NodeProgress receivers skip raw saves (loaddata duplicated rows on the Postgres move)

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

content/tests_loaddata_raw.py

@@ -0,0 +1,18 @@
+"""loaddata (انتقال به Postgres) نباید از روی سیگنال NodeProgress بسازد: خودِ ردیف در فایل است."""
+from django.db.models.signals import post_save
+from django.test import TestCase
+
+from content.models import Choice, Grade, Lesson, Node, NodeProgress, Question, Unit, UserAnswer
+
+
+class RawSaveTests(TestCase):
+    def test_raw_user_answer_save_creates_no_node_progress(self):
+        grade = Grade.objects.create(title='g', number=99)
+        unit = Unit.objects.create(grade=grade, title='u', order=1)
+        node = Node.objects.create(unit=unit, title='n', order=1)
+        lesson = Lesson.objects.create(node=node, title='l')
+        q = Question.objects.create(lesson=lesson, type='multiple_choice', prompt='p')
+        c = Choice.objects.create(question=q, value='a', is_correct=True)
+        answer = UserAnswer(user_id=1, question=q, choice=c, correct=True)
+        post_save.send(UserAnswer, instance=answer, created=True, raw=True)
+        self.assertEqual(NodeProgress.objects.count(), 0)