composable-rust-event-sourcing

To implement event sourcing in Rust with PostgreSQL persistence, you design an EventStore trait, wire it to a transaction-based PostgreSQL database, and use bincode for event serialization. This enables immutable event storage and state reconstruction.

State reconstruction from event streams works by applying immutable events sequentially to rebuild current domain state. You use methods like from_events and load to replay the stream, optionally utilizing snapshot strategies to optimize the reconstruction process.

You handle optimistic concurrency in a Rust event store by tracking event versions during batched appends. The transaction-based PostgreSQL event store enforces version tracking, ensuring concurrent writes do not corrupt the immutable event stream.

The best way to build CQRS projections in Rust is to create idempotent projections that update read models from event streams. This approach ensures forward-compatible event schemas and prevents duplicate updates when replaying events.

Yes, you need bincode to serialize events in this Rust event sourcing system. The implementation specifically relies on bincode for serializing and deserializing immutable events persisted in the PostgreSQL transaction-based event store.