fix scheduler, add logging for grt free slots

app_context.py

@@ -1,9 +1,12 @@
-from flask import current_app
+from extensions import flask_app
 
 
 def with_app_context(func):
     def wrapper(*args, **kwargs):
-        with current_app.app_context():
+        if flask_app is None:
+            raise RuntimeError("Flask app is not initialized")
+
+        with flask_app.app_context():
             return func(*args, **kwargs)
 
     return wrapper