I'm considering building my next web app in either Django or Rails
because I'm sick of php.  Before I jump in though, I was wondering how
django handles multicolumn keys.  It seems like django is geared more
toward keeping separate tables for different types of things and using
single column joins between these types, rather than having a highly
noramalized database schema.  If anyone could respond with problems
they've had trying to implement complex schema or (hopefully) tips on
how django makes this easy, I'd be interested to hear them.

A quick example:  how would I go about implementing something like this
in django?
Suppose I have users with lists of their favorite websites.  I want to
allow each user to tag each website, but the tag should only apply for
that user.  So i need a multicolumn key in my relation.

websites:
id
url

users:
id
name

tags:
id
tag

users-tags-websites-relation:
user_id
tag_id
website_id
The key for this last table is (user_id,tag_id).

I could also foresee situations where I would use a key on 3-tuples,
etc.  How well is django equipped to handle relationships like this?

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