1 files changed, 8 insertions, 0 deletions
diff --git a/synapse/storage/events.py b/synapse/storage/events.py
index ed182c8d11..6dc46fa50f 100644
--- a/synapse/storage/events.py
+++ b/synapse/storage/events.py
@@ -189,6 +189,14 @@ class EventsStore(SQLBaseStore):
             self._background_reindex_fields_sender,
         )
 
+        self.register_background_index_update(
+            "event_contains_url_index",
+            index_name="event_contains_url_index",
+            table="events",
+            columns=["room_id", "topological_ordering", "stream_ordering"],
+            where_clause="contains_url = true AND outlier = false",
+        )
+
         self._event_persist_queue = _EventPeristenceQueue()
 
     def persist_events(self, events_and_contexts, backfilled=False):