$tags->selectAdd('max(notice_id) as last_notice_id');
$calc = common_sql_weight('created', common_config('tag', 'dropoff'));
$cutoff = sprintf("notice_tag.created > '%s'",
common_sql_date(time() - common_config('tag', 'cutoff')));
$tags->selectAdd($calc . ' as weight');
$tags->selectAdd('max(notice_id) as last_notice_id');
$calc = common_sql_weight('created', common_config('tag', 'dropoff'));
$cutoff = sprintf("notice_tag.created > '%s'",
common_sql_date(time() - common_config('tag', 'cutoff')));
$tags->selectAdd($calc . ' as weight');