Worked on the supabase/cli repository to enhance the stability and reliability of declarative schema synchronization in local development environments. Addressed an issue where local Postgres container images could drift from the expected version after CLI upgrades, potentially causing incorrect migrations. Developed the Postgres Schema Synchronization Guard, which inspects the running container’s image tag, compares it to the required version, and provides actionable remediation steps when mismatches are detected. Implemented comprehensive unit and integration tests in Go and TypeScript to validate detection across various scenarios, improving developer experience by reducing debugging time and ensuring more reliable migrations using Docker and PostgreSQL.