old_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  """
  Custom administration panels for tracking models.
  """
  from __future__ import unicode_literals
  from django.contrib import admin
  from calaccess_raw import models
  from .base import BaseAdmin
  
  
  @admin.register(models.RawDataVersion)
  class RawDataVersionAdmin(BaseAdmin):
      """
      Custom admin for the RawDataVersion model.
      """
      list_display = (
          "id",
          "release_datetime",
          "pretty_download_size",
          "pretty_clean_size",
      )
      list_display_links = ('release_datetime',)
      list_filter = ("release_datetime",)
  
  
  @admin.register(models.RawDataFile)
  class RawDataFileAdmin(BaseAdmin):
      """
      Custom admin for the RawDataFile model.
      """
      list_display = (
          "id",
          "version",
          "file_name",
          "download_records_count",
          "clean_records_count",
          "load_records_count",
          "error_count",
          "download_columns_count",
          "clean_columns_count",
          "load_columns_count",
          "pretty_download_file_size",
          "pretty_clean_file_size"
      )
      list_display_links = ('id', 'file_name',)
      list_filter = ("version__release_datetime",)
  
new_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  """
  Custom administration panels for tracking models.
  """
  from __future__ import unicode_literals
  from django.contrib import admin
  from calaccess_raw import models
  from .base import BaseAdmin
  
  
  @admin.register(models.RawDataVersion)
  class RawDataVersionAdmin(BaseAdmin):
      """
      Custom admin for the RawDataVersion model.
      """
      list_display = (
          "id",
          "release_datetime",
          "pretty_download_size",
          "file_count",
          "record_count",
          "pretty_clean_size",
      )
      list_display_links = ('release_datetime',)
      list_filter = ("release_datetime",)
  
  
  @admin.register(models.RawDataFile)
  class RawDataFileAdmin(BaseAdmin):
      """
      Custom admin for the RawDataFile model.
      """
      list_display = (
          "id",
          "version",
          "file_name",
          "download_records_count",
          "clean_records_count",
          "load_records_count",
          "error_count"
      )
      list_display_links = ('id', 'file_name',)
      list_filter = ("version__release_datetime",)
  
subject: Update tracking.py