Changes:
- Enhanced migration 002 with column existence checks to prevent duplicate column errors
- Added comprehensive migration 003 that syncs database with current model state
- Modified application startup to avoid conflicts between create_all() and Alembic
- Added proper table/column existence checking in migrations
- Improved migration safety for production environments
- Removed automatic table creation when database already exists (relies on migrations)
This resolves the 'duplicate column name' error by ensuring migrations
check for existing columns before attempting to add them.
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