feat: Add stock management features including stock reservations and updates to cart and checkout processes

tienda/migrations/0004_product_stock_stockreservation_stockreservationitem.py

@@ -0,0 +1,45 @@
+# Generated by Django 6.0.1 on 2026-04-09 06:55
+
+import django.db.models.deletion
+from django.conf import settings
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('tienda', '0003_order_transaction_code'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='product',
+            name='stock',
+            field=models.PositiveIntegerField(default=0),
+        ),
+        migrations.CreateModel(
+            name='StockReservation',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('session_key', models.CharField(blank=True, max_length=40, null=True)),
+                ('status', models.CharField(choices=[('active', 'Activa'), ('completed', 'Completada'), ('cancelled', 'Cancelada'), ('expired', 'Expirada')], default='active', max_length=20)),
+                ('payment_method', models.CharField(choices=[('stripe', 'Stripe'), ('paypal', 'PayPal')], max_length=20)),
+                ('expires_at', models.DateTimeField(db_index=True)),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+                ('updated_at', models.DateTimeField(auto_now=True)),
+                ('user', models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='stock_reservations', to=settings.AUTH_USER_MODEL)),
+            ],
+        ),
+        migrations.CreateModel(
+            name='StockReservationItem',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('quantity', models.PositiveIntegerField(default=1)),
+                ('product', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='stock_reservation_items', to='tienda.product')),
+                ('reservation', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='items', to='tienda.stockreservation')),
+            ],
+            options={
+                'unique_together': {('reservation', 'product')},
+            },
+        ),
+    ]