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Interesting, this is very similar to some of the things we do to language runtimes at Temporal to ensure durability/resumability.

Is the persistence layer and the calls to persist/checkpoint pluggable/extensible?

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It's not currently pluggable but there are quite few interaction points between RTS & DB so I imagine it could be done relatively easily. Depending on what you want to do, this might work well or become ultra-slow ;) Acton persists the execution of individual continuations (like actor methods but chopped up at every I/O point), so if you write functions in certain ways, you end up with many commits and if the database is not super fast, this can become a real chokepoint.

There are design for how to improve this in Acton through batching and asynchronous commits.

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