Android: a gated DiagnosticsReporter taps connectivity, server-health,
UPnP drops/player-state/route, power (Doze/battery-opt/screen), and
app fg/bg, plus a heartbeat snapshotting Sonos-vs-local position — the
locked-phone desync signal. Events buffer in a Room ring buffer
(deliberately NOT the MutationQueue: high-volume best-effort telemetry
that must survive the dead zone being debugged) and DiagnosticsUploader
drains them on a tick / health-recovery / sign-in.
Gating: the account flag (users.debug_mode_enabled) reaches the device
via a new /api/me refresh in AuthController; a per-device local OFF
switch lives in Settings. Reporter runs only when enabled && !optOut;
disabling drops the unsent buffer.
Web admin: /admin/diagnostics — pick account+device+kind+time-window,
see a chronological timeline, flip an account's debug mode remotely, and
Copy-JSON / Download-NDJSON the slice for analysis.
Room schema 6→7 (new diagnostic_events table + auth_session.diagnosticsOptOut;
pre-v1 destructive fallback).
Refs Scribe M9 (#119), tasks #1174#1175#1176#1177.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01K55iTxn95BtshocgdE1shW
