old_contents: from django.db import models
  
  class ExperimentGroup(models.Model):
      experiment = models.CharField(max_length=48)
  
      user = models.ForeignKey('auth.User', related_name=None)
  
      group = models.IntegerField()
  
      class Meta:
          unique_together = (
              ('experiment', 'user'),
          )
  
  class ExperimentState(models.Model):
      experiment = models.CharField(max_length=48, primary_key=True)
  
      started = models.DateTimeField(null=True)
      completed = models.DateTimeField(null=True)
  
  class ExperimentResult(models.Model):
      experiment = models.CharField(max_length=48)
      group = models.IntegerField()
      metric = models.IntegerField()
  
      percentile = models.IntegerField()
      value = models.FloatField()
  
      class Meta:
          unique_together = (
              ('experiment', 'group', 'metric', 'percentile'),
          )
  
new_contents: from django.db import models
  
  class ExperimentGroup(models.Model):
      experiment = models.CharField(max_length=48)
  
      user = models.ForeignKey(
          'auth.User',
          related_name='django_split_experiment_groups',
      )
  
      group = models.IntegerField()
  
      class Meta:
          unique_together = (
              ('experiment', 'user'),
          )
  
  class ExperimentState(models.Model):
      experiment = models.CharField(max_length=48, primary_key=True)
  
      started = models.DateTimeField(null=True)
      completed = models.DateTimeField(null=True)
  
  class ExperimentResult(models.Model):
      experiment = models.CharField(max_length=48)
      group = models.IntegerField()
      metric = models.IntegerField()
  
      percentile = models.IntegerField()
      value = models.FloatField()
  
      class Meta:
          unique_together = (
              ('experiment', 'group', 'metric', 'percentile'),
          )
  
subject: Add an explicit related name