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-rw-r--r--synapse/storage/database.py24
1 files changed, 24 insertions, 0 deletions
diff --git a/synapse/storage/database.py b/synapse/storage/database.py
index 8851710d47..78ca6d8346 100644
--- a/synapse/storage/database.py
+++ b/synapse/storage/database.py
@@ -1149,6 +1149,30 @@ class DatabasePool(object):
             allow_none=allow_none,
         )
 
+    @overload
+    @classmethod
+    def simple_select_one_onecol_txn(
+        cls,
+        txn: LoggingTransaction,
+        table: str,
+        keyvalues: Dict[str, Any],
+        retcol: Iterable[str],
+        allow_none: Literal[False] = False,
+    ) -> Any:
+        ...
+
+    @overload
+    @classmethod
+    def simple_select_one_onecol_txn(
+        cls,
+        txn: LoggingTransaction,
+        table: str,
+        keyvalues: Dict[str, Any],
+        retcol: Iterable[str],
+        allow_none: Literal[True] = True,
+    ) -> Optional[Any]:
+        ...
+
     @classmethod
     def simple_select_one_onecol_txn(
         cls,