Logistics Reservation Expiry: Exponential Backoff Retries for Delayed Queue Messages

A Node.js reservation system uses a main queue with a dead‑letter queue (DLQ) to handle rate‑limited API calls that expire. Workers cap concurrency to the upstream limit, back off exponentially, and move failed reservations to the DLQ, preserving inventory and providing a clear recovery path. This design keeps poison messages away from fresh work while allowing operators to redrive after the dependency is healthy.