Minor perf fixes to `get_auth_chain_ids`.

1 files changed, 1 insertions, 1 deletions

diff --git a/synapse/storage/database.py b/synapse/storage/database.py

index 3eeb2f7c04..6dcb5c04da 100644
--- a/synapse/storage/database.py
+++ b/synapse/storage/database.py
@@ -1504,7 +1504,7 @@ class Database(object):
 
 def make_in_list_sql_clause(
     database_engine, column: str, iterable: Iterable
-) -> Tuple[str, Iterable]:
+) -> Tuple[str, list]:
     """Returns an SQL clause that checks the given column is in the iterable.
 
     On SQLite this expands to `column IN (?, ?, ...)`, whereas on Postgres