old_contents: from django.db import models
  
  from adhocracy4.models import base
  from adhocracy4.modules import models as module_models
  
  
  class Category(base.UserGeneratedContentModel):
      name = models.CharField(max_length=120)
      module = models.ForeignKey(
          module_models.Module,
          on_delete=models.CASCADE,
      )
  
      class Meta:
          verbose_name_plural = 'categories'
  
      def __str__(self):
          return "{} - {}".format(self.module, self.name)
  
  
  class Categorizable(models.Model):
      category = models.ForeignKey(
          Category,
          on_delete=models.SET_NULL,
          null=True,
          blank=True,
      )
  
      class Meta:
          abstract = True
  
new_contents: from django.db import models
  
  from adhocracy4.modules import models as module_models
  
  
  class Category(models.Model):
      name = models.CharField(max_length=120)
      module = models.ForeignKey(
          module_models.Module,
          on_delete=models.CASCADE,
      )
  
      class Meta:
          verbose_name_plural = 'categories'
  
      def __str__(self):
          return "{} - {}".format(self.module, self.name)
  
  
  class Categorizable(models.Model):
      category = models.ForeignKey(
          Category,
          on_delete=models.SET_NULL,
          null=True,
          blank=True,
      )
  
      class Meta:
          abstract = True
  
subject: remove creator