Andrey Smakotin 38ee2f5df7 Fix race condition and expired lock validation for showcase kit cart ...

- 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>

2025-11-22 19:00:48 +03:00

50 KiB

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