code: public function addIcon($row, $label, Contao\DataContainer $dc, $args)
  	{
  		$image = 'member';
  		$time = Contao\Date::floorToMinute();
  
  		$disabled = ($row['start'] !== '' && $row['start'] > $time) || ($row['stop'] !== '' && $row['stop'] < $time);
  
  		if ($row['disable'] || $disabled)
  		{
  			$image .= '_';
  		}
  
  		$args[0] = sprintf('<div class="list_icon_new" style="background-image:url(\'%ssystem/themes/%s/icons/%s.svg\')" data-icon="%s.svg" data-icon-disabled="%s.svg">&nbsp;</div>', Contao\System::getContainer()->get('contao.assets.assets_context')->getStaticUrl(), Contao\Backend::getTheme(), $image, $disabled ? $image : rtrim($image, '_'), rtrim($image, '_') . '_');
  
  		return $args;
  	}
docs: Add an image to each record
  
  @param array                $row
  @param string               $label
  @param Contao\DataContainer $dc
  @param array                $args
  
  @return array