During December 2024, Sun Xiaojian developed a versioned merge engine for primary key tables in the luoyuxia/fluss repository, focusing on backend development and distributed systems using Java. The engine introduced a version-based update rule, ensuring that data is only updated when the incoming version exceeds the existing one, which preserves data integrity and reduces unnecessary writes. Sun implemented the core merge logic and integrated it with the existing key-value merge workflow, while also adding comprehensive tests to validate version comparisons and edge cases. This work established a robust foundation for future merge strategies and enhanced configurability within the system.