I probably simply do not know the correct search terms for that issue.
At the moment, on my on-premise installation, I can see completed processes for around 48h, but we would love to move that up to 168h. Can I do that via the Admin Console? Or do I have to adjust some config file? In any case: Where do I do that?
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The "system default" value is set in some system config file which I would've thought would be one of the standard ones (like custom.properties) though I haven't touched these in forever. Any chance your question is answered here? https://docs.appian.com/suite/help/21.4/Managing_Process_Archives.html
Edit to add: this link appears to contain the exact answer: https://docs.appian.com/suite/help/21.4/Data_Maintenance.html
Also just to note, each process model can be set independently, though sadly each process model's value must be hardcoded for some reason.
To summarize, I have to proceed as follows, right?
I'm out of date on how to stop / restart the engines for a local install, but assuming your steps 1-4 and 6-9 are the correct steps and ordering, then this sounds good to go ;-)