old_contents: from django.db import models
  from django.contrib.auth.models import AbstractBaseUser
  
  class User(AbstractBaseUser):
      full_name = models.CharField(max_length=250, blank=False)
      email = models.EmailField(unique=True)
      is_admin = models.BooleanField(default=False, blank=False)
  
      USERNAME_FIELD = "email"
  
  class Employee(User):
      pass
  
new_contents: from django.db import models
  from django.contrib.auth.models import AbstractBaseUser
  from ..companies.models import Company, Team
  
  class User(AbstractBaseUser):
      full_name = models.CharField(max_length=250, blank=False)
      email = models.EmailField(unique=True)
      is_admin = models.BooleanField(default=False, blank=False)
  
      USERNAME_FIELD = "email"
  
  class Employee(User):
      company = models.ForeignKey(Company)
      team = models.ForeignKey(Team, null=True)
  
subject: add fields to employee model