Task 9: Clean up legacy code
- Added deprecation warnings to Serie.save_to_file() and load_from_file()
- Updated infrastructure.md with Data Storage section documenting:
- SQLite database as primary storage
- Legacy file storage as deprecated
- Data migration process
- Added deprecation warning tests for Serie class
- Updated existing tests to handle new warnings
- All 1012 tests pass (872 unit + 55 API + 85 integration)
Lukas
396b243d59