1 files changed, 6 insertions, 0 deletions
diff --git a/synapse/storage/engines/_base.py b/synapse/storage/engines/_base.py
index 1882bfd9cf..20cd63c330 100644
--- a/synapse/storage/engines/_base.py
+++ b/synapse/storage/engines/_base.py
@@ -49,6 +49,12 @@ class BaseDatabaseEngine(Generic[ConnectionType], metaclass=abc.ABCMeta):
         """
         ...
 
+    @property
+    @abc.abstractmethod
+    def supports_returning(self) -> bool:
+        """Do we support the `RETURNING` clause in insert/update/delete?"""
+        ...
+
     @abc.abstractmethod
     def check_database(
         self, db_conn: ConnectionType, allow_outdated_version: bool = False