system/Session/Handlers/DatabaseHandler.php
public function gc($maxlifetime): bool
	{
		return ($this->db->table($this->table)->delete('timestamp < ' . (time() - $maxlifetime))) ? true : $this->fail();
	}
public function gc($maxlifetime): bool
	{
		return ($this->db->table($this->table)->delete('timestamp < ' . (time() - $maxlifetime))) ? true : $this->fail();
	}
Garbage Collector

Deletes expired sessions

@param integer $maxlifetime Maximum lifetime of sessions

@return boolean