1 files changed, 21 insertions, 0 deletions
diff --git a/db/post_migrate/20200311192351_add_index_on_noteable_type_and_noteable_id_to_sent_notifications.rb b/db/post_migrate/20200311192351_add_index_on_noteable_type_and_noteable_id_to_sent_notifications.rb
new file mode 100644
index 00000000000..fa0246218c3
--- /dev/null
+++ b/db/post_migrate/20200311192351_add_index_on_noteable_type_and_noteable_id_to_sent_notifications.rb
@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+class AddIndexOnNoteableTypeAndNoteableIdToSentNotifications < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+  INDEX_NAME = 'index_sent_notifications_on_noteable_type_noteable_id'
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index :sent_notifications,
+      [:noteable_id],
+      name: INDEX_NAME,
+      where: "noteable_type = 'Issue'"
+  end
+
+  def down
+    remove_concurrent_index_by_name :sent_notifications, INDEX_NAME
+  end
+end