old_contents: from django.db import models
  from django.conf import settings
  from django import get_version
  
  from django_hstore_mixin.models import HstoreMixin
  
  # determine if geodjango is in use
  # GEODJANGO = settings.DATABASES['default']['ENGINE'] == 'django.contrib.gis.db.backends.postgis'
  
  
  __all__ = [
      'TestModel',
  ]
  
  
  class TestModel(HstoreMixin):
      pass
  
new_contents: from django_hstore_mixin.models import HstoreMixin
  
  # determine if geodjango is in use
  # GEODJANGO = settings.DATABASES['default']['ENGINE'] == 'django.contrib.gis.db.backends.postgis'
  
  
  __all__ = [
      'TestModel',
  ]
  
  
  class TestModel(HstoreMixin):
      pass
  
subject: Remove unused imports