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-rw-r--r--synapse/storage/schema/delta/54/delete_forward_extremities.sql3
1 files changed, 3 insertions, 0 deletions
diff --git a/synapse/storage/schema/delta/54/delete_forward_extremities.sql b/synapse/storage/schema/delta/54/delete_forward_extremities.sql
index 7056bd1d00..aa40f13da7 100644
--- a/synapse/storage/schema/delta/54/delete_forward_extremities.sql
+++ b/synapse/storage/schema/delta/54/delete_forward_extremities.sql
@@ -13,7 +13,10 @@
  * limitations under the License.
  */
 
+-- Start a background job to cleanup extremities that were incorrectly added
+-- by bug #5269.
 INSERT INTO background_updates (update_name, progress_json) VALUES
   ('delete_soft_failed_extremities', '{}');
 
+DROP TABLE IF EXISTS _extremities_to_check;  -- To make this delta schema file idempotent.
 CREATE TABLE _extremities_to_check AS SELECT event_id FROM event_forward_extremities;