void WebWatcher::save(QIODevice* device)
{
    QXmlStreamWriter writer(device);
    writer.setAutoFormatting(true);
    writer.writeStartDocument();
    writer.writeStartElement(QLatin1String("WebWatcher"));

    writer.writeAttribute(QLatin1String("id_counter"), QString::number(id_count));
    writer.writeAttribute(QLatin1String("sites_count"), QString::number(sites.size()));

    for(const WatchedSite& site: sites)
    {
        writer.writeStartElement(QLatin1String("WatchedSite"));
        writer.writeAttribute(QLatin1String("id"), QString::number(site.id));

        writer.writeTextElement(QLatin1String("Url"), site.url.toString());
        writer.writeTextElement(QLatin1String("Title"), site.title);
        writer.writeTextElement(QLatin1String("Query"), site.jsQuery);
        writer.writeTextElement(QLatin1String("Interval"), QString::number(site.updateIntervalMs));
        for (size_t i = 0; i < site.probes.size(); i++)
        {
            writer.writeStartElement(QLatin1String("WatchedSiteProbe"));
            writer.writeAttribute(QLatin1String("id"), QString::number(site.id));
            writer.writeEndElement();
        }
        writer.writeTextElement(QLatin1String("LastUpdateTime"), QString::number(site.lastUpdateTimeMs));
        writer.writeTextElement(QLatin1String("LastHash"), QString::fromLatin1(site.lastHash.toBase64()));

        writer.writeEndElement();
    }

    writer.writeEndElement();
    writer.writeEndDocument();
}