Events

Producers write event_outbox in the same database transaction as the business change. outbox-relay-service publishes the envelope to Redis Streams. Consumers append to inbox_messages and let InboxMessageWorker run the handler. Handlers must be idempotent on event_id.

Produced

• No business outbox. Delivery status is stored locally and updated from webhooks.

Consumed

• splick.streams.auth.user-welcome-email group communication-service.user-welcome-email into WelcomeEmailInboxHandler.

Envelope fields that matter for operations: eventId, type, traceId (from X-Request-Id). See request correlation.