Forward-ported test and release note from f46a16614

Refs #24015.

docs/releases/1.7.2.txt

@@ -155,3 +155,6 @@ Bugfixes
 * Ensured the app registry is fully populated when unpickling models. When an
   external script (like a queueing infrastructure) reloads pickled models, it
   could crash with an ``AppRegistryNotReady`` exception (:ticket:`24007`).
+
+* Added quoting to field indexes in the SQL generated by migrations to prevent
+  a crash when the index name requires it (:ticket:`#24015`).

tests/indexes/tests.py

@@ -12,8 +12,16 @@ class CreationIndexesTests(TestCase):
     Test index handling by the to-be-deprecated connection.creation interface.
     """
     def test_index_together(self):
-        index_sql = connection.creation.sql_indexes_for_model(Article, no_style())
+        editor = connection.schema_editor()
+        index_sql = editor._model_indexes_sql(Article)
         self.assertEqual(len(index_sql), 1)
+        # Ensure the index name is properly quoted
+        self.assertIn(
+            connection.ops.quote_name(
+                editor._create_index_name(Article, ['headline', 'pub_date'], suffix='_idx')
+            ),
+            index_sql[0]
+        )
 
     def test_index_together_single_list(self):
         # Test for using index_together with a single list (#22172)