I'm not sure what `request.peewee_dbs()[db].connect()` does, but I would 
probably recommend against this db setup pattern that you're using.  By 
doing this in a tween, every request that pyramid handles will do a 
connect/disconnect to all the databases you defined.

One of the more popular patterns to implement db connections is something 
like this:

- `add_request_method` provides an object that either returns an database 
connection, or creates a new one.
- if you create a new connection, it registers a 'db.close()' via 
`add_finished_callback`

this way you only connect as needed, and disconnect to actually connected 
databases.

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