When Workflows Fail at 3 AM: Designing Dead-Letter Queues and Auto-Rollback in n8n

What happens when a downstream third-party CRM API drops connection halfway through a 7-step automation? Here is how to architect Dead-Letter Queues (DLQ), idempotency keys, and automated rollback handlers in n8n.

Written and maintained by Hassan Nazir, Forward Deployed Engineer and Applied AI practitioner.