diff --git a/synapse/storage/schema/delta/37/remove_auth_idx.py b/synapse/storage/schema/delta/37/remove_auth_idx.py
index 784f3b348f..20ad8bd5a6 100644
--- a/synapse/storage/schema/delta/37/remove_auth_idx.py
+++ b/synapse/storage/schema/delta/37/remove_auth_idx.py
@@ -36,6 +36,10 @@ DROP INDEX IF EXISTS transactions_have_ref;
-- and is used incredibly rarely.
DROP INDEX IF EXISTS events_order_topo_stream_room;
+-- an equivalent index to this actually gets re-created in delta 41, because it
+-- turned out that deleting it wasn't a great plan :/. In any case, let's
+-- delete it here, and delta 41 will create a new one with an added UNIQUE
+-- constraint
DROP INDEX IF EXISTS event_search_ev_idx;
"""
diff --git a/synapse/storage/schema/delta/41/event_search_event_id_idx.sql b/synapse/storage/schema/delta/41/event_search_event_id_idx.sql
new file mode 100644
index 0000000000..5d9cfecf36
--- /dev/null
+++ b/synapse/storage/schema/delta/41/event_search_event_id_idx.sql
@@ -0,0 +1,17 @@
+/* Copyright 2017 Vector Creations Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+INSERT into background_updates (update_name, progress_json)
+ VALUES ('event_search_event_id_idx', '{}');
diff --git a/synapse/storage/schema/delta/41/ratelimit.sql b/synapse/storage/schema/delta/41/ratelimit.sql
new file mode 100644
index 0000000000..a194bf0238
--- /dev/null
+++ b/synapse/storage/schema/delta/41/ratelimit.sql
@@ -0,0 +1,22 @@
+/* Copyright 2017 Vector Creations Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+CREATE TABLE ratelimit_override (
+ user_id TEXT NOT NULL,
+ messages_per_second BIGINT,
+ burst_count BIGINT
+);
+
+CREATE UNIQUE INDEX ratelimit_override_idx ON ratelimit_override(user_id);
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