Worked on backend stability and migration tooling across OCA/server-tools and odoo/upgrade-util repositories, focusing on Python and database management. Addressed deprecation warnings in OCA/server-tools by updating imports to use collections.abc, aligning the codebase with modern Python standards and improving runtime stability. In odoo/upgrade-util, enhanced the reliability of batch model removal by ensuring unique record identification, which reduced migration risk and downtime during upgrades. The technical approach emphasized clear commit documentation and maintainable code, supporting future audits and migrations. Throughout, applied backend development expertise to resolve bugs and improve data integrity without introducing new features during the review period.