Worked on the apache/seatunnel repository to address a critical issue in the SQLite dialect, focusing on improving the reliability of upsert operations. Corrected the upsert statement to use the proper EXCLUDED syntax, ensuring data integrity during database operations. Enhanced the solution by expanding unit test coverage, validating various upsert scenarios and edge cases to reduce the risk of regression in production environments. Utilized Java and SQL to implement and verify these changes, emphasizing robust unit testing practices. This targeted bug fix reinforced the stability of sqlite-based upserts in Seatunnel, contributing to safer and more predictable data handling workflows.