How does Rails handle large-scale system design using event-driven CQRS architecture?

CQRS separates read and write models while event-driven systems propagate changes asynchronously.

CQRS (Command Query Responsibility Segregation) separates write operations (commands) from read operations (queries). Rails uses events to update read models asynchronously, improving scalability and performance. Write models handle business logic, while read models are optimized projections. Event streams ensure synchronization between the two sides.