metaconfig=# select distinct on (exe_handler) exe_handler, id, run_schedule from configoperation order by exe_handler, run_schedule desc;
 exe_handler | id |    run_schedule     
-------------+----+---------------------
 aptget      |  5 | 2011-10-01 23:40:00
 config      |  1 | 2011-10-07 23:30:00
 management  |  3 | 2012-01-01 23:40:00
(3 rows)