[ugoocreates-pixel]

Summary

Enforces the consistency rule for webhook dead letters across handler responses, worker transitions, operator requeue workflows, and monitoring documentation as defined in SSB-2026-158.

Key Changes

1. Committed State Reflection & Delivery ID Consistency:

   • In backend/src/services/webhook.ts, requeueDeadLetter captures the newly generated delivery ID from SQLite's lastInsertRowid upon successfully committing the restored delivery, emitting structured outcome signals with deliveryId.
   • In backend/src/services/webhookWorker.ts, dead-letter storage transition executes atomically within a single db.transaction(...), preserving the original deliveryId and ensuring the terminal failureReason matches between stored dead letters and structured outcome logs.

2. No Claimed State Changes on Failure:

   • Worker crashes, restarts, or transaction aborts during dead-letter transition roll back cleanly, ensuring active deliveries remain pending without creating partial or duplicate dead-letter rows.
   • Non-existent dead letters or database aborts during requeue return false without claiming a state change or mutating stored records.

3. Tests & Documentation:

   • Added unit and consistency tests in backend/src/services/webhook.test.ts and backend/src/services/webhookWorker.test.ts verifying delivery ID retention, consistent failure reasons, and error boundary safety.
   • Formally documented the dead letter consistency rule in docs/webhook-monitoring.md.

Project area: backend · Batch ID: SSB-2026-158

Closes #1101

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