- rivermigrate at startup (idempotent, before client construction)
- S3 store init from env vars (S3_ENDPOINT/S3_BUCKET/S3_ACCESS_KEY/S3_SECRET_KEY/S3_REGION/S3_USE_PATH_STYLE)
- signal.NotifyContext created AFTER all startup I/O (PATTERNS.md critical ordering)
- HeartbeatWorker + OrphanCleanupWorker registered via river.AddWorker
- river.Client with slog.Default() Logger, SlogErrorHandler, MaxWorkers:10
- HeartbeatArgs periodic every 1 min (RunOnStart:true), OrphanCleanupArgs every 1 hr
- StopAndCancel(10s timeout) on shutdown; pool.Close after StopAndCancel
- Opens pgxpool from DATABASE_URL, logs 'worker ready', blocks on
SIGINT/SIGTERM, closes pool, exits 0
- Reuses web.NewSlogHandler — pure helper, no HTTP coupling
- No job queue libraries (river/asynq/pg_notify) — Phase 6 replaces this
file in full
- 48 lines (under 80-line budget signals 'we did not implement Phase 6
by accident')
