Version 0.4.1

Added

• Comprehensive test suite for overwrite behavior verification (test_overwrite_fix.py)
• Product Quantization (PQ) overwrite testing across all storage modes (test_pq_overwrite_comprehensive.py)
• Enhanced logging and storage analysis for overwrite operations
• Training state cleanup during document removal operations

Changed

• Overwrite operations now use two-phase process (remove then add) to prevent duplicates
• remove_point() method now delegates to internal remove_point_internal() for better code reuse
• Enhanced add() method with comprehensive PQ support and storage mode awareness
• Improved error handling and logging throughout overwrite operations

Fixed

• Critical: Fixed duplicate document bug where overwrite=True created multiple entries instead of replacing existing ones
• Memory leak from accumulated duplicate vectors in HNSW graph during overwrites
• Product Quantization codes and training state not properly cleaned up during document removal
• Vector count inconsistencies when removing documents during overwrite operations

Removed

• Legacy overwrite behavior that created duplicates instead of proper replacements