drop unique condition first

treeherder/perf/migrations/0055_remove_performancealerttesting_related_summary_and_more.py

@@ -10,6 +10,10 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        migrations.AlterUniqueTogether(
+            name="performancealerttesting",
+            unique_together=None,
+        ),
         migrations.RemoveField(
             model_name="performancealerttesting",
             name="related_summary",
@@ -18,10 +22,6 @@ class Migration(migrations.Migration):
             model_name="performancealerttesting",
             name="summary",
         ),
-        migrations.AlterUniqueTogether(
-            name="performancealerttesting",
-            unique_together=None,
-        ),
         migrations.RemoveField(
             model_name="performancealerttesting",
             name="classifier",