- Updated application version to 0.8.15 in both backend and frontend files.
- Enhanced database migration logic for co-trainer backfill using a subquery and CASE statement, improving robustness.
- Updated changelog to reflect the new version and changes made.
- Changed logging output for PostgreSQL readiness, schema loading, and migration status to a consistent format using [OK], [FAIL], and [WARN].
- Updated application version to 0.8.14 and modified changelog to reflect recent changes, including a fix for co-trainer backfill logic in the database migration.
- Enhanced error handling messages for better clarity during migration processes.
