For the record:

I just stumbled over the documentation for callbacks in DBI

https://metacpan.org/pod/DBI#Callbacks

It's a powerful way to inspect method calls on all handles.

It even provides a way to define callbacks an derived handles such that a database-handle $dbh defines callbacks for all children statement-handles $sth

DBI is impressively feature rich, no need to hack the modules (once you managed to read all the documentation ;-)