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May I suggest CRIU (https://criu.org/) as a possible solution to problem of long-running processes?

Yes, it's not exactly production ready, but theoretically it could solve all problems related to 'long running' tasks, by allowing PA to move processes to other machines before a restart, and by suspending idle processes until they are accessed again.

The later would be helpful when giving people a way to run their own services (db, task queues, etc.)

Thanks for the suggestion! I remember we had a look at that a long time ago, but IIRC at the time it required kernel patches that wouldn't work on our system. That may have changed...

But that said, we're actually getting quite close to a long-running process implementation that we can release -- most of our development work over the last few months has been on it :-)