cqrs-implementation

Separate read and write models with command and query buses for scalable, event-driven architectures. Comprehensive guide to implementing CQRS (Command Query Responsibility Segregation) patterns. - Provides command and query handler infrastructure with bus patterns for dispatching operations to appropriate handlers - Includes templates for command validation, event persistence, read model projections, and FastAPI integration - Supports eventual consistency patterns with checkpoint-based synchronization and read-your-writes consistency helpers - Covers event sourcing fundamentals, aggregate design, and projection rebuilding for maintaining denormalized read models - Separating read and write concerns - Scaling reads independently from writes - Building event-sourced systems - Optimizing complex query scenarios - Different read/write data models needed - High-performance reporting requirements - Separate command and query models - Different needs - Use eventual consistency - Accept propagation delay - Validate in command handlers - Before state change - Denormalize read models - Optimize for queries - Version your events - For schema evolution - Don't query in commands - Use only for writes - Don't couple read/write schemas - Independent evolution - Don't over-engineer - Start simple - Don't ignore consistency SLAs - Define acceptable lag