QStringList CUser::getUserEmailsInRecentDays(const int days)
{
    ensureGlobalUsersTable();
    QList<QVariantList> values;
    QDateTime dateTimeToCompare = QDateTime::currentDateTime().addDays(- days);
    QMap<QDateTime, QStringList> mapOfEmails;

    d_databaseManager->get(kUsersGlobalTable, kUsersGlobalTableFields, values);

    for (auto variantList : values) {
        const auto email = variantList[0].toString();
        const auto dateTimeString = variantList[1].toString();
        const auto loggedDateTime = QDateTime::fromString(dateTimeString, Qt::ISODate);
        if (loggedDateTime.isValid() && (loggedDateTime > dateTimeToCompare))
            mapOfEmails[loggedDateTime] << email;
    }
    QStringList finalList;
    const auto listOfLists(mapOfEmails.values());
    for (const auto& list : listOfLists)
        finalList << list;
    return finalList;
}