feat: high-concurrency userid hashing

utils/helpers.py

@@ -2,15 +2,25 @@ from decimal import Decimal, getcontext
 import hashlib
 
 import orjson as json
+from diskcache import Cache
 
 getcontext().prec = 28
 
+CACHE = Cache("target")
+
 
 def salted_hash_userid(user_id: int):
+    hex = CACHE.get(user_id)
+    if hex is not None:
+        return hex
+
     SALT = b"Lt2N5xgjJOqRsT5qVt7wWYw6SqOPZDI7"
 
     hash_uid = hashlib.sha256(f"{user_id}".encode("utf-8") + SALT)
-    return hash_uid.hexdigest()[:16]
+    result = hash_uid.hexdigest()[:16]
+
+    CACHE.add(user_id, result)
+    return result
 
 
 def dx_rating(difficulty: Decimal, achievement: int) -> int: