db.bin"
+    bad_file.write_bytes(b"this is not a sqlite database")
+    runner = _AppRunner(str(bad_file))
+    with pytest.raises(Exception):
+        async with runner:
+            pass
+
+
+# --- no-HA subprocess ---------------------------------------------------
+
+#: The no-HA subprocess script.  Runs with ``sys.executable -c`` so it
+#: starts with a clean ``sys.modules`` and no ``homeassistant`` installed
+#: (the suite's conftest stubs are not present in a subprocess).  It
+#: builds the app — which triggers the core bootstrap — and asserts
+#: neither ``homeassistant`` nor ``custom_components`` entered
+#: ``sys.modules``, and that the loaded core package's ``__file__``
+#: points at the bundled directory.
+_NO_HA_SCRIPT = textwrap.dedent(
+    """\
+    import sys
+    import tempfile
+    from pathlib import Path
+
+    sys.path.insert(0, sys.argv[1])
+    REPO_ROOT = Path(sys.argv[1])
+
+    # homeassistant must not be present before we touch the API.
+    assert "homeassistant" not in sys.modules, (
+        "homeassistant already in sys.modules before app import — the "
+        "subprocess is not a clean no-HA process"
+    )
+
+    from api.app import create_app
+    from api.config import ApiConfig
+    from api.nestquest_core import core
+
+    # The app build imports core via api.nestquest_core.  core is a
+    # Home-Assistant-free package; if it (or its loader) ever drags HA
+    # in, this fails.
+    assert "homeassistant" not in sys.modules, (
+        "homeassistant imported while building the NestQuest API app — "
+        "the core wiring is no longer Home-Assistant-free"
+    )
+    # The loader registers core under the distinct name "nestquest_core"
+    # WITHOUT executing custom_components.nestquest.__init__, so the
+    # parent integration package must never be registered, and no
+    # sys.path mutation places the integration directory on sys.path.
+    assert "custom_components" not in sys.modules, (
+        "custom_components registered in sys.modules — the core loader "
+        "executed the integration's HA-coupled __init__ instead of loading "
+        "core by file location"
+    )
+    assert "nestquest_core" in sys.modules, "core was not imported"
+
+    # core.__file__ must point at the bundled directory inside the
+    # integration, proving the file-location loader resolved against the
+    # bundled package rather than some other "core" on sys.path.
+    expected_core_dir = (
+        REPO_ROOT / "custom_components" / "nestquest" / "core"
+    )
+    assert Path(core.__file__).resolve() == (
+        expected_core_dir / "__init__.py"
+    ).resolve(), (
+        f"core.__file__={core.__file__} does not point at the bundled "
+        f"directory {expected_core_dir}"
+    )
+
+    # Build the app (the lifespan is NOT run here, so the path is never
+    # opened — it just needs to be a non-empty string to satisfy the
+    # fail-fast config check).  Use a temp path so nothing is created;
+    # the panel token value is irrelevant to this import-only check.
+    app = create_app(ApiConfig(db_path=str(
+        Path(tempfile.gettempdir()) / "nq-noha-buildonly.db"
+    ), panel_token="noha-import-token"))
+    assert app is not None
+
+    print("API NO-HA IMPORT OK")
+    """
+)
+
+
+def test_app_imports_core_without_importing_homeassistant() -> None:
+    """The app imports core without importing homeassistant (subprocess).
+
+    Runs in a subprocess because ``tests/conftest.py`` installs mock
+    ``homeassistant`` modules into the pytest process's ``sys.modules``
+    before any test runs, so an in-process check could never
+    distinguish "core never touched HA" from "conftest already stubbed
+    HA for us".  The subprocess is a genuine no-HA process; if the
+    core loader (or core itself) ever grows a ``homeassistant``
+    import, the subprocess exits non-zero with ``ModuleNotFoundError``.
+    """
+    result = subprocess.run(
+        [sys.executable, "-c", _NO_HA_SCRIPT, str(_REPO_ROOT)],
+        capture_output=True,
+        text=True,
+        timeout=120,
+    )
+    if result.returncode != 0:
+        raise AssertionError(
+            f"no-HA app-import subprocess exited {result.returncode}.\n"
+            f"--- stdout ---\n{result.stdout}\n"
+            f"--- stderr ---\n{result.stderr}"
+        )
+    assert _SUCCESS_MARKER in result.stdout, (
+        f"success marker {_SUCCESS_MARKER!r} not printed.\n"
+        f"--- stdout ---\n{result.stdout}\n"
+        f"--- stderr ---\n{result.stderr}"
+    )

tests/test_api_panel.py

@@ -0,0 +1,688 @@
+"""Panel-plane route tests: service token + snapshot (task ae7e90ae).
+
+These tests exercise the NestQuest API's panel plane against the ASGI
+app with httpx:
+
+- ``GET /api/v1/panel/snapshot`` requires the panel service token
+  (D-012): a request with NO ``Authorization`` header, a MALFORMED
+  header, and a WRONG token all return 401; the correct Bearer token
+  returns 200.
+- The 200 body is the documented snapshot shape: ``today_iso``,
+  ``cycle_day``, and ``children`` in the household's sort order, each
+  carrying ``child_id``/``child_name``/``present``/``next_present``,
+  the per-day rollup counts, and its instances in the documented panel
+  payload shape (ENTITIES-AND-SERVICES.md §1) with missed instances
+  OMITTED (D-009).
+- ``ApiConfig.from_env`` requires ``NESTQUEST_PANEL_TOKEN`` with the
+  same fail-fast discipline as ``NESTQUEST_DB_PATH``.
+
+The household is seeded through the SAME core copy the app uses — the
+``nestquest_core.*`` package registered by ``api/nestquest_core.py`` —
+NOT the conftest-stubbed ``custom_components.nestquest.core`` copy (see
+the two-copy caveat in api/nestquest_core.py's docstring: never compare
+class or exception identity across the two copies).  The seed opens and
+migrates its own connection on the app's SQLite path and closes BEFORE
+the app's lifespan opens the file, so the two connections never
+overlap.
+
+The route's single clock read (:func:`api.routes_panel._local_now`) is
+pinned with monkeypatch the same way the coordinator's ``_local_now``
+is pinned in test_core_snapshot.py, so the seeded rows and the
+snapshot's ``today`` can never straddle midnight.
+"""
+from __future__ import annotations
+
+import datetime
+import importlib
+from pathlib import Path
+from types import SimpleNamespace
+from zoneinfo import ZoneInfo
+
+import httpx
+import pytest
+
+from api import routes_panel
+from api.app import create_app
+from api.config import ApiConfig, ConfigError
+from api.database import _executor
+from api.nestquest_core import (
+    core_db,
+    core_migrations,
+    core_snapshot,
+)
+
+#: The panel service token the test apps are configured with.
+PANEL_TOKEN = "panel-service-token-test"
+
+# The bundled core submodules, through the SAME copy the app uses
+# (nestquest_core.*, NOT the conftest-stubbed custom_components copy).
+_children = importlib.import_module("nestquest_core.children")
+_quest_definitions = importlib.import_module(
+    "nestquest_core.quest_definitions"
+)
+_materialize = importlib.import_module("nestquest_core.materialize")
+_recurrence = importlib.import_module("nestquest_core.recurrence")
+_dao_presence = importlib.import_module("nestquest_core.dao_presence")
+_dao_instances = importlib.import_module("nestquest_core.dao_instances")
+_completion = importlib.import_module("nestquest_core.completion")
+
+
+async def _events_for_instance(database: object, instance_id: int) -> list:
+    """The instance's completion events, on the app's core copy.
+
+    Uses the SAME ``nestquest_core.*`` copy the app uses (the two-copy
+    caveat: never mix copies) against the app's live connection.
+    """
+    dao = _dao_instances.CompletionEventsDao(database)
+    return await dao.list_by_instance(instance_id)
+
+
+async def _derived_state(
+    database: object, instance: object, today: datetime.date
+) -> str:
+    """The instance's derived state on the app's core copy.
+
+    ``derive_state(instance, latest, today)`` from the app's core copy;
+    the latest event is fetched through the same copy's DAO against the
+    app's live connection.
+    """
+    dao = _dao_instances.CompletionEventsDao(database)
+    latest = await dao.get_latest_for_instance(instance.id)
+    return _completion.derive_state(instance, latest, today)
+
+
+async def _seed_household(
+    db_path: str,
+    today: datetime.date,
+    pinned_now: datetime.datetime,
+) -> SimpleNamespace:
+    """Seed a two-child household on ``db_path`` and return its records.
+
+    Mirrors the test_core_snapshot.py household: an AWAY child (2-week
+    custody cycle anchored yesterday, empty week 0, an override returns
+    her today+2) with an open quest due 10:00 — overdue at the pinned
+    12:00 — and a present child whose 17:00 quest is completed at
+    12:00 (on time).  A third quest's instance is materialized due
+    YESTERDAY (via ``materialize`` with ``today`` pinned to yesterday,
+    since the no-past guard refuses past-dated writes): a past-due OPEN
+    instance, i.e. the "missed" view the panel payload must omit.
+
+    Opens, migrates, seeds, and CLOSES its own connection so the app's
+    lifespan connection never overlaps it.
+    """
+    database = core_db.NestQuestDatabase(_executor)
+    await database.open(db_path)
+    try:
+        await core_migrations.apply_migrations(database)
+        today_iso = today.isoformat()
+        yesterday = today - datetime.timedelta(days=1)
+        yesterday_iso = yesterday.isoformat()
+
+        ada = await _children.create_child(database, "Ada", sort_order=0)
+        bo = await _children.create_child(database, "Bo", sort_order=1)
+
+        # Every rule starts YESTERDAY so the yesterday materialization
+        # below (which pins ``today`` to yesterday) fires them.
+        await _quest_definitions.create_quest_definition(
+            database,
+            "Pack bag",
+            _recurrence.ScheduleRule.from_dict(
+                {"rule_type": "daily", "start_date": yesterday_iso}
+            ),
+            [ada.id],
+            [("morning", "10:00")],
+        )
+        await _quest_definitions.create_quest_definition(
+            database,
+            "Brush teeth",
+            _recurrence.ScheduleRule.from_dict(
+                {"rule_type": "daily", "start_date": yesterday_iso}
+            ),
+            [bo.id],
+            [("morning", "17:00")],
+        )
+        # Today's instances first, while Ada has no presence schedule
+        # (she is present every day, so her instance IS generated).
+        await _materialize.materialize(
+            database,
+            today_iso,
+            (today + datetime.timedelta(days=3)).isoformat(),
+            today=today,
+        )
+        # The stale quest is created AFTER the today walk, so its only
+        # instance is the yesterday one written below.
+        await _quest_definitions.create_quest_definition(
+            database,
+            "Stale chore",
+            _recurrence.ScheduleRule.from_dict(
+                {"rule_type": "daily", "start_date": yesterday_iso}
+            ),
+            [ada.id],
+            [("morning", "09:00")],
+        )
+        # Materialize yesterday with ``today`` pinned to yesterday: the
+        # no-past guard accepts the rows, and they land past-due (no
+        # completion events) — the missed view.
+        await _materialize.materialize(
+            database, yesterday_iso, yesterday_iso, today=yesterday
+        )
+        instances = _dao_instances.QuestInstancesDao(database)
+
+        ada_today = await instances.list_by_child_and_date(ada.id, today_iso)
+        assert len(ada_today) == 1
+        pack_bag_instance = ada_today[0]
+        bo_today = await instances.list_by_child_and_date(bo.id, today_iso)
+        assert len(bo_today) == 1
+        brush_teeth_instance = bo_today[0]
+        ada_yesterday = await instances.list_by_child_and_date(
+            ada.id, yesterday_iso
+        )
+        stale_instance = next(
+            record
+            for record in ada_yesterday
+            if record.due_time == "09:00"
+        )
+
+        # Ada's custody schedule, added AFTER materialization (the
+        # same order test_core_snapshot.py seeds): 2-week cycle
+        # anchored yesterday, empty week 0 covers today => absent
+        # today; an override returns her on today+2.
+        await _dao_presence.PresenceSchedulesDao(database).upsert_by_child(
+            ada.id,
+            cycle_length_weeks=2,
+            anchor_date=yesterday_iso,
+            pattern="|0,1,2,3,4,5,6",
+        )
+        returns_date = today + datetime.timedelta(days=2)
+        await _dao_presence.PresenceOverridesDao(database).create(
+            ada.id,
+            returns_date.isoformat(),
+            returns_date.isoformat(),
+            is_present=True,
+            note="visit",
+        )
+
+        # Complete Bo's today instance at the pinned 12:00 (17:00 due
+        # => on time).
+        await _completion.complete_instance(
+            database,
+            brush_teeth_instance.id,
+            actor_source="panel",
+            actor_child_id=bo.id,
+            now=pinned_now,
+            today=today,
+        )
+        return SimpleNamespace(
+            ada=ada,
+            bo=bo,
+            pack_bag_instance=pack_bag_instance,
+            brush_teeth_instance=brush_teeth_instance,
+            stale_instance=stale_instance,
+            returns_date=returns_date,
+        )
+    finally:
+        await database.close()
+
+
+class _PanelRunner:
+    """Run the app's lifespan around an httpx AsyncClient.
+
+    Same pattern as test_api_health.py's ``_AppRunner``: httpx's ASGI
+    transport does not run the lifespan, so it is driven explicitly and
+    shut down in ``__aexit__``'s finally block even on failure.
+    """
+
+    def __init__(
+        self, db_path: str, panel_token: str = PANEL_TOKEN
+    ) -> None:
+        self.app = create_app(
+            ApiConfig(db_path=db_path, panel_token=panel_token)
+        )
+
+    async def __aenter__(self) -> tuple["_PanelRunner", httpx.AsyncClient]:
+        self._lifespan = self.app.router.lifespan_context(self.app)
+        await self._lifespan.__aenter__()
+        self._client = httpx.AsyncClient(
+            transport=httpx.ASGITransport(app=self.app),
+            base_url="http://testserver",
+        )
+        await self._client.__aenter__()
+        return self, self._client
+
+    async def __aexit__(self, *exc) -> None:
+        try:
+            await self._client.__aexit__(*exc)
+        finally:
+            await self._lifespan.__aexit__(*exc)
+
+
+@pytest.fixture
+def temp_db_path(tmp_path: Path) -> str:
+    """A fresh per-test SQLite path under pytest's tmp_path."""
+    return str(tmp_path / "nestquest.db")
+
+
+@pytest.fixture
+async def panel_client(temp_db_path: str) -> httpx.AsyncClient:
+    """An app client with an empty (migrated) household database."""
+    async with _PanelRunner(temp_db_path) as runner_and_client:
+        _, client = runner_and_client
+        yield client
+
+
+@pytest.fixture
+async def seeded_panel(temp_db_path: str, monkeypatch) -> SimpleNamespace:
+    """A seeded household served by the app, with the clock pinned.
+
+    One host clock read anchors ``today``; the pinned instant is
+    12:00 UTC that day (past Ada's 10:00 due, before Bo's 17:00).  The
+    route's ``_local_now`` is patched to return the pinned instant.
+
+    Yields the runner too so tests reach the app's live database (the
+    SAME ``nestquest_core`` connection) for assertions.
+    """
+    today = datetime.datetime.now().astimezone().date()
+    time_zone = ZoneInfo("UTC")
+    pinned_now = datetime.datetime(
+        today.year, today.month, today.day, 12, 0, 0, tzinfo=time_zone
+    )
+    seed = await _seed_household(temp_db_path, today, pinned_now)
+    monkeypatch.setattr(routes_panel, "_local_now", lambda: pinned_now)
+    async with _PanelRunner(temp_db_path) as runner_and_client:
+        runner, client = runner_and_client
+        yield SimpleNamespace(
+            client=client,
+            database=runner.app.state.db.database,
+            seed=seed,
+            today=today,
+            pinned_now=pinned_now,
+            pinned_utc_iso=pinned_now.astimezone(
+                datetime.timezone.utc
+            ).isoformat(),
+        )
+
+
+# --- ApiConfig.from_env: the panel token --------------------------------
+
+
+def test_from_env_reads_panel_token() -> None:
+    """A set, non-empty NESTQUEST_PANEL_TOKEN is returned verbatim."""
+    cfg = ApiConfig.from_env(
+        {
+            "NESTQUEST_DB_PATH": "/data/nq.db",
+            "NESTQUEST_PANEL_TOKEN": "panel-token",
+        }
+    )
+    assert cfg.panel_token == "panel-token"
+
+
+def test_from_env_requires_panel_token_when_missing() -> None:
+    """A missing panel token raises ConfigError (no silent default)."""
+    with pytest.raises(ConfigError):
+        ApiConfig.from_env({"NESTQUEST_DB_PATH": "/data/nq.db"})
+
+
+def test_from_env_requires_panel_token_when_empty() -> None:
+    """An empty/whitespace panel token raises ConfigError."""
+    with pytest.raises(ConfigError):
+        ApiConfig.from_env(
+            {
+                "NESTQUEST_DB_PATH": "/data/nq.db",
+                "NESTQUEST_PANEL_TOKEN": "   ",
+            }
+        )
+
+
+# --- service-token auth --------------------------------------------------
+
+
+async def test_missing_token_is_unauthorized(
+    panel_client: httpx.AsyncClient,
+) -> None:
+    """A request with no Authorization header returns 401."""
+    response = await panel_client.get("/api/v1/panel/snapshot")
+    assert response.status_code == 401
+    assert "www-authenticate" in {
+        key.lower() for key in response.headers
+    }
+
+
+async def test_wrong_token_is_unauthorized(
+    panel_client: httpx.AsyncClient,
+) -> None:
+    """A wrong Bearer token returns 401."""
+    response = await panel_client.get(
+        "/api/v1/panel/snapshot",
+        headers={"Authorization": "Bearer not-the-panel-token"},
+    )
+    assert response.status_code == 401
+
+
+async def test_malformed_authorization_header_is_unauthorized(
+    panel_client: httpx.AsyncClient,
+) -> None:
+    """A malformed Authorization header returns 401.
+
+    Wrong scheme, empty credential, and an empty header all fail the
+    same way — the response never reveals which part failed.
+    """
+    for header in (
+        "Basic dXNlcjpwYXNz",
+        "Bearer",
+        "Bearer   ",
+        "Token not-the-panel-token",
+        "",
+    ):
+        response = await panel_client.get(
+            "/api/v1/panel/snapshot",
+            headers={"Authorization": header},
+        )
+        assert response.status_code == 401, f"header {header!r} passed"
+
+
+# --- snapshot payload ----------------------------------------------------
+
+
+async def test_valid_token_returns_full_snapshot(
+    seeded_panel: SimpleNamespace,
+) -> None:
+    """The correct token returns 200 with the documented snapshot shape.
+
+    Children in sort order (Ada sort_order 0, Bo 1); per-child counts,
+    presence, next_present, and cycle day all asserted as explicit
+    literals; each child's instances are in the documented panel
+    payload shape (done -> completed spelling, on_time passthrough).
+    """
+    seed = seeded_panel.seed
+    response = await seeded_panel.client.get(
+        "/api/v1/panel/snapshot",
+        headers={"Authorization": f"Bearer {PANEL_TOKEN}"},
+    )
+    assert response.status_code == 200
+    body = response.json()
+
+    assert body["today_iso"] == seeded_panel.today.isoformat()
+    # Ada's 2-week cycle anchored yesterday => today is cycle day 2.
+    assert body["cycle_day"] == 2
+
+    children = body["children"]
+    assert [child["child_id"] for child in children] == [
+        seed.ada.id,
+        seed.bo.id,
+    ], "children appear in sort_order"
+
+    ada, bo = children
+
+    # Ada: away today, returns on the override date; her 10:00 quest
+    # is open and overdue at the pinned 12:00.
+    assert ada["child_name"] == "Ada"
+    assert ada["present"] is False
+    assert ada["next_present"] == seed.returns_date.isoformat()
+    assert ada["due_today"] == 1
+    assert ada["completed_today"] == 0
+    assert ada["remaining_today"] == 1
+    assert ada["completion_pct"] == 0
+    assert ada["instances"] == [
+        {
+            "id": seed.pack_bag_instance.id,
+            "definition_id": seed.pack_bag_instance.definition_id,
+            "child_id": seed.ada.id,
+            "title": "Pack bag",
+            "icon": None,
+            "window": "morning",
+            "due_time": "10:00",
+            "state": "open",
+            "overdue": True,
+            "completed_at": None,
+            "on_time": None,
+        }
+    ]
+
+    # Bo: present, completed his 17:00 quest at the pinned 12:00
+    # (on time), so the panel spelling is "completed".
+    assert bo["child_name"] == "Bo"
+    assert bo["present"] is True
+    assert bo["next_present"] is None
+    assert bo["due_today"] == 1
+    assert bo["completed_today"] == 1
+    assert bo["remaining_today"] == 0
+    assert bo["completion_pct"] == 100
+    assert bo["instances"] == [
+        {
+            "id": seed.brush_teeth_instance.id,
+            "definition_id": seed.brush_teeth_instance.definition_id,
+            "child_id": seed.bo.id,
+            "title": "Brush teeth",
+            "icon": None,
+            "window": "morning",
+            "due_time": "17:00",
+            "state": "completed",
+            "overdue": False,
+            "completed_at": seeded_panel.pinned_utc_iso,
+            "on_time": True,
+        }
+    ]
+
+
+async def test_missed_instances_are_omitted_from_panel_payload(
+    seeded_panel: SimpleNamespace,
+) -> None:
+    """A missed instance never reaches the panel payload (D-009).
+
+    The household carries a past-due OPEN instance due yesterday (the
+    state the panel reads as "missed"); it must not appear anywhere in
+    the response, and Ada's payload carries exactly her ONE today
+    instance — the past-due rows (the stale chore AND her pack bag due
+    yesterday) are both omitted rather than rendered.
+    """
+    seed = seeded_panel.seed
+    response = await seeded_panel.client.get(
+        "/api/v1/panel/snapshot",
+        headers={"Authorization": f"Bearer {PANEL_TOKEN}"},
+    )
+    assert response.status_code == 200
+    body = response.json()
+
+    payload_instances = [
+        instance
+        for child in body["children"]
+        for instance in child["instances"]
+    ]
+    assert "missed" not in [
+        instance["state"] for instance in payload_instances
+    ]
+    past_due_ids = {seed.stale_instance.id}
+    assert past_due_ids.isdisjoint(
+        instance["id"] for instance in payload_instances
+    ), "the past-due open instance leaked into the panel payload"
+
+    ada = next(
+        child
+        for child in body["children"]
+        if child["child_id"] == seed.ada.id
+    )
+    assert [instance["id"] for instance in ada["instances"]] == [
+        seed.pack_bag_instance.id
+    ]
+
+
+def test_panel_shaper_drops_missed_views() -> None:
+    """The route's shaper omits a missed view (D-009), on the app's copy.
+
+    ``instance_payload(include_missed=False)`` is what the snapshot
+    route shapes every child's instances with; exercised here on the
+    SAME core copy the app uses (the two-copy caveat makes this a
+    distinct object from the conftest-stubbed copy's identical source).
+    """
+    missed_view = core_snapshot.QuestInstanceView(
+        instance_id=999,
+        definition_id=1,
+        child_id=1,
+        title="Stale chore",
+        icon=None,
+        window="morning",
+        due_date="2026-09-21",
+        due_time="09:00",
+        state="missed",
+        overdue=False,
+        completed_at=None,
+        was_on_time=None,
+    )
+    assert core_snapshot.instance_payload(
+        [missed_view], include_missed=False
+    ) == []
+
+
+# --- route documentation -------------------------------------------------
+
+
+async def test_snapshot_route_is_documented(
+    panel_client: httpx.AsyncClient,
+) -> None:
+    """The snapshot route and its response shape are in the OpenAPI doc."""
+    response = await panel_client.get("/openapi.json")
+    assert response.status_code == 200
+    schema = response.json()
+    assert "/api/v1/panel/snapshot" in schema["paths"]
+    assert "get" in schema["paths"]["/api/v1/panel/snapshot"]
+    documented = {
+        model["title"]
+        for model in schema["components"]["schemas"].values()
+    }
+    assert "PanelSnapshotResponse" in documented
+    assert "PanelChildPayload" in documented
+    assert "PanelInstancePayload" in documented
+
+
+# --- complete route -------------------------------------------------------
+
+
+async def test_complete_writes_panel_completion(
+    seeded_panel: SimpleNamespace,
+) -> None:
+    """The first POST completes the instance as the tapped profile.
+
+    Returns success; the completion event recorded is
+    ``actor_source='panel'`` with the tapped ``actor_child_id`` and NO
+    ``actor_user_id`` (the panel actor contract), and the instance's
+    derived state becomes ``done``.
+    """
+    seed = seeded_panel.seed
+    response = await seeded_panel.client.post(
+        f"/api/v1/panel/instances/{seed.pack_bag_instance.id}/complete",
+        headers={"Authorization": f"Bearer {PANEL_TOKEN}"},
+        json={"actor_child_id": seed.ada.id},
+    )
+    assert response.status_code == 200
+    assert response.json() == {"status": "done"}
+
+    # Assert the recorded event and derived state through the SAME core
+    # copy the app uses (two-copy caveat: never mix copies), against the
+    # app's live connection.
+    events = await _events_for_instance(
+        seeded_panel.database, seed.pack_bag_instance.id
+    )
+    assert len(events) == 1
+    event = events[0]
+    assert event.event_type == "completed"
+    assert event.actor_source == "panel"
+    assert event.actor_child_id == seed.ada.id
+    assert event.actor_user_id is None
+
+    instance = await _dao_instances.QuestInstancesDao(
+        seeded_panel.database
+    ).get_by_id(seed.pack_bag_instance.id)
+    assert await _derived_state(
+        seeded_panel.database, instance, seeded_panel.today
+    ) == "done"
+
+
+async def test_complete_is_idempotent(
+    seeded_panel: SimpleNamespace,
+) -> None:
+    """A second call is a no-op that still returns success.
+
+    The core completion layer's ``appended`` flag decides: the repeat
+    call appends nothing, so exactly ONE completion event row exists
+    after two calls.
+    """
+    seed = seeded_panel.seed
+    headers = {"Authorization": f"Bearer {PANEL_TOKEN}"}
+    url = f"/api/v1/panel/instances/{seed.pack_bag_instance.id}/complete"
+    body = {"actor_child_id": seed.ada.id}
+    first = await seeded_panel.client.post(url, headers=headers, json=body)
+    assert first.status_code == 200
+    second = await seeded_panel.client.post(url, headers=headers, json=body)
+    assert second.status_code == 200
+    assert second.json() == {"status": "done"}
+
+    events = await _events_for_instance(
+        seeded_panel.database, seed.pack_bag_instance.id
+    )
+    assert len(events) == 1, (
+        "the idempotent call must not append a second event"
+    )
+
+
+async def test_complete_unknown_instance_is_not_found(
+    panel_client: httpx.AsyncClient,
+) -> None:
+    """Completing a non-existent instance returns 404."""
+    response = await panel_client.post(
+        "/api/v1/panel/instances/999999/complete",
+        headers={"Authorization": f"Bearer {PANEL_TOKEN}"},
+        json={"actor_child_id": 1},
+    )
+    assert response.status_code == 404
+
+
+async def test_complete_without_token_is_unauthorized(
+    panel_client: httpx.AsyncClient,
+) -> None:
+    """A complete request with no Authorization header returns 401."""
+    response = await panel_client.post(
+        "/api/v1/panel/instances/1/complete",
+        json={"actor_child_id": 1},
+    )
+    assert response.status_code == 401
+
+
+async def test_complete_wrong_child_is_not_found(
+    seeded_panel: SimpleNamespace,
+) -> None:
+    """Tapping the wrong child's profile answers 404, not success.
+
+    ``complete_instance`` does not itself check that the tapped
+    ``actor_child_id`` is the child the instance belongs to; the route
+    guards it so a wrong-profile tap can never complete another
+    child's quest.
+    """
+    seed = seeded_panel.seed
+    response = await seeded_panel.client.post(
+        f"/api/v1/panel/instances/{seed.pack_bag_instance.id}/complete",
+        headers={"Authorization": f"Bearer {PANEL_TOKEN}"},
+        json={"actor_child_id": seed.bo.id},
+    )
+    assert response.status_code == 404
+    # And nothing was completed.
+    events = await _events_for_instance(
+        seeded_panel.database, seed.pack_bag_instance.id
+    )
+    assert events == []
+
+
+async def test_complete_route_is_documented(
+    panel_client: httpx.AsyncClient,
+) -> None:
+    """The complete route and its request shape are in the OpenAPI doc."""
+    response = await panel_client.get("/openapi.json")
+    assert response.status_code == 200
+    schema = response.json()
+    path = "/api/v1/panel/instances/{instance_id}/complete"
+    assert path in schema["paths"]
+    assert "post" in schema["paths"][path]
+    documented = {
+        model["title"]
+        for model in schema["components"]["schemas"].values()
+    }
+    assert "PanelCompleteRequest" in documented

tests/test_core_snapshot.py

@@ -0,0 +1,306 @@
+"""Test the pure panel snapshot builder (task 9047a97b).
+
+The snapshot assembly that lived inline in the coordinator's
+``_async_update_data`` was extracted into the Home-Assistant-free
+:func:`custom_components.nestquest.core.snapshot.build_snapshot`, and
+the panel payload shaper (:func:`instance_payload`) with it.  These
+tests seed a household and assert the pure builder's output against
+EXPLICIT literal expected values — not self-equality — so the AWAY
+child's ``next_present``, a due-timed quest's ``overdue`` under a
+pinned ``now``, the custody ``cycle_day`` (> 1), and the panel payload
+dict shape (``done`` -> ``completed``, ``on_time`` passthrough, and
+``missed`` omission) are all exercised as literals.
+"""
+from __future__ import annotations
+
+import datetime
+from zoneinfo import ZoneInfo
+
+from conftest import wire_entry_to_registry
+
+from custom_components.nestquest import async_setup_entry
+from custom_components.nestquest.children import create_child
+from custom_components.nestquest.completion import complete_instance
+from custom_components.nestquest.core.snapshot import (
+    ChildDaySnapshot,
+    NestQuestSnapshot,
+    QuestInstanceView,
+    build_snapshot,
+    instance_payload,
+)
+from custom_components.nestquest.dao_instances import QuestInstancesDao
+from custom_components.nestquest.dao_presence import (
+    PresenceOverridesDao,
+    PresenceSchedulesDao,
+)
+from custom_components.nestquest.materialize import materialize
+from custom_components.nestquest.quest_definitions import create_quest_definition
+from custom_components.nestquest.recurrence import ScheduleRule
+
+
+async def test_instance_payload_shape_and_missed_omission() -> None:
+    """``instance_payload`` is the documented panel shape (§1).
+
+    ``done`` maps to ``completed``; ``open`` passes through; ``on_time``
+    is the builder's ``was_on_time`` verbatim; ``missed`` instances are
+    omitted unless ``include_missed`` (the admin payload, D-009).
+    """
+    def view(state: str, *, overdue: bool = False, on_time: bool | None = None,
+             completed_at: str | None = None, instance_id: int = 1) -> QuestInstanceView:
+        return QuestInstanceView(
+            instance_id=instance_id,
+            definition_id=10,
+            child_id=3,
+            title="Fill bird feeder",
+            icon="bird",
+            window="afternoon",
+            due_date="2026-09-21",
+            due_time="17:00",
+            state=state,
+            overdue=overdue,
+            completed_at=completed_at,
+            was_on_time=on_time,
+        )
+
+    open_view = view("open", overdue=True)
+    done_view = view("done", on_time=True, completed_at="2026-09-21T12:00:00+00:00")
+    missed_view = view("missed", instance_id=2)
+
+    panel = instance_payload([open_view, done_view, missed_view], include_missed=False)
+    assert panel == [
+        {
+            "id": 1,
+            "definition_id": 10,
+            "child_id": 3,
+            "title": "Fill bird feeder",
+            "icon": "bird",
+            "window": "afternoon",
+            "due_time": "17:00",
+            "state": "open",
+            "overdue": True,
+            "completed_at": None,
+            "on_time": None,
+        },
+        {
+            "id": 1,
+            "definition_id": 10,
+            "child_id": 3,
+            "title": "Fill bird feeder",
+            "icon": "bird",
+            "window": "afternoon",
+            "due_time": "17:00",
+            "state": "completed",
+            "overdue": False,
+            "completed_at": "2026-09-21T12:00:00+00:00",
+            "on_time": True,
+        },
+    ], "panel payload omits missed and spells done as completed"
+
+    admin = instance_payload(
+        [open_view, done_view, missed_view], include_missed=True
+    )
+    assert len(admin) == 3
+    assert admin[2]["state"] == "missed", (
+        "admin payload keeps missed instances with their missed state"
+    )
+
+
+async def test_build_snapshot_explicit_values(hass, make_entry, monkeypatch) -> None:
+    """The builder produces the documented shape as literals, pinned in time.
+
+    Ada is AWAY today (a 2-week schedule whose absent week 0 covers today,
+    plus a presence override marking her present on today+2) so
+    ``present`` is False and ``next_present`` is the override date.  Her
+    open quest due at 10:00 is OVERDUE under the pinned 12:00 ``now``.
+    Bo's quest due at 17:00 is completed at 12:00 (on time) so its
+    payload ``state`` is ``completed`` and ``on_time`` is True.  The first
+    scheduled active child is Ada, whose 2-week cycle anchored one day
+    before today puts ``cycle_day`` at 2.
+    """
+    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
+    settings = entry.runtime_data.settings
+
+    # Single clock read for the seed/snapshot anchor (no midnight skew).
+    today = coordinator._local_now().date()
+    time_zone = ZoneInfo(hass.config.time_zone)
+    # 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(
+        today.year, today.month, today.day, 12, 0, 0, tzinfo=time_zone
+    )
+    today_iso = today.isoformat()
+
+    ada = await create_child(database, "Ada")
+    bo = await create_child(database, "Bo")
+
+    await create_quest_definition(
+        database,
+        "Pack bag",
+        ScheduleRule.from_dict(
+            {"rule_type": "daily", "start_date": today_iso}
+        ),
+        [ada.id],
+        [("morning", "10:00")],
+    )
+    await create_quest_definition(
+        database,
+        "Brush teeth",
+        ScheduleRule.from_dict(
+            {"rule_type": "daily", "start_date": today_iso}
+        ),
+        [bo.id],
+        [("morning", "17:00")],
+    )
+    end = (today + datetime.timedelta(days=3)).isoformat()
+    await materialize(database, today_iso, end, today=today)
+
+    # Ada: 2-week cycle anchored yesterday. Week 0 (the empty segment)
+    # covers today, so she is absent today; an override marks her present
+    # on today+2, so next_present resolves to that date and cycle_day is
+    # ((today - (today-1)) % 14) + 1 == 2.
+    await PresenceSchedulesDao(database).upsert_by_child(
+        ada.id,
+        cycle_length_weeks=2,
+        anchor_date=(today - datetime.timedelta(days=1)).isoformat(),
+        pattern="|0,1,2,3,4,5,6",
+    )
+    returns_date = today + datetime.timedelta(days=2)
+    await PresenceOverridesDao(database).create(
+        ada.id,
+        returns_date.isoformat(),
+        returns_date.isoformat(),
+        is_present=True,
+        note="visit",
+    )
+
+    # Complete Bo's instance at the pinned 12:00 (17:00 due => on time).
+    bo_instances = await QuestInstancesDao(database).list_by_child_and_date(
+        bo.id, today_iso
+    )
+    await complete_instance(
+        database,
+        bo_instances[0].id,
+        actor_source="panel",
+        actor_child_id=bo.id,
+        now=pinned_now,
+        today=today,
+    )
+
+    built = await build_snapshot(database, settings, pinned_now)
+
+    assert isinstance(built, NestQuestSnapshot)
+    assert built.today_iso == today_iso
+    assert built.cycle_day == 2, (
+        "Ada's 2-week cycle anchored yesterday => day 2 today"
+    )
+
+    by_id = {child.child_id: child for child in built.children}
+    assert list(by_id) == [ada.id, bo.id], (
+        "active children appear in sort_order, id order"
+    )
+    ada_child = by_id[ada.id]
+    bo_child = by_id[bo.id]
+
+    # Ada: away today, returns on the override date, one open+overdue quest.
+    assert isinstance(ada_child, ChildDaySnapshot)
+    assert ada_child.present is False
+    assert ada_child.next_present == returns_date.isoformat()
+    assert ada_child.due_today == 1
+    assert ada_child.completed_today == 0
+    assert ada_child.remaining_today == 1
+    assert ada_child.completion_pct == 0
+    ada_view = ada_child.instances[0]
+    assert isinstance(ada_view, QuestInstanceView)
+    assert ada_view.state == "open"
+    assert ada_view.due_time == "10:00"
+    assert ada_view.overdue is True, "12:00 now is past the 10:00 due time"
+    assert ada_view.completed_at is None
+    assert ada_view.was_on_time is None
+
+    # Bo: present, one completed instance, on time, not overdue.
+    assert bo_child.present is True
+    assert bo_child.next_present is None
+    assert bo_child.due_today == 1
+    assert bo_child.completed_today == 1
+    assert bo_child.remaining_today == 0
+    assert bo_child.completion_pct == 100
+    bo_view = bo_child.instances[0]
+    assert bo_view.state == "done"
+    assert bo_view.due_time == "17:00"
+    assert bo_view.overdue is False, "overdue is only computed for open state"
+    assert bo_view.completed_at == pinned_now.astimezone(
+        datetime.timezone.utc
+    ).isoformat()
+    assert bo_view.was_on_time is True
+
+    # Panel payload shape: Ada open+overdue stays open; Bo done -> completed.
+    ada_payload = instance_payload(ada_child.instances, include_missed=False)
+    assert ada_payload == [
+        {
+            "id": ada_view.instance_id,
+            "definition_id": ada_view.definition_id,
+            "child_id": ada.id,
+            "title": "Pack bag",
+            "icon": None,
+            "window": "morning",
+            "due_time": "10:00",
+            "state": "open",
+            "overdue": True,
+            "completed_at": None,
+            "on_time": None,
+        }
+    ]
+    bo_payload = instance_payload(bo_child.instances, include_missed=False)
+    assert bo_payload == [
+        {
+            "id": bo_view.instance_id,
+            "definition_id": bo_view.definition_id,
+            "child_id": bo.id,
+            "title": "Brush teeth",
+            "icon": None,
+            "window": "morning",
+            "due_time": "17:00",
+            "state": "completed",
+            "overdue": False,
+            "completed_at": pinned_now.astimezone(
+                datetime.timezone.utc
+            ).isoformat(),
+            "on_time": True,
+        }
+    ]
+
+    # Missed omission is real: a missed view is dropped from the panel
+    # payload and kept in the admin payload with its missed state.
+    missed_view = QuestInstanceView(
+        instance_id=999,
+        definition_id=10,
+        child_id=ada.id,
+        title="Stale quest",
+        icon=None,
+        window="morning",
+        due_date=(today - datetime.timedelta(days=1)).isoformat(),
+        due_time="09:00",
+        state="missed",
+        overdue=False,
+        completed_at=None,
+        was_on_time=None,
+    )
+    assert instance_payload([missed_view], include_missed=False) == []
+    assert (
+        instance_payload([missed_view], include_missed=True)[0]["state"]
+        == "missed"
+    )
+
+    # REQUIRED wrapper tie-in: the coordinator's _async_update_data is a
+    # thin WRAPPER over build_snapshot, so pinning its clock to the SAME
+    # pinned_now the builder was called with must reproduce the builder's
+    # snapshot byte-for-byte.  The dataclasses are frozen, so == is a full
+    # deep compare — a wrapper that mis-passed today vs now, or stopped
+    # calling the builder, would diverge here even though the literal
+    # assertions above still pass.
+    monkeypatch.setattr(coordinator, "_local_now", lambda: pinned_now)
+    await coordinator.async_refresh()
+    assert coordinator.data == built

tests/test_entity_matrix.py

@@ -186,18 +186,18 @@ async def test_entity_and_event_matrix(hass, make_entry) -> None:
     original_refresh = coordinator._async_update_data
 
     async def _future_dated_refresh():
-        import custom_components.nestquest.coordinator as coordinator_module
+        import custom_components.nestquest.core.snapshot as snapshot_module
 
-        real_derive = coordinator_module.derive_state
+        real_derive = snapshot_module.derive_state
 
         def _derive(instance, latest, today):
             return real_derive(instance, latest, today + datetime.timedelta(days=1))
 
-        coordinator_module.derive_state = _derive
+        snapshot_module.derive_state = _derive
         try:
             return await original_refresh()
         finally:
-            coordinator_module.derive_state = real_derive
+            snapshot_module.derive_state = real_derive
 
     coordinator._async_update_data = _future_dated_refresh
     await coordinator.async_refresh()

tests/test_sensors.py

@@ -238,16 +238,16 @@ async def test_due_today_payload_omits_missed_for_panel_includes_for_admin(
     entry, coordinator, (ada, bo, cory) = await _setup_seeded_entry(
         hass, make_entry
     )
-    import custom_components.nestquest.coordinator as coordinator_module
+    import custom_components.nestquest.core.snapshot as snapshot_module
 
     tomorrow = _today() + datetime.timedelta(days=1)
-    real_derive_state = coordinator_module.derive_state
+    real_derive_state = snapshot_module.derive_state
 
     def _derive_against_pinned_future(instance, latest, today):
         return real_derive_state(instance, latest, tomorrow)
 
     monkeypatch.setattr(
-        coordinator_module, "derive_state", _derive_against_pinned_future
+        snapshot_module, "derive_state", _derive_against_pinned_future
     )
     await coordinator.async_refresh()
 

uv.lock

@@ -2,6 +2,55 @@ version = 1
 revision = 3
 requires-python = ">=3.11"
 
+[[package]]
+name = "annotated-doc"
+version = "0.0.5"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/5a/8e/38aa427ed5402449e226975b649c5dc73ccadfefeb95e6aecb8f8ea4b6b6/annotated_doc-0.0.5.tar.gz", hash = "sha256:c7e58ce09192557605d8bbd92836d7e1d520ac9580096042c0bfd197efacf1bb", size = 10758, upload-time = "2026-07-28T13:50:58.129Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/3e/30/e900b21425a860e195f32e37657aa1f7c7f2b1bfb26f03ca209b90933c06/annotated_doc-0.0.5-py3-none-any.whl", hash = "sha256:117bac03a25ede5df5440e855b32d556049ca169ead221505badf432fed4b101", size = 5302, upload-time = "2026-07-28T13:50:57.239Z" },
+]
+
+[[package]]
+name = "annotated-types"
+version = "0.8.0"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/5f/56/a8120250d128bed162cd73c76d45f6ef9991f3e068f62a8ee060afa3104a/annotated_types-0.8.0.tar.gz", hash = "sha256:13b2beaad985e05e2d6407ee4c4f35590b11f8d693a258a561055cac8f64cab7", size = 15893, upload-time = "2026-07-23T20:16:13.995Z" }
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+]
+
+[[package]]
+name = "anyio"
+version = "4.15.1"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "idna" },
+    { name = "typing-extensions", marker = "python_full_version < '3.15'" },
+]
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+]
+
+[[package]]
+name = "certifi"
+version = "2026.7.22"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/a3/c2/24167ea9858356b47a87a50d39908bfdb72ceeefe0041586e704e5376b3a/certifi-2026.7.22.tar.gz", hash = "sha256:741e2c3b351ddf169a738da9f2c048608ff7f2c5cc02f1ebc6b118bb090d5d55", size = 138112, upload-time = "2026-07-22T03:35:12.644Z" }
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+]
+
+[[package]]
+name = "click"
+version = "8.5.0"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/c7/0e/7fa0ef50764b67090eca4114772a2abf8b6148198475e54c660b97caeee6/click-8.5.0.tar.gz", hash = "sha256:ba0d2089de75ea0310e2dde03160e6ca10009947fb95a182f9b54021bb272e34", size = 382235, upload-time = "2026-08-26T13:33:14.56Z" }
+wheels = [
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+]
+
 [[package]]
 name = "colorama"
 version = "0.4.6"
@@ -11,6 +60,68 @@ wheels = [
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 ]
 
+[[package]]
+name = "fastapi"
+version = "0.141.1"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "annotated-doc" },
+    { name = "pydantic" },
+    { name = "starlette" },
+    { name = "typing-extensions" },
+    { name = "typing-inspection" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/8a/02/91e3416a8fdd715abb903a952a6bec7cdd8d14eed55d415fc8595524c319/fastapi-0.141.1.tar.gz", hash = "sha256:e8822fc40db1e1858054d7a949a888695bc9bdce70139178e33bd2871a453ca1", size = 425799, upload-time = "2026-07-29T17:18:05.568Z" }
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+dependencies = [
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+[[package]]
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+version = "0.28.1"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "anyio" },
+    { name = "certifi" },
+    { name = "httpcore" },
+    { name = "idna" },
+]
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+]
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+[[package]]
+name = "idna"
+version = "3.20"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/f5/08/8eea9d4b8302028f3abb2c0813953f7aec26d33b7a8960ed760e65ff29fa/idna-3.20.tar.gz", hash = "sha256:a7db850025b95ded1eae8a46181a1a6c56c92c96f0e2b005d9ff8dc0210cab44", size = 216463, upload-time = "2026-09-17T14:11:04.752Z" }
+wheels = [
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+]
+
 [[package]]
 name = "iniconfig"
 version = "2.3.0"
@@ -113,10 +224,13 @@ source = { virtual = "." }
 
 [package.dev-dependencies]
 dev = [
+    { name = "fastapi" },
+    { name = "httpx" },
     { name = "jinja2" },
     { name = "pytest" },
     { name = "pytest-asyncio" },
     { name = "pyyaml" },
+    { name = "uvicorn" },
     { name = "voluptuous" },
 ]
 
@@ -124,10 +238,13 @@ dev = [
 
 [package.metadata.requires-dev]
 dev = [
+    { name = "fastapi", specifier = ">=0.115" },
+    { name = "httpx", specifier = ">=0.28" },
     { name = "jinja2", specifier = ">=3" },
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