Wow!, isn't it overkill just for a string with the name of the database?, a name that (yes or yes) must be used in each request?
Well, actually no, normally this name is used only once, when you're instantiating model the first time. It's a rather weird idea to use different databases for different users.
As for how to do this... Look documentation for Catalyst::Model::Adapter, you need to define prepare_arguments and mangle_arguments methods. If you want more control (and you probably do, you can cache models for different users), you can write your own ACCEPT_CONTEXT method (see docs for Catalyst::Component and sources of Catalyst::Model::Factory). All this may be a bit tricky, and documentation is not especially verbose, but I'm sure you will enjoy the process.
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