public ChannelExt update(ChannelExt ext) {
Updater<ChannelExt> updater = new Updater<ChannelExt>(ext);
updater.include(ChannelExt.PROP_FINAL_STEP);
updater.include(ChannelExt.PROP_AFTER_CHECK);
ChannelExt entity = dao.updateByUpdater(updater);
entity.blankToNull();
return entity;
}