Firewall on Demand

from django.contrib.auth.models import User

from django.core.validators import MaxLengthValidator

NEW_USERNAME_LENGTH = 255

def monkey_patch_username():

    username = User._meta.get_field("username")

    username.max_length = NEW_USERNAME_LENGTH

    for v in username.validators:

        if isinstance(v, MaxLengthValidator):

            v.limit_value = NEW_USERNAME_LENGTH

monkey_patch_username()