old_contents: from django.db import models
  from audit_log.models import AuthStampedModel
  from django_extensions.db.models import TimeStampedModel
  
  # Create your models here.
  
  
  class MaintenanceJob(AuthStampedModel, TimeStampedModel):
      name = models.CharField(max_length=100)
      description = models.CharField(max_length=400)
      def __str__(self):
          return self.name
  
  class MaintenanceTaskDetailItems(AuthStampedModel,TimeStampedModel):
      orderfield = models.IntegerField()
      task = models.CharField(max_length=250)
      maintjob = models.ForeignKey(MaintenanceJob, null=True, blank=True)
      def __str__(self):
          return self.task
  
new_contents: from django.db import models
  from audit_log.models import AuthStampedModel
  from django_extensions.db.models import TimeStampedModel
  
  # Create your models here.
  
  
  class MaintenanceJob(AuthStampedModel, TimeStampedModel):
      name = models.CharField(max_length=100)
      description = models.CharField(max_length=400)
      def __str__(self):
          return self.name
  
  class MaintenanceTaskDetailItems(AuthStampedModel,TimeStampedModel):
      orderfield = models.IntegerField()
      task = models.CharField(max_length=250)
      maintjob_id = models.ForeignKey(MaintenanceJob, null=True, blank=True)
      def __str__(self):
          return self.task
  
subject: Update models.py