text: from django.db import models
  from django.contrib.auth.models import User
  
  
  class Mail(models.Model):
      user = models.ForeignKey(User)
      mail_address = models.CharField(max_length=200)
  
  
  class MailAuth(models.Model):
      mail = models.ForeignKey(Mail)
      authorization_code = models.CharField(max_length=200)
      refresh_token = models.CharField(max_length=200)
  
  
  class Credential(models.Model):
      user = models.ForeignKey(User)
      twilio_account_sid = models.CharField(max_length=100)
      twilio_auth_token = models.CharField(max_length=100)
      twilio_phone_from = models.CharField(max_length=50)
      twilio_phone_to = models.CharField(max_length=50)
  
  
  class Gmail(models.Model):
      client_id = models.CharField(max_length=100)
      client_secret = models.CharField(max_length=100)