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Good piece, tho not new ideas. Ton of references, two recent that immediately come to mind

But work here goes back at least to the 1970s.

The future's already here, just not evenly distributed :) I wrote this in part to surface these ideas to new people!

I'm pretty sure Eclipse or IntelliJ build a meaningful index of my code base... What about that ?

They do but those aren't made available to you like a database, just through their search tool and indirectly through their contextual lookups.

See also tools that build databases from code history, like