As far as I know, if it is a question of running Tk in a server, C::A should do.

If that is not the case, you should manage well with O.O.Perl (the new magick). There is no need of fearing of loosing connection.

But if that is the case, just save your data in a file with YAML .pm or any XML.pm and then read it again.

Busines logic should be done by an analisis, I guess. It is better done before starting the code. It should be done in order to structure you future data. With a well structured data, you'll have 50% of the plumbing done.