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-rw-r--r--synapse/storage/background_updates.py16
1 files changed, 7 insertions, 9 deletions
diff --git a/synapse/storage/background_updates.py b/synapse/storage/background_updates.py
index 142787fdfd..82b31d24f1 100644
--- a/synapse/storage/background_updates.py
+++ b/synapse/storage/background_updates.py
@@ -92,14 +92,12 @@ class BackgroundUpdater:
         self.db_pool = database
 
         # if a background update is currently running, its name.
-        self._current_background_update = None  # type: Optional[str]
-
-        self._background_update_performance = (
-            {}
-        )  # type: Dict[str, BackgroundUpdatePerformance]
-        self._background_update_handlers = (
-            {}
-        )  # type: Dict[str, Callable[[JsonDict, int], Awaitable[int]]]
+        self._current_background_update: Optional[str] = None
+
+        self._background_update_performance: Dict[str, BackgroundUpdatePerformance] = {}
+        self._background_update_handlers: Dict[
+            str, Callable[[JsonDict, int], Awaitable[int]]
+        ] = {}
         self._all_done = False
 
     def start_doing_background_updates(self) -> None:
@@ -411,7 +409,7 @@ class BackgroundUpdater:
             c.execute(sql)
 
         if isinstance(self.db_pool.engine, engines.PostgresEngine):
-            runner = create_index_psql  # type: Optional[Callable[[Connection], None]]
+            runner: Optional[Callable[[Connection], None]] = create_index_psql
         elif psql_only:
             runner = None
         else: