Alexandre focused on stabilizing migration tooling within the supabase/cli repository, addressing a bug that caused directories to be incorrectly detected as migration files during local database migrations. Using Go, Alexandre implemented a targeted fix that ensures only actual migration files are processed, reducing false positives and streamlining the developer workflow. This change improved the reliability of migration listings and decreased the need for manual debugging and review. By enhancing the local migration detection logic, Alexandre strengthened the quality of the CLI development process and supported safer migrations in both development and production environments, demonstrating depth in database migrations and tooling.