fix: refactor index_together to indexes for Django 5.2 support (#36708)

lms/djangoapps/experiments/migrations/0006_rename_experimentdata_user_experiment_id_user_experiment_id_idx.py

@@ -0,0 +1,18 @@
+# Generated by Django 4.2.20 on 2025-05-13 10:12
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('experiments', '0005_alter_historicalexperimentkeyvalue_options'),
+    ]
+
+    operations = [
+        migrations.RenameIndex(
+            model_name='experimentdata',
+            new_name='user_experiment_id_idx',
+            old_fields=('user', 'experiment_id'),
+        ),
+    ]

lms/djangoapps/experiments/models.py

@@ -23,9 +23,12 @@ class ExperimentData(TimeStampedModel):
     value = models.TextField()
 
     class Meta:
-        index_together = (
-            ('user', 'experiment_id'),
-        )
+        indexes = [
+            models.Index(
+                fields=['user', 'experiment_id'],
+                name="user_experiment_id_idx",
+            ),
+        ]
         verbose_name = 'Experiment Data'
         verbose_name_plural = 'Experiment Data'
         unique_together = (