old_contents: from django.contrib import admin
  from feedhoos.worker.models.entry import EntryModel
  from feedhoos.finder.models.feed import FeedModel
  from feedhoos.reader.models.bookmark import BookmarkModel
  
  
  admin.site.register(EntryModel)
  admin.site.register(FeedModel)
  admin.site.register(BookmarkModel)
  
new_contents: from django.contrib import admin
  from feedhoos.worker.models.entry import EntryModel
  from feedhoos.finder.models.feed import FeedModel
  from feedhoos.reader.models.bookmark import BookmarkModel
  
  
  class EntryModelAdmin(admin.ModelAdmin):
      list_display = ('id', "feed_id", "updated", 'url', 'title')
  admin.site.register(EntryModel, EntryModelAdmin)
  
  
  class FeedModelAdmin(admin.ModelAdmin):
      list_display = ('id', "title", "etag", "modified", "url", "last_access")
  admin.site.register(FeedModel, FeedModelAdmin)
  
  
  class BookmarkModelAdmin(admin.ModelAdmin):
      list_display = ('id', "last_updated")
  admin.site.register(BookmarkModel, BookmarkModelAdmin)
  
subject: add col