Operations
Dead letter queue (DLQ)
A dead letter queue is the storage for messages that failed processing after all retries exhausted. Lets you inspect, debug, and replay failures without blocking the main queue. Essential for any async workflow processing real volume.
More detail
Tools: AWS SQS native DLQ, Inngest Functions, Trigger.dev, Hatchet. For SMB scale with n8n: a Supabase table named workflow_failures storing {workflow, payload, error, attempts, last_attempted_at}. The /studio Tasks tab pulls from this table for human review.