old_contents: from django.apps import AppConfig
  from django.conf import settings
  from common.helpers.db import db_is_initialized
  
  
  class CommonConfig(AppConfig):
      name = 'common'
  
      def ready(self):
          self.display_missing_environment_variables()
          from common.helpers.tags import import_tags_from_csv
          if db_is_initialized():
              import_tags_from_csv()
  
      def display_missing_environment_variables(self):
          missing_required_variables = []
          for key, value in settings.ENVIRONMENT_VARIABLE_WARNINGS.items():
              if not (hasattr(settings, key)):
                  if value['error']:
                      missing_required_variables.append(key)
                  print(key + ' not set: ' + value['message'])
          if len(missing_required_variables) > 0:
              raise EnvironmentError('Required environment variables missing: ' + ','.join(missing_required_variables))
  
new_contents: import sys
  from django.apps import AppConfig
  from django.conf import settings
  from common.helpers.db import db_is_initialized
  
  
  class CommonConfig(AppConfig):
      name = 'common'
  
      def ready(self):
          self.display_missing_environment_variables()
          from common.helpers.tags import import_tags_from_csv
          if 'loaddata' in sys.argv:
              self.loaddata_clean()
          elif db_is_initialized():
              import_tags_from_csv()
  
      def display_missing_environment_variables(self):
          missing_required_variables = []
          for key, value in settings.ENVIRONMENT_VARIABLE_WARNINGS.items():
              if not (hasattr(settings, key)):
                  if value['error']:
                      missing_required_variables.append(key)
                  print(key + ' not set: ' + value['message'])
          if len(missing_required_variables) > 0:
              raise EnvironmentError('Required environment variables missing: ' + ','.join(missing_required_variables))
  
      def loaddata_clean(self):
          from django.contrib.contenttypes.models import ContentType
          ContentType.objects.all().delete()
  
subject: Clean content types table and don't load tags when running loaddata