Worked on the Qbox-project/qbx_core repository to address a schema migration issue affecting the players table in a MySQL database. Focused on database management and SQL, the developer delivered a targeted bug fix by updating the schema definition to use ADD COLUMN IF NOT EXISTS instead of ADD IF NOT EXISTS for specific columns. This change stabilized schema migrations, prevented runtime errors, and ensured backward compatibility during deployments. The approach emphasized reliability and maintainability, with careful validation of the migration path and clear commit documentation. No new features were released, but the work contributed to improved data integrity and deployment safety.