diff --git a/synapse/storage/schema/delta/26/ts.py b/synapse/storage/schema/delta/26/ts.py
new file mode 100644
index 0000000000..8d4a981975
--- /dev/null
+++ b/synapse/storage/schema/delta/26/ts.py
@@ -0,0 +1,57 @@
+# Copyright 2015 OpenMarket 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.
+
+import logging
+
+from synapse.storage.prepare_database import get_statements
+
+import ujson
+
+logger = logging.getLogger(__name__)
+
+
+ALTER_TABLE = (
+ "ALTER TABLE events ADD COLUMN origin_server_ts BIGINT;"
+ "CREATE INDEX events_ts ON events(origin_server_ts, stream_ordering);"
+)
+
+
+def run_upgrade(cur, database_engine, *args, **kwargs):
+ for statement in get_statements(ALTER_TABLE.splitlines()):
+ cur.execute(statement)
+
+ cur.execute("SELECT MIN(stream_ordering) FROM events")
+ rows = cur.fetchall()
+ min_stream_id = rows[0][0]
+
+ cur.execute("SELECT MAX(stream_ordering) FROM events")
+ rows = cur.fetchall()
+ max_stream_id = rows[0][0]
+
+ if min_stream_id is not None and max_stream_id is not None:
+ progress = {
+ "target_min_stream_id_inclusive": min_stream_id,
+ "max_stream_id_exclusive": max_stream_id + 1,
+ "rows_inserted": 0,
+ }
+ progress_json = ujson.dumps(progress)
+
+ sql = (
+ "INSERT into background_updates (update_name, progress_json)"
+ " VALUES (?, ?)"
+ )
+
+ sql = database_engine.convert_param_style(sql)
+
+ cur.execute(sql, ("event_origin_server_ts", progress_json))
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