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@futurebird @Jirikiha You might be able to build something with #Lucene (https://en.wikipedia.org/wiki/Apache_Lucene#Lucene-based_projects) or, for a much more lightweight option, with #Xapian (https://en.wikipedia.org/wiki/Xapian).

You'd still have to build something yourself from those though. For Xapian, looking at the source for #mu4e and #mu would probably be usable as a decent example (https://www.djcbsoftware.nl/code/mu/).

You'd also need to figure out some way to feed data exports from those into it.

All of my suggestions are #FreeSoftware & gratis.