code: public function setPrivateChatUpdateRead (Neuron_GameServer_Player $from, Neuron_GameServer_Player $target)
  	{
  		$db = Neuron_DB_Database::getInstance ();
  		
  		$db->query
  		("
  			UPDATE
  				n_privatechat_updates
  			SET
  				pu_read = '1'
  			WHERE
  				pu_to = {$target->getId ()} AND
  				pu_from = {$from->getId ()}
  		");
  	}
docs: Set all messages to a certain player to "read"