add index for cached_quiz_lti

Change-Id: I14d94148ce5a794a9c107d545c1db8af9ac2535e
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/291797
Reviewed-by: Weston Dransfield <wdransfield@instructure.com>
Migration-Review: Alex Slaughter <aslaughter@instructure.com>
QA-Review: Weston Dransfield <wdransfield@instructure.com>
Tested-by: Service Cloud Jenkins <svc.cloudjenkins@instructure.com>
Product-Review: Alex Slaughter <aslaughter@instructure.com>

db/migrate/20220512230624_add_cached_quiz_lti_index.rb

@@ -0,0 +1,28 @@
+# frozen_string_literal: true
+
+#
+# Copyright (C) 2022 - present Instructure, Inc.
+#
+# This file is part of Canvas.
+#
+# Canvas is free software: you can redistribute it and/or modify it under
+# the terms of the GNU Affero General Public License as published by the Free
+# Software Foundation, version 3 of the License.
+#
+# Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
+# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+# A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Affero General Public License along
+# with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+
+class AddCachedQuizLtiIndex < ActiveRecord::Migration[6.0]
+  tag :predeploy
+  disable_ddl_transaction!
+
+  def change
+    add_index :submissions, :cached_quiz_lti, algorithm: :concurrently, if_not_exists: true
+  end
+end