can't attach more info to User

Hi,
When i used to add more info to User using the method described in the standard specification and the inheritance method i couldnot do it. Here is what it says:
My addon model UserProfile is composed of char, integer, date fields. And when i create a user it says sth like 'column username not unique' and in other trials 'app_modelname.field cannot be NULL'. It also creates a file dbname-journal. What's happening; i've setup settings.py well but couldnot get to work for me. THANK YOU!!!

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