- Implement `check_released_reservations_available` function to verify if items from released reservations are still available for re-sale when attempting to change a returned order's status
- Update `create_sale_on_order_completion` signal to use this check, allowing transitions to positive statuses only if items are available, otherwise blocking with ValidationError
- Wrap Order.save() in transaction.atomic() to ensure ValidationError in signals rolls back the save operation
- Add comprehensive tests for scenarios where items are available or used in other orders
- Update date carousel in order to always center on today's date and remove unnecessary saving logic
- Add test flag to Django Debug Toolbar settings
Closes#123 (assuming related issue)
Andrey Smakotin
1654962ba2