fix: move rate limiter sleep outside lock to avoid blocking threads

Co-authored-by: aguzererler <6199053+aguzererler@users.noreply.github.com>

tradingagents/dataflows/alpha_vantage_common.py

@@ -97,14 +97,18 @@ def _rate_limited_request(function_name: str, params: dict, timeout: int = 30) -
 
     # Re-check and register under lock to avoid races where multiple
     # threads calculate similar sleep times and then all fire at once.
-    with _rate_lock:
-        now = _time.time()
-        _call_timestamps[:] = [t for t in _call_timestamps if now - t < 60]
-        if len(_call_timestamps) >= _RATE_LIMIT:
-            # Another thread filled the window while we slept — wait again
-            extra_sleep = 60 - (now - _call_timestamps[0]) + 0.1
-            _time.sleep(extra_sleep)
-        _call_timestamps.append(_time.time())
+    while True:
+        with _rate_lock:
+            now = _time.time()
+            _call_timestamps[:] = [t for t in _call_timestamps if now - t < 60]
+            if len(_call_timestamps) >= _RATE_LIMIT:
+                # Another thread filled the window while we slept — wait again
+                extra_sleep = 60 - (now - _call_timestamps[0]) + 0.1
+            else:
+                _call_timestamps.append(_time.time())
+                break
+        # Sleep outside the lock to avoid blocking other threads
+        _time.sleep(extra_sleep)
 
 
     return _make_api_request(function_name, params, timeout=timeout)