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On December 12, 2023, the event sourcing and CQRS framework "Sekiban," which uses document databases such as Azure Cosmos DB as an event store, was developed with support from Microsoft's startup support program "Microsoft for Startups" and released as open-source software. ■ Typical Business Benefits of "Event Sourcing" 1. Increased Data Value - All data is recorded in event format: Facilitates the utilization of data for various purposes. 2. Improved Data Reliability - Recorded data cannot be changed or deleted: Provides traceability and reduces the risk of information tampering. 3. Enhanced System Quality and Maintainability - Any past state can be reproduced: Makes it easier to identify the situation and cause when problems occur. ■ Development Benefits of Using "Sekiban" - Enables easy implementation of commands, events, projections, tests, and queries, allowing developers to focus on critical business logic.

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