Trying to find something in multiple databases... Confused...

Ok, I'm a total django noob here, so I am probably doing this wrong...  But here goes...

When someone comes to my django app's root (index), I need to verify their user-name (which is stored in a Linux environment variable).  Based on where (or if) I find their user-name, I want to send them to one of three different pages -- if I don't find them in any database, I want to add them to a given database, then send them to a page.

So here's what I have in my views.py file:
def index(request)
     current_username = os.environ['REMOTE_USER']

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