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OPERATIONS & QUEUESFZM2026-08-245 min read

Transactional Outbox Pattern: Guaranteed Event Delivery Without Loss

Dual-writes lead to inconsistency. Here is how FZM implements the Transactional Outbox pattern.

1. The Dual-Write Problem Writing to database and publishing to queue as separate operations causes state drift upon partial failures.

2. Outbox Table in ACID Transaction Events are persisted into `outbox_events` within the same PostgreSQL ACID boundary.

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