Postgres engine: queues — Queue (validated constructor over the handle's QueueOpts stamps), the FOR UPDATE SKIP LOCKED claim (one statement, the pre-claim exhausted-reclaimable sweep in the atomic claim frame), JobHandle (one-shot ack/retry/fail in tx frames under the uniform validity predicate, absolute-reset heartbeat, engine-side equal-jitter backoff), dead-letter moves transactional (the #133 class excluded), worker-less ack_batch, unconditional cancel, dead-visible get_job, both-states+retention sweep, best-effort queue-channel wake, wake-driven claim loop pinned (task pg-engine-queues)
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