auth.signature on delete restrict

[cdbaron]

Hi,

I'm trying to use auth.signature with on delete restrict in the foreign keys `created_by` and` modified_by` but it doesn't seem to work.

I tried with auth.settings.ondelete = 'RESTRICT' but it doesn't work. auth.signature is defined when instantiating the Auth class.

How can I change the auth.settings?

Thank you.