batch processor for migrating FA user favs

rake/fa.rake

@@ -230,4 +230,12 @@ namespace :fa do
       Domain::User.find_by_param("fa@#{url_name}") || raise("user not found")
     Domain::Fa::BackfillTrackedObjectUserFavs.new(user:).run
   end
+
+  desc "Migrate Domain::UserPostFav::FaUserPostFav"
+  task migrate_fa_user_post_favs: :set_logger_stdout do
+    Tasks::Fa::MigrateFaUserPostFavs.new.run(
+      start_at: ENV["start_at"],
+      batch_size: ENV["batch_size"]&.to_i,
+    )
+  end
 end