Implements the backend half of the ESP32-P4 sensor node spec's pairing,
ingestion, and live-broadcast contract:
- New Device model (backend/app/models/device.py): id, user_id FK, name,
token_hash (unique+indexed), created_at, last_seen_at. Reuses
generate_session_token()/hash_token() from auth_session.py verbatim for
the one-time raw pairing token / stored hash.
- POST /api/device, GET /api/device (session-cookie authenticated REST
pairing endpoints) and POST /api/device/telemetry (device bearer-token
authenticated ingestion, per-device rate limited, 16KB body cap, 64
reading cap, strict shape validation — never a 500 on garbage input) in
backend/app/routes/device.py.
- /ws/device-feed live dashboard WS (qm_session cookie authenticated),
fanning out ingested readings to the owning user's connected dashboard
sockets via an in-process dict[user_id, connections] registry, each with
its own send-queue + single sender task (mirrors app.ws's
SeanceState/_sender convention).
- last_seen_at updates on every successful ingestion.
- _process_reading(device, reading) left as an explicit no-op handoff point
for Workstream K's summon-pipeline integration.
Backend suite: 102 passed.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
