Made DatabaseFeatures.uses_savepoints default to True.

django/db/backends/base/features.py

@@ -26,7 +26,7 @@ class BaseDatabaseFeatures:
     can_return_id_from_insert = False
     can_return_ids_from_bulk_insert = False
     has_bulk_insert = True
-    uses_savepoints = False
+    uses_savepoints = True
     can_release_savepoints = False
 
     # If True, don't use integer foreign keys referring to, e.g., positive

django/db/backends/dummy/features.py

@@ -3,3 +3,4 @@ from django.db.backends.base.features import BaseDatabaseFeatures
 
 class DummyDatabaseFeatures(BaseDatabaseFeatures):
     supports_transactions = False
+    uses_savepoints = False

django/db/backends/mysql/features.py

@@ -23,7 +23,6 @@ class DatabaseFeatures(BaseDatabaseFeatures):
     supports_timezones = False
     requires_explicit_null_ordering_when_grouping = True
     allows_auto_pk_0 = False
-    uses_savepoints = True
     can_release_savepoints = True
     atomic_transactions = False
     supports_column_check_constraints = False

django/db/backends/oracle/features.py

@@ -5,7 +5,6 @@ from django.utils.functional import cached_property
 
 class DatabaseFeatures(BaseDatabaseFeatures):
     interprets_empty_strings_as_nulls = True
-    uses_savepoints = True
     has_select_for_update = True
     has_select_for_update_nowait = True
     has_select_for_update_skip_locked = True

django/db/backends/postgresql/features.py

@@ -14,7 +14,6 @@ class DatabaseFeatures(BaseDatabaseFeatures):
     has_select_for_update = True
     has_select_for_update_nowait = True
     has_select_for_update_of = True
-    uses_savepoints = True
     can_release_savepoints = True
     supports_tablespaces = True
     supports_transactions = True

django/db/backends/sqlite3/features.py

@@ -29,7 +29,6 @@ class DatabaseFeatures(BaseDatabaseFeatures):
     ignores_table_name_case = True
     supports_cast_with_precision = False
     time_cast_precision = 3
-    uses_savepoints = True
     can_release_savepoints = True
 
     @cached_property

docs/releases/2.2.txt

@@ -283,6 +283,8 @@ Database backend API
   ``DurationField`` or set ``DatabaseFeatures.can_introspect_duration_field``
   to ``False``.
 
+* ``DatabaseFeatures.uses_savepoints`` now defaults to ``True``.
+
 :mod:`django.contrib.gis`
 -------------------------