Don't idleswap expts with stale idle data.

db/idlemail.in

@@ -191,12 +191,14 @@ EOT
     # using two different queries.
     $sql  = <<EOT;
 select e.pid,e.eid, idleswap_timeout,
+(unix_timestamp(now()) - unix_timestamp(min(last_report))) as staleness,
 (unix_timestamp(now()) - unix_timestamp(max(greatest(
 last_tty_act,last_net_act,last_cpu_act,last_ext_act))))/60 as idlemin
 from reserved as r left join experiments as e on e.pid=r.pid and e.eid=r.eid
 left join node_activity as na on r.node_id=na.node_id
 where idleswap !=0 and swappable>0 and idle_ignore=0
-group by pid,eid having idlemin >= idleswap_timeout order by pid,eid
+group by pid,eid having idlemin >= idleswap_timeout and staleness < 600
+order by pid,eid
 EOT
     $q = DBQueryFatal($sql);
     if ($d) { print $q->as_string; $q->dataseek(0); }