38ee2f5df70ba7507802ec25ac39ef43a104bf55
- Add select_for_update() with transaction.atomic() to prevent race condition when multiple users try to add the same showcase kit simultaneously - Validate cart lock expiration when loading cart from Redis - showcase kits with expired locks are now filtered out instead of being displayed 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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