populate completed_at

db/migrate/20260701165617_add_index_on_submissions_completed_at.rb

@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+class AddIndexOnSubmissionsCompletedAt < ActiveRecord::Migration[8.1]
+  def change
+    add_index :submissions, %i[account_id completed_at],
+              where: 'completed_at IS NOT NULL AND archived_at IS NULL',
+              name: 'index_submissions_on_account_id_and_completed_at',
+              if_not_exists: true
+
+    return unless connection.supports_partial_index?
+
+    add_index :submissions, %i[account_id id],
+              where: 'completed_at IS NULL AND archived_at IS NULL',
+              name: 'index_submissions_on_account_id_and_id_pending',
+              if_not_exists: true
+  end
+end