Worked on the usememos/memos repository to enhance cross-database migration reliability by addressing a compatibility issue between PostgreSQL and SQLite. Focused on database migration and SQL, the developer refactored migration scripts to replace PostgreSQL-specific syntax with a universally supported EXISTS clause. This adjustment resolved a migration error that previously prevented SQLite from processing certain queries, ensuring that migrations now function consistently across both database systems. By improving the migration logic, the work reduced deployment risks and streamlined the process for environments using different databases. The contribution centered on SQL and database migration, emphasizing robust, environment-agnostic data handling within the project.