schema_version: 1
decision:
  id: dead-letter-queue
  title: Failed events go to a dead-letter queue, never dropped
  status: accepted
  date: 2026-09-24
  elements: [router, dlq, ops]
  diagrams: [0200-containers/platform.archify, 0300-components/router.archify]
context: >
  Events that failed schema validation were logged and lost.
  Nobody noticed until a customer asked where an order went.
decision: >
  The router moves every event it cannot process to a
  dead-letter queue with the reason. Operations replays
  them after the cause is fixed.
consequences: >
  Nothing is lost silently. Someone has to watch the queue;
  that is an on-call duty for operations.