-my $q = $dbh->prepare('select port,coalesce(description, \'Port \' || port) as description,extract(epoch from time) as time,bytes_in,bytes_out from polls natural join switches natural left join portnames where time between \'2005-03-23 05:17:36+01\' and \'2005-03-24 05:17:36+01\' and switch=? order by switch,port,time;');
+my $q = $dbh->prepare('select port,coalesce(description, \'Port \' || port) as description,extract(epoch from time) as time,bytes_in,bytes_out from polls natural join switches natural left join portnames where time between now() - \'1 day\'::interval and now() and switch=? order by switch,port,time;');