Backends

goes is backend-agnostic. Your application code uses interfaces (event.Store, event.Bus), and you plug in concrete implementations at startup.

Available Backends

Component	Backend	Package
Event Store	MongoDB	backend/mongo
Event Store	PostgreSQL	backend/postgres
Event Store	In-Memory	event/eventstore
Event Bus	NATS	backend/nats
Event Bus	In-Memory	event/eventbus
Snapshot Store	MongoDB	backend/mongo
Model Repository	MongoDB	backend/mongo
Model Repository	In-Memory	backend/memory

Choosing a Backend

For development and testing: Use the in-memory event store and bus. No external dependencies, instant setup.

For production: Use MongoDB or PostgreSQL for the event store (persistent, queryable) and NATS for the event bus (distributed, reliable).

Backend Guides

• MongoDB — event store, snapshot store, model repository
• PostgreSQL — event store
• NATS — event bus with Core and JetStream
• In-Memory — for testing and prototyping