old_contents: from django.core.management.base import BaseCommand
  from reads.bookmarks.models import Bookmark
  import json
  
  
  class Command(BaseCommand):
      help = 'Import pinboard json export into database'
  
      def add_arguments(self, parser):
          parser.add_argument('file')
  
      def handle(self, *args, **options):
          with open(options['file']) as fobj:
              data = json.load(fobj)
              Bookmark.objects.bulk_create([Bookmark(**x) for x in data])
  
          print("done.")
  
new_contents: from django.core.management.base import BaseCommand
  from reads.bookmarks.models import Bookmark
  import json
  
  
  class Command(BaseCommand):
      help = 'Import pinboard json backup into database'
  
      def add_arguments(self, parser):
          parser.add_argument('file')
  
      def handle(self, *args, **options):
          with open(options['file']) as fobj:
              data = json.load(fobj)
              Bookmark.objects.bulk_create([Bookmark(**x) for x in data])
  
          print("done.")
  
subject: Adjust docstring.