script calm.sql:

select pg_cancel_backend(pid) from pg_stat_activity where state not like 'idle%' and now() - query_start > '20 seconds' and query ~ 'bib search' order by 1 desc;

cron entry (as postgres):

*/1 * * * *  psql -U evergreen < /var/lib/postgresql/scripts/calm.sql >> /var/lib/postgresql/scripts/calm.log