🐛 Database Fixes:
- Added unique constraint on user_cards (user_id, card_id)
- Added unique constraint on collection_cards (collection_id, card_id)
- Fixed ON CONFLICT clauses in card ownership API
✨ Auto-Sync Feature:
- Card ownership now automatically syncs with 'All My Cards' collection
- When user marks card as owned → added to system collection
- When user removes ownership → removed from system collection
- Real-time bidirectional sync between user_cards and collection_cards
🔄 Migration Script:
- Cleaned up any duplicate entries
- Added necessary database constraints
- Synced existing owned cards (0 users had existing data)
🎯 API Improvements:
- Simplified card ownership API (removed GET method)
- Better error handling and validation
- Clear success messages for user feedback
- Automatic collection management
Card ownership should now work perfectly! 🚀
