old_contents: from django.db import models
  import base_models as base
  import sys
  
  with base.Dataset('tvnews'):
  
      class Video(base.Video):
          channel = base.CharField()
          show = base.CharField()
          time = models.DateTimeField()
  
      class Frame(base.Frame):
          talking_heads = models.BooleanField(default=False)
  
      class Labeler(base.Labeler):
          pass
  
      class Identity(base.Model):
          name = base.CharField()
  
      class Gender(base.Model):
          name = base.CharField()
  
      class Face(base.Concept):
          gender = models.ForeignKey(Gender, on_delete=models.CASCADE, null=True, blank=True)
          identity = models.ForeignKey(Identity, on_delete=models.CASCADE, null=True, blank=True)
  
  
  # with base.Dataset('krishna'):
  
  #     class Video(base.Video):
  #         pass
  
  #     class Frame(base.Frame):
  #         pass
  
  #     class Labeler(base.Labeler):
  #         pass
  
  #     class Face(base.Concept):
  #         pass
  
  #     class Person(base.Concept):
  #         pass
  
new_contents: from django.db import models
  import base_models as base
  import sys
  
  with base.Dataset('tvnews'):
  
      class Video(base.Video):
          channel = base.CharField()
          show = base.CharField()
          time = models.DateTimeField()
  
      class Frame(base.Frame):
          talking_heads = models.BooleanField(default=False)
  
      class Labeler(base.Labeler):
          pass
  
      class Identity(base.Model):
          name = base.CharField()
  
      class Gender(base.Model):
          name = base.CharField()
  
      class Face(base.Concept):
          gender = models.ForeignKey(Gender, on_delete=models.CASCADE, null=True, blank=True)
          identity = models.ForeignKey(Identity, on_delete=models.CASCADE, null=True, blank=True)
  
  
subject: Remove krishna