newsletter-bundle/src/Resources/contao/dca/tl_newsletter_recipients.php
public function clearOptInData(Contao\DataContainer $dc)
	{
		$this->Database->prepare("UPDATE tl_newsletter_recipients SET addedOn='' WHERE id=?")
					   ->execute($dc->id);
	}
public function clearOptInData(Contao\DataContainer $dc)
	{
		$this->Database->prepare("UPDATE tl_newsletter_recipients SET addedOn='' WHERE id=?")
					   ->execute($dc->id);
	}
Set the recipient status to "added manually" if they are moved to another channel

@param Contao\DataContainer $dc