Add digest e-mails

app/workers/digest_mailer_worker.rb

@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+class DigestMailerWorker
+  include Sidekiq::Worker
+
+  sidekiq_options queue: 'mailers'
+
+  def perform(user_id)
+    user = User.find(user_id)
+    return unless user.settings.notification_emails['digest']
+    NotificationMailer.digest(user.account).deliver_now!
+    user.touch(:last_emailed_at)
+  end
+end