Back in April 2009 there has been some drh notes on fossil mailing list about searching/using FTS
on repositories, for details see e.g.
where:

<pre>
It has been "considered".  But little action has been taken yet....

I did modify the makefile so that the Full Text Search engine of
SQLite is complied in.  I was thinking that might be useful for
implementing search.  But so far it is unused.

An interesting research project would be to try to figure out how to
do search across all historical versions of a project.
</pre>


In march 2009 there was an offer to help with "free advice on how to proceed" with integrating SQLite CLI to fossil by drh.

Would it be possible to provide some hints, e.g. for searching content of artifact in compressed/deltified blobs?

Hopefully this would allow more interested peole to focus on implementation of this needed functionality.

Many thanks.