It is well hidden 

http://web2py.com/books/default/chapter/29/06/the-database-abstraction-layer?search=auth.signature#Table-inheritance

On Wednesday, 9 December 2015 00:17:17 UTC-6, at wrote:
>
> Hi,
>
> I am unable to find explanation of how does auth.signature works anywhere 
> including web2py documentation. I can see that after adding it to a 
> database table definition, it starts maintaining a revision history of the 
> records. I've also seen that deletion of a record does not actually delete 
> it from the database but it is marked as inactive; what is the recommended 
> way or configuration that allows me delete the *inactive* records from 
> the database?
>
> Thanks,
> AT
>

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