Single mod_perl Instance Serving Multiple Domains

I manage several low-traffic websites sites.  These sites use the classic 2-server Apache/mod_perl architecture.  The front-end server is a light Apache instance hosting a WordPress blog.  The heavy, back-end server is mod_perl-enabled Apache serving various web applications I’ve created. To the best of my understanding, mod_perl/Apache can only set-up and cache a single database connection.  …