new_contents: from django.core.management.base import BaseCommand
  from corehq.apps.locations.models import Location
  
  
  class Command(BaseCommand):
      help = 'Generate missing site codes for locations'
  
      def handle(self, *args, **options):
          self.stdout.write("Populating site codes...\n")
  
          relevant_ids = set([r['id'] for r in Location.get_db().view(
              'locations/by_type',
              reduce=False,
          ).all()])
  
          for loc_id in relevant_ids:
              loc = Location.get(loc_id)
              if not loc.site_code:
                  # triggering the safe will cause this to get populated
                  self.stdout.write("Updating location %s\n" % loc.name)
                  loc.save()
  
subject: Add management command to populate site codes