[Python] When and where i use create_user from CreateUserManager()?

For several days now, I've been wondering why I should create my own user manager in Django, since in the end, when inheriting a built-in form, I don't refer to my created manager anyway.

class CustomUserManager(BaseUserManager):

def create_user(self, email, birth_date, password=None, **extra_fields):
if not email:
raise ValueError("You didn't entered a valid email address!")
email = self.normalize_email(email)
user = self.model(email=email, **extra_fields)
user.set_password(password)
user.save(using=self._db)
return user

def create_superuser(self, email, password, **extra_fields):
extra_fields.setdefault('is_stuff', True)
extra_fields.setdefault('is_superuser', True)

return self.create_user(email, password, **extra_fields)


I have something like this and in the end when it creates a user it doesn't go through that create_user anyway.

So my two questions:

1. 
   Why create something for a custom user if I don't end up using it anyway because the form inherits from UserCreationForm. So, for example, form.save() does not use my manager.
   
   
2. 
   At what point should this create_user be executed?
   

Continue reading...