Worked on the apache/gravitino repository to enhance backend reliability by addressing a critical update conflict bug in the FilesetMetaService. Focused on Java-based backend development, the work involved implementing explicit row-count validation during metadata updates to prevent silent failures and ensure data integrity. Expanded unit testing coverage by introducing targeted tests that verify proper error handling when update conflicts occur, ensuring that operations fail visibly rather than succeeding incorrectly. Refined session utility usage to improve optimistic locking and precise update outcome reporting. These changes, delivered without altering user-facing APIs, strengthened the operational correctness of fileset metadata updates and reduced potential inconsistencies.