Features: 1) Add system_attributes JSONField to Stock model; 2) Introduce StockForm with system_attributes widget; 3) Integrate StockForm into StockAdmin in Django admin panel.

Fixes: None;

Extra: 1) Update migrations to include addition of `system_attributes`; 2) Modify admin interface to display `system_attributes` in additional_fields.

core/admin.py

@@ -16,7 +16,7 @@ from modeltranslation.translator import NotRegistered, translator
 from modeltranslation.utils import get_translation_fields
 from mptt.admin import DraggableMPTTAdmin
 
-from core.forms import CRMForm, OrderForm, OrderProductForm, VendorForm
+from core.forms import CRMForm, OrderForm, OrderProductForm, StockForm, VendorForm
 from core.models import (
     Address,
     Attribute,
@@ -743,6 +743,7 @@ class PromotionAdmin(FieldsetsMixin, ActivationActionsMixin, ModelAdmin):  # typ
 class StockAdmin(FieldsetsMixin, ActivationActionsMixin, ModelAdmin):  # type: ignore [misc, type-arg]
     # noinspection PyClassVar
     model = Stock  # type: ignore [misc]
+    form = StockForm
     list_display = (
         "product",
         "vendor",
@@ -777,6 +778,9 @@ class StockAdmin(FieldsetsMixin, ActivationActionsMixin, ModelAdmin):  # type: i
         "purchase_price",
         "digital_asset",
     ]
+    additional_fields = [
+        "system_attributes",
+    ]
     relation_fields = [
         "product",
         "vendor",

core/forms.py

@@ -42,6 +42,15 @@ class OrderProductForm(forms.ModelForm):
         }
 
 
+class StockForm(forms.ModelForm):
+    class Meta:
+        model = Product
+        fields = "__all__"
+        widgets = {
+            "system_attributes": JSONTableWidget(),
+        }
+
+
 class OrderForm(forms.ModelForm):
     class Meta:
         model = Order

core/migrations/0051_stock_system_attributes.py

@@ -0,0 +1,18 @@
+# Generated by Django 5.2.7 on 2025-10-26 16:59
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('core', '0050_remove_attribute_categories'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='stock',
+            name='system_attributes',
+            field=models.JSONField(default=dict, verbose_name='system attributes'),
+        ),
+    ]

core/models.py

@@ -551,6 +551,7 @@ class Stock(ExportModelOperationsMixin("stock"), NiceModel):  # type: ignore [mi
         verbose_name=_("digital file"),
         upload_to="downloadables/",
     )
+    system_attributes = JSONField(default=dict, verbose_name=_("system attributes"))
 
     def __str__(self) -> str:
         return f"{self.vendor.name} - {self.product!s}"