Within JDE there is not a defined list. There are a number of programs that can be ran, scheduler purge, submitted jobs purge, work center purge, package build history, OMW log history etc. However you have to come up with a schedule based on what works for your organization. For us SOX wants us to retain 1 year technical history for things like OMW logging History and scheduler, if this is not a requirement for you, you can purge monthly.