Harden auth, AI tutor, payments, and subscriptions

subscription/migrations/0003_subscription_version.py

@@ -0,0 +1,18 @@
+# Generated by Django 5.2.17 on 2026-08-21 22:34
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('subscription', '0002_plan_duration_days'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='subscription',
+            name='version',
+            field=models.PositiveIntegerField(default=0),
+        ),
+    ]