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-rw-r--r--synapse/storage/schema/delta/30/deleted_pushers.sql1
1 files changed, 1 insertions, 0 deletions
diff --git a/synapse/storage/schema/delta/30/deleted_pushers.sql b/synapse/storage/schema/delta/30/deleted_pushers.sql
index cdcf79ac81..712c454aa1 100644
--- a/synapse/storage/schema/delta/30/deleted_pushers.sql
+++ b/synapse/storage/schema/delta/30/deleted_pushers.sql
@@ -18,6 +18,7 @@ CREATE TABLE IF NOT EXISTS deleted_pushers(
     app_id TEXT NOT NULL,
     pushkey TEXT NOT NULL,
     user_id TEXT NOT NULL,
+    /* We only track the most recent delete for each app_id, pushkey and user_id. */
     UNIQUE (app_id, pushkey, user_id)
 );