QList<SchedulesTableModel::Row> m_rows;
    ...
    for (int i = 0; i < m_rows.size(); ++i) {
        if (!activeSchedules.contains(m_rows[i].schedule.get_id())) {
            m_model->beginRemoveRows(QModelIndex(), i, i);
            m_rows.removeAt(i);
            --i;
            m_model->endRemoveRows();
        }
    }