new_contents: from django.core.management.base import BaseCommand
  from django.conf import settings
  from sorl.thumbnail import get_thumbnail
  from tqdm import tqdm
  
  from leaflets.models import LeafletImage
  
  class Command(BaseCommand):
  
      def handle(self, **options):
          for leaflet_image in tqdm(LeafletImage.objects.all().exclude(image="").order_by('?')):
              try:
                  get_thumbnail(leaflet_image.image, '350').url
                  get_thumbnail(leaflet_image.image, '100x100', crop='center').url
              except:
                  pass
  
subject: Add cache_images management command