text: from api.models import CustomUser
  from django.db import models
  
  
  class Pet(models.Model):
      name = models.CharField(max_length=100)
      pet_sitter = models.ForeignKey(CustomUser, on_delete=models.CASCADE)
      owner = models.ForeignKey(
          CustomUser, on_delete=models.CASCADE, related_name="pets", blank=True, null=True
      )
  
  
  class Booking(models.Model):
      pet = models.ForeignKey(Pet, on_delete=models.CASCADE)
      start_date = models.DateTimeField()
      end_date = models.DateTimeField()
  