feat: ruff'ed

config/models.py

@@ -8,7 +8,7 @@ class SingletonModel(models.Model):
         abstract = True
 
     def save(self, *args, **kwargs):
-        cache_key = f"{self._meta.model_name}_singleton_key"
+        cache_key = f'{self._meta.model_name}_singleton_key'
         self.pk = 1
         super(SingletonModel, self).save(*args, **kwargs)
 
@@ -21,7 +21,7 @@ class SingletonModel(models.Model):
 
     @classmethod
     def load(cls):
-        cache_key = f"{cls._meta.model_name}_singleton_key"
+        cache_key = f'{cls._meta.model_name}_singleton_key'
         data = cache.get(cache_key)
         if not data:
             instance, created = cls.objects.get_or_create(pk=1)