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-rw-r--r--synapse/storage/databases/main/directory.py7
1 files changed, 5 insertions, 2 deletions
diff --git a/synapse/storage/databases/main/directory.py b/synapse/storage/databases/main/directory.py
index 6daf8b8ffb..25131b1ea9 100644
--- a/synapse/storage/databases/main/directory.py
+++ b/synapse/storage/databases/main/directory.py
@@ -17,6 +17,7 @@ from typing import Iterable, List, Optional
 
 from synapse.api.errors import SynapseError
 from synapse.storage._base import SQLBaseStore
+from synapse.storage.database import LoggingTransaction
 from synapse.types import RoomAlias
 from synapse.util.caches.descriptors import cached
 
@@ -126,14 +127,16 @@ class DirectoryWorkerStore(SQLBaseStore):
 
 
 class DirectoryStore(DirectoryWorkerStore):
-    async def delete_room_alias(self, room_alias: RoomAlias) -> str:
+    async def delete_room_alias(self, room_alias: RoomAlias) -> Optional[str]:
         room_id = await self.db_pool.runInteraction(
             "delete_room_alias", self._delete_room_alias_txn, room_alias
         )
 
         return room_id
 
-    def _delete_room_alias_txn(self, txn, room_alias: RoomAlias) -> str:
+    def _delete_room_alias_txn(
+        self, txn: LoggingTransaction, room_alias: RoomAlias
+    ) -> Optional[str]:
         txn.execute(
             "SELECT room_id FROM room_aliases WHERE room_alias = ?",
             (room_alias.to_string(),),