Add system

app.py

@@ -138,7 +138,7 @@ def run_model():
                     current = {}
             else:
                 current = {}
-            current[str(step_id)] += f": {msg}"
+            current[str(step_id)] = f"{msg}"
             with open(log_file_path, "w") as f:
                 json.dump(current, f, indent=2)