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My dad wrote a multi-thousand line turbo-prolog expert system to do airline gate assignment at JFK in the 80s https://scholar.google.com/scholar?cluster=74202497920445652...

TerminusDB is used commercially and most of it is written in prolog, although the underlying storage engine is written in Rust.

Datalog is still a good idea imho!

I did write a library management program for a large insurance company in Prolog, around 1988.

which is a chapter of the book