
Worked on the apache/seatunnel repository to enhance the reliability and correctness of the JDBC connector, specifically addressing upsert conflict handling in the PostgreSQL Sink Connector. Focused on ensuring that unique key fields are no longer updated during upsert conflicts, thereby preserving data integrity and preventing accidental modification of primary or unique keys. Utilized Java and SQL to implement the fix and added a regression test to verify the new behavior, following a test-driven development approach. This work improved production safety for PostgreSQL sink pipelines and demonstrated skills in connector development, database management, integration testing, and code review processes.
May 2025 — Performance highlights for apache/seatunnel (repo: apache/seatunnel). Focus: reliability, correctness, and test coverage in the JDBC connector. Delivered a critical correction to the PostgreSQL Sink Connector: on conflict during upsert, unique key fields are no longer updated; only non-unique fields are updated. This prevents accidental modification of primary/unique keys and preserves data integrity in sink operations. Implemented a regression test to verify the corrected behavior. The change was recorded under commit d0c1de83576b7f79608c2d99a58ffb5657df3ac0 with message [Fix][Connector-jdbc] Fix postgresql sink trying to update unique key (#9293) (#9298). Impact: lowers production risk, improves correctness across upserts, and strengthens trust in Seatunnel's data pipelines for PostgreSQL sinks. Technologies demonstrated: Java, JDBC connector development, PostgreSQL, test-driven development, code review, and integration testing.
May 2025 — Performance highlights for apache/seatunnel (repo: apache/seatunnel). Focus: reliability, correctness, and test coverage in the JDBC connector. Delivered a critical correction to the PostgreSQL Sink Connector: on conflict during upsert, unique key fields are no longer updated; only non-unique fields are updated. This prevents accidental modification of primary/unique keys and preserves data integrity in sink operations. Implemented a regression test to verify the corrected behavior. The change was recorded under commit d0c1de83576b7f79608c2d99a58ffb5657df3ac0 with message [Fix][Connector-jdbc] Fix postgresql sink trying to update unique key (#9293) (#9298). Impact: lowers production risk, improves correctness across upserts, and strengthens trust in Seatunnel's data pipelines for PostgreSQL sinks. Technologies demonstrated: Java, JDBC connector development, PostgreSQL, test-driven development, code review, and integration testing.

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