How to use the Database Router?

I'm trying to shard my database horizontally.

In another thread (http://groups.google.com/group/django-users/
browse_thread/thread/2748cdf205b5cf3e/
e8fe5087748d3c43#e8fe5087748d3c43) I was told it's best to use the
Database Router to implement horizontal sharding.

But I can't figure out how to use the Database Router to do what i
want. The documentation doesn't contain a lot of info either.

I have a model "Tweet".

What I'd like to do is to shard Tweet into N different databases/
tables.

When I need to read/write a Tweet object, I want to look at the Tweet
author's userid, take modulo N of the id, and then depending on the
result, route the operation to one of the N databases/tables.

Is it possible to do that using the Database Router?

Thanks.

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