Thie previous DELETE statement lead to strange
behaviours. It was pure luck this did not blow up
before all these years. It appears it may leave the index
in an undefined state, and the database recently started
to display strange behaviour in connection with newer sqlite
version.
Now, just remove the previous revision from the FTS index,
as for now, search only cares about the most recent revisions.
Also, remove redundant UPDATE trigger on revision table
We never update revisions, thus such trigger is simply
redundant.
Relevant: https://gitlab.gnome.org/GNOME/tracker/-/merge_requests/353
