Extends Dispatcher with the v1.1.9 queue path. The queue table IS the
outbox for queue semantics, so the dispatcher polls queue_messages
directly via FOR UPDATE SKIP LOCKED — no outbox indirection.
Per tick (every 100ms):
1) outbox arm — unchanged
2) queue arm: list_active_queue_consumers() → per (app_id, queue_name)
attempt one claim. Bounded by registered-consumer count so one busy
queue can't starve others.
Per claimed message:
- Build TriggerEvent::Queue + ExecRequest (executes as the trigger's
registering principal, matching design notes §4)
- dispatch through executor.execute_with_identity (reuses AST cache)
- success → queue.ack(id, claim_token) — DELETE WHERE id AND token
- throw + attempt < max_attempts → queue.nack(...) — clear claim, set
deliver_after = NOW() + compute_backoff(attempt, backoff, base_ms, jitter)
- throw + exhausted → queue.dead_letter(...) atomic move to dead_letters
+ DELETE in one transaction. fan_out_dead_letter on the outbox arm
fires registered dead_letter handlers off the new row without changes.
Visibility-timeout reclaim task: separate tokio::spawn ticking on
queue_reclaim_interval_ms (default 30000). UPDATE clears claim_token /
claimed_at on rows whose claimed_at exceeds the per-queue
visibility_timeout_secs (joined from queue_trigger_details). A crashed
consumer thus loses its lease and the message becomes claimable again.
Dispatcher gains queue: Arc<dyn QueueRepo>; picloud/lib.rs threads
queue_repo.clone() into the construction.
ActiveQueueConsumer extended with app_id so the queue claim can be
performed without a follow-up trigger lookup; list_active_queue_consumers
SQL extended to SELECT t.app_id.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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