Fix product reservation system for demo orders

PROBLEM ANALYSIS:
- SQL script created orders bypassing Django ORM
- Django signals (post_save) didn't trigger
- No reservations were created automatically
- Found 51 orders with 102 items and 0 reservations

SOLUTION IMPLEMENTED:

1. Updated create_demo_orders command:
   - Added clear documentation about ORM usage
   - Already uses ORM (.save()) which triggers signals
   - Added informative messages about automatic reservations

2. Created fix_missing_reservations command:
   - Finds OrderItems without reservations
   - Creates missing Reservation records
   - Supports --dry-run mode for safety
   - Handles missing warehouses gracefully

3. Created SQL fix script:
   - Direct SQL approach for existing data
   - Creates reservations for all 102 items
   - Status: 'reserved'
   - Verified: All items now have reservations

4. Added verification scripts:
   - check_orders.py: Shows orders/items/reservations count
   - run_fix_reservations.py: Executes SQL fix

RESULTS:
- ✓ 102 reservations created for existing orders
- ✓ Future orders will use ORM and create reservations automatically
- ✓ System now works correctly

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

myproject/orders/management/commands/create_demo_orders.py

@@ -1,5 +1,7 @@
 """
 Management команда для создания демо-заказов на разные даты
+ВАЖНО: Создает заказы через Django ORM, что автоматически активирует
+сигналы резервирования товаров!
 """
 from django.core.management.base import BaseCommand
 from django.utils import timezone
@@ -15,7 +17,7 @@ from products.models import Product
 
 
 class Command(BaseCommand):
-    help = 'Создает 20-30 демо-заказов на разные даты'
+    help = 'Создает демо-заказы через ORM (с автоматическим резервированием товаров)'
 
     def add_arguments(self, parser):
         parser.add_argument(
@@ -39,7 +41,8 @@ class Command(BaseCommand):
         with connection.cursor() as cursor:
             cursor.execute(f'SET search_path TO {schema_name}')
 
-        self.stdout.write(f'Начинаем создание демо-заказов в схеме {schema_name}...')
+        self.stdout.write(f'[НАЧАЛО] Создание {count} демо-заказов в схеме {schema_name}...')
+        self.stdout.write('[INFO] Заказы создаются через ORM - резервы товаров будут созданы автоматически!')
 
         # Проверяем наличие необходимых данных
         customers = list(Customer.objects.all())
@@ -193,10 +196,11 @@ class Command(BaseCommand):
                 order.save()
 
                 created_count += 1
-                self.stdout.write(f'  Создан заказ #{order.order_number} на {delivery_date}')
+                self.stdout.write(f'  [OK] Заказ #{order.order_number} на {delivery_date} (товаров: {len(order_products)})')
 
             except Exception as e:
-                self.stdout.write(self.style.ERROR(f'Ошибка при создании заказа {i+1}: {str(e)}'))
+                self.stdout.write(self.style.ERROR(f'[ОШИБКА] Заказ {i+1}: {str(e)}'))
 
-        self.stdout.write(self.style.SUCCESS(f'\nУспешно создано {created_count} заказов!'))
+        self.stdout.write(self.style.SUCCESS(f'\n[ЗАВЕРШЕНО] Успешно создано {created_count} заказов!'))
         self.stdout.write(f'Даты доставки: от {today - timedelta(days=15)} до {today + timedelta(days=15)}')
+        self.stdout.write(self.style.SUCCESS('\n[ВАЖНО] Резервы товаров созданы автоматически через Django сигналы!'))