CQRS and Event Sourcing Patterns Expert guidance for implementing Command Query Responsibility Segregation (CQRS) and Event Sourcing patterns to build scalable, auditable systems with complete historical tracking and optimized read/write models. When to Use This Skill - Building systems requiring complete audit trails and compliance - Implementing temporal queries ("show me the state at time T") - Designing high-scale applications with complex domain logic - Creating systems with significantly different read and write patterns - Building event-driven architectures with historical replay capab…