update modelforecast_chat

main.py

@@ -638,8 +638,8 @@ async def modelforecast_chat(
     if not user_token:
         raise HTTPException(status_code=401, detail="Missing Authorization Bearer token (dt+...)")
     df_records = await _fetch_url_to_records(data_url)
-    payload = {"df_forecast": df_records}
-    return await _forward("/modelforecast/", "POST", json_body=payload, user_token=user_token)
+    # Backend modelforecast expects the raw JSON array as body (single Body(...) param), not {"df_forecast": [...]}
+    return await _forward("/modelforecast/", "POST", json_body=df_records, user_token=user_token)
 
 
 @app.post("/modelfit-file/")