$res = XDB::query("SELECT count(r.stamp), UNIX_TIMESTAMP(MIN(r.stamp)),
sum(r.stamp < NOW() - $M_PERIOD), sum(r.stamp < NOW() - $R_PERIOD)
$res = XDB::query("SELECT count(r.stamp), UNIX_TIMESTAMP(MIN(r.stamp)),
sum(r.stamp < NOW() - $M_PERIOD), sum(r.stamp < NOW() - $R_PERIOD)