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Datomic Pro doesn't need AWS, I don't see what complications it can cause. It has some helpers for running it in AWS (like a bucket to export to CloudWatch), but none of them are mandatory. And if your use case is small you can run with dev storage (https://www.h2database.com/html/main.html); pretty much the same as you would SQLite.

It might be slightly harder to get started with, but then the simplicity comes in when it is time to solve common business problems. A trivial example would be - we have this nice db, now our clients want reports. You run your reporting as a separate clojure process, it doesn't impact production at all, without needing to setup reporting databases and log-shipping.