add index

db/migrate/20261102120000_add_submission_events_account_event_type_created_at_index.rb

@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+class AddSubmissionEventsAccountEventTypeCreatedAtIndex < ActiveRecord::Migration[8.1]
+  def change
+    return unless ENV['MULTITENANT'] == 'true'
+
+    add_index :submission_events, %i[account_id created_at],
+              where: "event_type = 'start_kba'",
+              if_not_exists: true,
+              name: 'index_submission_events_on_account_created_at_start_kba'
+  end
+end