some first models of pos & add required to attributes

apps/warehouse/migrations/0012_inventoryentry_balance.py

@@ -0,0 +1,18 @@
+# Generated by Django 5.0 on 2025-07-20 08:59
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('warehouse', '0011_inventoryquotasaletransaction'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='inventoryentry',
+            name='balance',
+            field=models.PositiveBigIntegerField(default=0),
+        ),
+    ]

apps/warehouse/models.py

@@ -18,7 +18,7 @@ class InventoryEntry(BaseModel):
         null=True
     )
     weight = models.PositiveBigIntegerField(default=0)
-    balance = models
+    balance = models.PositiveBigIntegerField(default=0)
     lading_number = models.CharField(max_length=50, null=True)
     delivery_address = models.TextField(blank=True, null=True)
     document = models.CharField(max_length=250, null=True)