Worked on the strapi/strapi repository to enhance migration stability during the v4 to v5 upgrade process. Addressed a critical issue in the discard-drafts migration by implementing robust null checks for inverseJoinColumn within morphToMany (polymorphic) relations, using TypeScript and database management skills. This technical approach prevented TypeErrors that previously caused crashes when joinTable.inverseJoinColumn was undefined, ensuring migrations could complete safely. The solution was applied across seven code paths, reducing the risk of upgrade-related downtime for projects utilizing polymorphic content types and dynamic zones. Focused on migration management, the work improved deployment reliability and overall codebase resilience.