The code is here: 
http://code.google.com/p/web2py/source/browse/gluon/tools.py#1452

Uniqueness is checked via the form validators rather than unique=True 
(which is enforced at the database level). The validators are more useful 
because they display a user friendly error message on the form rather than 
causing a database operational error and a 500 response.

Anthony

On Sunday, February 10, 2013 11:11:39 AM UTC-5, Yarin wrote:
>
> Why are email/username fields not created with (unique=True) by default? 
> Since these fields are use to identify users, non-unique values would 
> clearly break auth.
>
> (Side note: where is the code for defining the default auth table fields 
> located?- can't find it anywhere)
>

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