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-rw-r--r--synapse/storage/schema/delta/29/push_actions.sql4
1 files changed, 4 insertions, 0 deletions
diff --git a/synapse/storage/schema/delta/29/push_actions.sql b/synapse/storage/schema/delta/29/push_actions.sql
index 7e7b09820a..84b21cf813 100644
--- a/synapse/storage/schema/delta/29/push_actions.sql
+++ b/synapse/storage/schema/delta/29/push_actions.sql
@@ -26,6 +26,10 @@ UPDATE event_push_actions SET stream_ordering = (
 
 UPDATE event_push_actions SET notif = 1, highlight = 0;
 
+/** Using CREATE INDEX directly is deprecated in favour of using background
+ * update see synapse/storage/schema/delta/33/access_tokens_device_index.sql
+ * and synapse/storage/registration.py for an example using
+ * "access_tokens_device_index" **/
 CREATE INDEX event_push_actions_rm_tokens on event_push_actions(
     user_id, room_id, topological_ordering, stream_ordering
 );