Composable Rust Event Sourcing Expert

Expert knowledge for implementing event sourcing patterns in Composable Rust - event store design, state reconstruction, version tracking, PostgreSQL integration, and CQRS patterns.

When to Use This Skill

Automatically apply when:

• Implementing event-sourced aggregates
• Working with EventStore trait or PostgreSQL event store
• Designing event schemas or event types
• Implementing state reconstruction from events
• Dealing with optimistic concurrency or version tracking
• Questions about event sourcing, CQRS, or persistence

Event Sourcing Fundamentals

Core Principle

State is derived from events, not stored directly.