'Set ``session_token`` and ``session_expires``.
:database: One UPDATE, one row'

def update_session(self, new_token, expires):

    self.db.run(u'\n                                                UPDATE    participants\n                                                            SET    session_token=%s\n                                                                    ,    session_expires=%s\n                                                    WHERE    id=%s\n                                                            AND    is_suspicious    IS    NOT    true\n                                ', (new_token, expires, self.id))
    self.set_attributes(session_token=new_token, session_expires=expires)
