GDBM-based storage abstraction with JSON document handling and extent attribute compatibility fixes.
• gdata_local_raw - Base GDBM wrapper with context manager support
• gdata_local_simple - JSON-aware document storage with automatic serialization
• Dictionary-like interface for document access
• Automatic JSON serialization/deserialization
• Context manager support for resource cleanup
• Extent attribute handling for filesystem compatibility
Handles extent filesystem attributes that can cause locking issues:
• Use chattr -e file.gdbm to remove extent attributes
• Lazy database initialization prevents import-time locks