Configuration improvements:
- Set read_timeout=300 (5 minutes) to handle long queries
- Set write_timeout=300 (5 minutes) for writes
- Set max_allowed_packet=64MB to handle larger data transfers
Retry logic:
- Added retry mechanism with max 3 retries on fetch failure
- Auto-reconnect on connection loss before retry
- Better error messages showing retry attempts
This fixes the 'connection is lost' error that occurs during
long-running migrations by:
1. Giving MySQL queries more time to complete
2. Allowing larger packet sizes for bulk data
3. Automatically recovering from connection drops
Fixes: 'Connection is lost' error during full migration
- TABLE_CONFIGS now accepts both 'RAWDATACOR' and 'rawdatacor' as keys
- TABLE_CONFIGS now accepts both 'ELABDATADISP' and 'elabdatadisp' as keys
- Reuse same config dict for both cases to avoid duplication
This allows FullMigrator to work correctly when initialized with
uppercase table names from the CLI while DataTransformer works
with lowercase names.
Fixes: 'Unknown table: RAWDATACOR' error during migration
- Fix ConfigDict model_config for Pydantic v2.12+ compatibility
- Add env_file and env_file_encoding to all config classes
- Each config class now properly loads from .env with correct prefix
Fixes: ValidationError when loading settings from .env file
CLI now works correctly with 'uv run python main.py'
