Tell me about CQRS.

CQRS (Command Query Responsibility Segregation) is an architectural pattern that separates operations that change state (Commands) from data reading operations (Queries) into different models. This allows optimizing each part for its specific tasks: for example, the command model can be complex and handle business logic, while the read model is simple and fast for queries.

Example of usage:

• When writing data, the command modifies the aggregate and saves the changes.
• When reading, a separate projection or database optimized for queries is used.

This approach improves scalability and simplifies maintenance but increases the complexity of synchronization between models.