Ha! I was going to reply to this comment - "If you're interested in data-all-the-things, then you should take a look at Hyperfiddle" - until I recognized the user handle and realized that you already knew about Hyperfiddle. (for those reading along, dustingetz built Hyperfiddle)

still building! we killed the saas thing for now and are releasing a web framework soon - declarative crud apps from nothing but function defs, specs, and datomic! All IO is managed and composes like Datomic Peer fns compose. Userland has no async, error handling etc. Complex pickers with typeahead search, query params etc are declared in one LOC

And we'll have to go back using sqlite again

there is also an on Prem solution, and I believe that's what such customer wants.

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Is a "transaction log" not exactly the technical shape of a bank?

It's definitely the shape of accounting