old_contents: from __future__ import absolute_import
  default_app_config = 'calaccess_processed.apps.CalAccessProcessedConfig'
  
new_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  import os
  default_app_config = 'calaccess_processed.apps.CalAccessProcessedConfig'
  
  
  def get_model_list():
      """
      Returns a model list of 
      """
      from django.apps import apps
      model_list = apps.get_app_config("calaccess_processed").models.values()
      return [
          m for m in model_list
          if m.__module__.split('.')[-1] != 'tracking'
      ]
  
  def archive_directory_path(instance, filename):
      """
      Returns a path to an archived processed data file or zip
      """
      from calaccess_processed.models.tracking import (
          ProcessedDataVersion,
          ProcessedDataFile,
      )
  
      if isinstance(instance, ProcessedDataVersion):
          release_datetime = instance.raw_version.release_datetime
          f_name, f_ext = filename.split('.')
          path = '{fn}_{dt:%Y-%m-%d_%H-%M-%S}.{fx}'.format(
              fn=f_name,
              dt=release_datetime,
              fx=f_ext,
          )
      elif isinstance(instance, ProcessedDataFile):
          release_datetime = instance.version.raw_version.release_datetime
          path = '{dt:%Y-%m-%d_%H-%M-%S}/{f}'.format(dt=release_datetime, f=filename)
      else:
          raise TypeError(
              "Must be ProcessedDataVersion or ProcessedDataFile instance."
          )
      return path
  
subject: Add get_model_list and archive_directory_path functions