fixing DQ issues

middleware/rate_limiter.py

@@ -11,6 +11,7 @@ class RateLimiter:
     """In-memory rate limiter using sliding window"""
 
     def __init__(self):
+        """Class constructor."""
         # Dictionary to store request timestamps for each client
         self.clients: Dict[str, deque] = defaultdict(lambda: deque())
         self.cleanup_interval = 3600  # Clean up old entries every hour