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I am regularly alarmed by the fact that nobody has tried to make an open source clone yet..

Well, why would they? Clones would be using relatively old technology. The current bleeding-edge research here is on more-structured, more-formal knowledge representation, stuff like FQL/AQL [0] which is open-source from the first day. Maybe Datomic's not sufficiently better than Pg or SQLite to motivate anybody.

[0] http://categoricaldata.net/fql.html

That looks very interesting! Do you have a recommended point of entry for a non-academic practitioner like myself? :)

What about:

https://github.com/mozilla/mentat https://github.com/tonsky/datascript

Mentat is built for embedding, not for large applications. Datascript is in-memory for browsers.

But you're right, it's not fair to say that there's not been any effort! :)

Work is beeing done to transition datascript into a a much more database like thing:

"datahike is a durable database with an efficient datalog query engine. This project is a port of datascript to the hitchhiker-tree."

https://github.com/replikativ/datahike

Interesting, keep 'em coming!

Historical information is not part of datahike, now and it's not on the roadmap as far as I can tell. But perhaps one day :)

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