queue-processing-patterns

# Queue Processing Patterns ## Purpose Design safe queue consumers and retries. ## Inputs to request - Queue system and delivery semantics. - Idempotency requirements. - Failure modes and retry limits. ## Workflow 1. Define idempotency and retry policy. 2. Set visibility timeout and dead-letter routing. 3. Add metrics for lag and failure rates. ## Output - Queue handling checklist. ## Quality bar - Ensure retries do not amplify failures. - Document poison message handling.