diff --git a/synapse/storage/schema/main/delta/56/unique_user_filter_index.py b/synapse/storage/schema/main/delta/56/unique_user_filter_index.py
index 2461f87d77..b7535dae14 100644
--- a/synapse/storage/schema/main/delta/56/unique_user_filter_index.py
+++ b/synapse/storage/schema/main/delta/56/unique_user_filter_index.py
@@ -41,8 +41,6 @@ def run_create(cur: LoggingTransaction, database_engine: BaseDatabaseEngine) ->
(user_id, filter_id);
DROP TABLE user_filters;
ALTER TABLE user_filters_migration RENAME TO user_filters;
- """ % (
- select_clause,
- )
+ """ % (select_clause,)
execute_statements_from_stream(cur, StringIO(sql))
diff --git a/synapse/storage/schema/main/delta/61/03recreate_min_depth.py b/synapse/storage/schema/main/delta/61/03recreate_min_depth.py
index 5d3578eaf4..a847ef4147 100644
--- a/synapse/storage/schema/main/delta/61/03recreate_min_depth.py
+++ b/synapse/storage/schema/main/delta/61/03recreate_min_depth.py
@@ -23,6 +23,7 @@
This migration handles the process of changing the type of `room_depth.min_depth` to
a BIGINT.
"""
+
from synapse.storage.database import LoggingTransaction
from synapse.storage.engines import BaseDatabaseEngine, PostgresEngine
diff --git a/synapse/storage/schema/main/delta/68/05partial_state_rooms_triggers.py b/synapse/storage/schema/main/delta/68/05partial_state_rooms_triggers.py
index b4d4b6536b..9ac3d1d31f 100644
--- a/synapse/storage/schema/main/delta/68/05partial_state_rooms_triggers.py
+++ b/synapse/storage/schema/main/delta/68/05partial_state_rooms_triggers.py
@@ -25,6 +25,7 @@ This migration adds triggers to the partial_state_events tables to enforce uniqu
Triggers cannot be expressed in .sql files, so we have to use a separate file.
"""
+
from synapse.storage.database import LoggingTransaction
from synapse.storage.engines import BaseDatabaseEngine, PostgresEngine, Sqlite3Engine
diff --git a/synapse/storage/schema/main/delta/72/07force_update_current_state_events_membership.py b/synapse/storage/schema/main/delta/72/07force_update_current_state_events_membership.py
index 93543fca7c..be80a6747d 100644
--- a/synapse/storage/schema/main/delta/72/07force_update_current_state_events_membership.py
+++ b/synapse/storage/schema/main/delta/72/07force_update_current_state_events_membership.py
@@ -26,6 +26,7 @@ for its completion can be removed.
Note the background job must still remain defined in the database class.
"""
+
from synapse.config.homeserver import HomeServerConfig
from synapse.storage.database import LoggingTransaction
from synapse.storage.engines import BaseDatabaseEngine
diff --git a/synapse/storage/schema/main/delta/74/04_membership_tables_event_stream_ordering_triggers.py b/synapse/storage/schema/main/delta/74/04_membership_tables_event_stream_ordering_triggers.py
index 6609ef0dac..a847a93494 100644
--- a/synapse/storage/schema/main/delta/74/04_membership_tables_event_stream_ordering_triggers.py
+++ b/synapse/storage/schema/main/delta/74/04_membership_tables_event_stream_ordering_triggers.py
@@ -24,6 +24,7 @@
This migration adds triggers to the room membership tables to enforce consistency.
Triggers cannot be expressed in .sql files, so we have to use a separate file.
"""
+
from synapse.storage.database import LoggingTransaction
from synapse.storage.engines import BaseDatabaseEngine, PostgresEngine, Sqlite3Engine
diff --git a/synapse/storage/schema/main/delta/78/03event_extremities_constraints.py b/synapse/storage/schema/main/delta/78/03event_extremities_constraints.py
index ad9c394162..1c823a3aa1 100644
--- a/synapse/storage/schema/main/delta/78/03event_extremities_constraints.py
+++ b/synapse/storage/schema/main/delta/78/03event_extremities_constraints.py
@@ -23,6 +23,7 @@
"""
This migration adds foreign key constraint to `event_forward_extremities` table.
"""
+
from synapse.storage.background_updates import (
ForeignKeyConstraint,
run_validate_constraint_and_delete_rows_schema_delta,
|