remove contest type

utils/constants.py

@@ -12,14 +12,8 @@ class ContestStatus(models.TextChoices):
     CONTEST_UNDERWAY = "0", "Underway"
 
 
-class ContestRuleType(models.TextChoices):
-    ACM = "ACM", "ACM"
-    OI = "OI", "OI"
-
-
 class CacheKey:
     waiting_queue = "waiting_queue"
-    contest_rank_cache = "contest_rank_cache"
     website_config = "website_config"
     problem_authors = "problem_authors"
     problem_tags = "problem_tags"