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-rw-r--r--synapse/storage/schema/delta/22/receipts_index.sql4
-rw-r--r--synapse/storage/schema/delta/28/events_room_stream.sql4
-rw-r--r--synapse/storage/schema/delta/28/public_roms_index.sql4
-rw-r--r--synapse/storage/schema/delta/28/receipts_user_id_index.sql4
-rw-r--r--synapse/storage/schema/delta/29/push_actions.sql4
-rw-r--r--synapse/storage/schema/delta/31/pushers_index.sql4
6 files changed, 24 insertions, 0 deletions
diff --git a/synapse/storage/schema/delta/22/receipts_index.sql b/synapse/storage/schema/delta/22/receipts_index.sql
index 7bc061dff6..bfc0b3bcaa 100644
--- a/synapse/storage/schema/delta/22/receipts_index.sql
+++ b/synapse/storage/schema/delta/22/receipts_index.sql
@@ -13,6 +13,10 @@
  * limitations under the License.
  */
 
+/** 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 receipts_linearized_room_stream ON receipts_linearized(
     room_id, stream_id
 );
diff --git a/synapse/storage/schema/delta/28/events_room_stream.sql b/synapse/storage/schema/delta/28/events_room_stream.sql
index 200c35e6e2..36609475f1 100644
--- a/synapse/storage/schema/delta/28/events_room_stream.sql
+++ b/synapse/storage/schema/delta/28/events_room_stream.sql
@@ -13,4 +13,8 @@
  * limitations under the License.
 */
 
+/** 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 events_room_stream on events(room_id, stream_ordering);
diff --git a/synapse/storage/schema/delta/28/public_roms_index.sql b/synapse/storage/schema/delta/28/public_roms_index.sql
index ba62a974a4..6c1fd68c5b 100644
--- a/synapse/storage/schema/delta/28/public_roms_index.sql
+++ b/synapse/storage/schema/delta/28/public_roms_index.sql
@@ -13,4 +13,8 @@
  * limitations under the License.
 */
 
+/** 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 public_room_index on rooms(is_public);
diff --git a/synapse/storage/schema/delta/28/receipts_user_id_index.sql b/synapse/storage/schema/delta/28/receipts_user_id_index.sql
index 452a1b3c6c..cb84c69baa 100644
--- a/synapse/storage/schema/delta/28/receipts_user_id_index.sql
+++ b/synapse/storage/schema/delta/28/receipts_user_id_index.sql
@@ -13,6 +13,10 @@
  * limitations under the License.
  */
 
+/** 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 receipts_linearized_user ON receipts_linearized(
     user_id
 );
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
 );
diff --git a/synapse/storage/schema/delta/31/pushers_index.sql b/synapse/storage/schema/delta/31/pushers_index.sql
index 9027bccc69..a82add88fd 100644
--- a/synapse/storage/schema/delta/31/pushers_index.sql
+++ b/synapse/storage/schema/delta/31/pushers_index.sql
@@ -13,6 +13,10 @@
  * limitations under the License.
  */
 
+/** 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_stream_ordering on event_push_actions(
      stream_ordering, user_id
  );