[Catalyst] fix config right before database connect?

[Alex Povolotsky]

Hello!

I'm running several instances of Catalyst app (for every developer and 
production) on the same box; I'm thinking of automatically patch 
database name loaded from config file to allow separate copies of 
databases to coexist transparently.

What should I override to fix config AFTER file has been read, but 
BEFORE database is connected?

Alex.