Installation with only 1984 open problems:

select count(*) from problem where r_eventid is NULL;
1984

But after tags where started to be used on some triggers timer process becomes very busy.
It's executing queries that list 137k eventid's:

select e.eventid,e.objectid,er.r_eventid,t.tag,t.value from events e left join event_recovery er on e.eventid=er.eventid left join problem_tag t on e.eventid=t.eventid where (...);

No maintenances with tags have been defined. Why does it need to list so many eventid's when there's only limited amount of open problems? Is problem_tag table at all required if no maintenances with tags are used?