Grinn,
All of Trooper execution stats are available in JSON format as well. For e.g.
http://<host name>:8182/jobs.json will provide Job details in JSON and supports REST style navigation.
You can also look at http://<host name>:8182/jobs/executions.json for execution details of all jobs and navigate to specific instances as needed.
One way to achieve what you are looking for would be to write a cron job that pulls these stats off Trooper batch and stores them someplace for analysis.
A slightly more involved method is to replace all of Trooper Batch DAOs (which currently store data in memory) with the DB based ones (Look at Spring batch for guidance). In this case, all execution details are logged to a database.
Hope this helps.
Regu