User model override and authentication

Hello guys,
I'm not advanced in Django and would like to know how and if it's possible to do it.

I need to override Django's user model, and change the fields "username" to "sr_usuario" and "password" to "sr_password", but I would like to continue using all Django's default authentication scheme and permissions. I want not only to change the description in the database or a label, I want to change the name of the field in the model, for when for example I needed to make a query, I would use User.objects.filter(sr_usuario="user_name") and everything would work usually.

It's possible? I couldn't find anything in the documentation or on forums I've searched.

Thank you very much in advance!

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