Over a three-month period, contributed to backend and database projects by enhancing SQL parsing and improving code maintainability. In the actiontech/sqle repository, developed logic to better extract and wrap subqueries from the FROM clause, refining SQL rule accuracy and strengthening unit test coverage for complex query scenarios using Go and SQL. For etcd-io/etcd, focused on code hygiene by removing unused logging components and updating release documentation to clarify dependency fixes and changelog entries, ensuring transparency and easier future maintenance. Work emphasized database internals, backend development, and documentation, with careful attention to version control and long-term code quality.