Db::undelete() 

\nn\t3::Db()->undelete($table = '', $constraint = []); 

Restore deleted database entry. To do this, the flag for "deleted" is set to 0 again.

\nn\t3::Db()->undelete('table', $uid);
\nn\t3::Db()->undelete('table', ['uid_local'=>$uid]);
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@param string $table
@param array $constraint
@return boolean

Source Code 

public function undelete ( $table = '', $constraint = [] )
{
	if (!$constraint) return false;
	if (is_numeric($constraint)) {
		$constraint = ['uid' => $constraint];
	}
	if ($deleteColumn = $this->getDeleteColumn( $table )) {
		return $this->update( $table, [$deleteColumn => 0], $constraint );
	}
	return false;
}
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