1 files changed, 12 insertions, 0 deletions
diff --git a/synapse/storage/engines/_base.py b/synapse/storage/engines/_base.py
index b1a2418cbd..830ae5fea3 100644
--- a/synapse/storage/engines/_base.py
+++ b/synapse/storage/engines/_base.py
@@ -58,6 +58,18 @@ class BaseDatabaseEngine(Generic[ConnectionType, CursorType], metaclass=abc.ABCM
         """Do we support the `RETURNING` clause in insert/update/delete?"""
         ...
 
+    @property
+    @abc.abstractmethod
+    def supports_select_distinct_on(self) -> bool:
+        """Do we support the `DISTINCT ON` clause in SELECT?"""
+        ...
+
+    @property
+    @abc.abstractmethod
+    def supports_sequences(self) -> bool:
+        """Do we support the `CREATE SEQUENCE` clause?"""
+        ...
+
     @abc.abstractmethod
     def check_database(
         self, db_conn: ConnectionType, allow_outdated_version: bool = False