Messaging and Outbox

Summary

Aggregate events map to shared contracts during save; state and outbox commit together. Hosted relay publishes eligible messages and records outcomes. Requests do not wait for publication. Delivery is at-least-once-oriented, never exactly once.

Audience

Backend and frontend developers, QA, architects, DevOps, support, and new engineers.

Source References

• microservices/src/expense-service/Messaging/OutboxRelayHostedService.cs

Related Articles

• Technical overview
• Business documentation

See Also

• Expense module

Keywords

• Expense technical
• Messaging/OutboxRelayHostedService.cs

Revision Information

• Status: Draft
• Last reviewed: 2026-07-16
• Review cycle: Quarterly