Milan Jovanović • 4/4/2026

Implementing the Inbox Pattern for Reliable Message Consumption

This article covers the Inbox pattern, the counterpart to the Outbox pattern, ensuring exactly-once message consumption even with at-least-once delivery from brokers. It describes common failure scenarios, the need for an inbox table with idempotent inserts, a database schema example using PostgreSQL, and a background processing approach. It also compares the Inbox pattern with idempotent consumers, providing a technical guide for developers building reliable distributed systems.

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#déduplication #Inbox Pattern #Message Consumption