go-event-publisher

The transactional outbox pattern solves the dual-write problem by ensuring state changes and event recording are atomic within a single PostgreSQL transaction, preventing silent event loss if a service crashes before publishing to Kafka.

You can implement reliable event publishing by using a supervised, polling-based relay that reads events from a PostgreSQL outbox and guarantees at-least-once delivery to Redpanda or Kafka.

Idempotent event processing ensures that even if a relay publishes the same event multiple times due to at-least-once delivery guarantees, downstream consumers process the message only once, preventing duplicate side effects.

Yes, the transactional outbox pattern supports memory-bounded batching and backpressure management, making it suitable for high-throughput microservices requiring strict consistency between database state and downstream systems.

You should use a transactional outbox when building microservices that require strict consistency, such as order processing or financial ledger updates, to avoid silent event loss during system failures.