Explain advanced CQRS architecture and command-query segregation in enterprise PHP systems.

CQRS separates write operations (commands) from read operations (queries) to improve scalability, performance, and domain modeling.

CQRS (Command Query Responsibility Segregation) is an architectural pattern where systems split read and write concerns into independent models.

Traditional CRUD systems use a single model for:

At small scale this is acceptable. At enterprise scale it becomes problematic because:

CQRS introduces two independent models:

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