some changes on product stat model & signals

apps/product/migrations/0062_productstats_sale_unit_and_more.py

@@ -0,0 +1,28 @@
+# Generated by Django 5.0 on 2025-08-02 11:03
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('product', '0061_historicalquotadistribution_parent_distribution_and_more'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='productstats',
+            name='sale_unit',
+            field=models.CharField(max_length=25, null=True),
+        ),
+        migrations.AddField(
+            model_name='productstats',
+            name='total_distribution_weight',
+            field=models.PositiveBigIntegerField(default=0),
+        ),
+        migrations.AddField(
+            model_name='productstats',
+            name='total_remaining_distribution_weight',
+            field=models.PositiveBigIntegerField(default=0),
+        ),
+    ]