During November 2025, Yufan Wang enhanced the reliability of JDBC health checks for Oracle deployments in the databendlabs/databend repository. He developed a feature that introduced regex-based logic to accurately recognize the Oracle-specific 'SELECT 1 FROM DUAL' query, addressing a common source of false negatives in health monitoring. This solution was implemented in Rust and included comprehensive automated tests to ensure robust validation of the new behavior. By focusing on backend development and test-driven practices, Yufan’s work improved the accuracy of health checks for Oracle environments, supporting safer production rollouts and demonstrating depth in both Rust and backend engineering.