old_contents: from django.core.management.base import BaseCommand
  from django.conf import settings
  from ...models import OverallDriverPrediction, OverallConstructorPrediction
  
  
  class Command(BaseCommand):
      can_import_settings = True
  
      def handle(self, *args, **kwargs):
          conn = settings.REDIS_CONN
          num_ranks = conn.zcard("ranks")
          conn.zremrangebyscore("ranks", 0, num_ranks)
          for driver_prediction in OverallDriverPrediction.objects.all():
              conn.zadd("ranks",
                        driver_prediction.user.username,
                        driver_prediction.score)
          for constructor_prediction in OverallConstructorPrediction.objects.all():
              score = conn.zscore("ranks", constructor_prediction.user.username)
              if not score:
                  score = 0
              conn.zadd("ranks",
                        constructor_prediction.user.username,
                        constructor_prediction.score + score)
  
new_contents: from django.core.management.base import BaseCommand
  from django.conf import settings
  from ...models import OverallDriverPrediction, OverallConstructorPrediction
  
  
  class Command(BaseCommand):
      can_import_settings = True
  
      def handle(self, *args, **kwargs):
          conn = settings.REDIS_CONN
          num_ranks = conn.zcard("ranks")
          conn.zremrangebyscore("ranks", 0, num_ranks + 1)
          for driver_prediction in OverallDriverPrediction.objects.all():
              conn.zadd("ranks",
                        driver_prediction.user.username,
                        driver_prediction.score)
          for constructor_prediction in OverallConstructorPrediction.objects.all():
              score = conn.zscore("ranks", constructor_prediction.user.username)
              if not score:
                  score = 0
              conn.zadd("ranks",
                        constructor_prediction.user.username,
                        constructor_prediction.score + score)
  
subject: Remove all scores before populating the sorted set.