fix: Cast user id to string before using it inside the flag

__init__.py

@@ -18,14 +18,15 @@ bp = Blueprint(directory_name, __name__, template_folder="templates")
 
 
 def create_flag_if_missing(challenge_id: int, user_id: int, flag_content: str):
-    flags = Flags.query.filter_by(id=challenge_id, data=user_id).all()
+    user_id_str = str(user_id)
+    flags = Flags.query.filter_by(id=challenge_id, data=user_id_str).all()
 
     if len(flags) == 0:
         new_flag = Flags(
             challenge_id=challenge_id,
             type="personal",
             content=flag_content,
-            data=user_id,
+            data=user_id_str,
         )
         db.session.add(new_flag)
         db.session.commit()