Gabriel Radureau 799e10dcc2 Phase 2b — durable Postgres queue + worker (gated on DATABASE_URL) ...

Adds the async dispatch infrastructure :

- Postgres pool + embedded migration (CREATE TABLE/INDEX IF NOT EXISTS
  gateway_jobs). Auto-applied at boot. lib/pq driver (matches webapp
  convention).
- queue.go : Enqueue (idempotent on UNIQUE(bot_slug, update_id) — handles
  Telegram redelivery), Pop with FOR UPDATE SKIP LOCKED, MarkDone,
  MarkFailed with exponential backoff (30s → 2m → 10m → 1h → dead at 5).
- worker.go : goroutine that drains the queue, dispatches via the same
  Handler interface as sync, schedules retries on failure, notifies the
  user once when a job goes to dead.
- BotConfig gains `async: bool`. Registry refuses bots with async=true
  if DATABASE_URL is unset (queue=nil).
- Server : when bot.Async, the webhook ack is immediate ; the update
  payload is enqueued for the worker.

When DATABASE_URL is unset (current default), queue/worker stay disabled
and only sync handlers (echo, http, auth) work — no breaking change to
the running cluster.

Refs ~/.claude/plans/pour-les-notifications-on-inherited-seal.md § Phase 2.

2026-05-09 14:38:41 +02:00

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