blank image issue on multiple req

controller.py

@@ -1,4 +1,5 @@
 # Import necessary modules
+from concurrent.futures import ProcessPoolExecutor
 import os
 import asyncio
 import threading
@@ -567,43 +568,7 @@ def handle_out_of_range_float(value):
     
         
 
-        
-
-
-import os
-import asyncio
-import threading
-import uuid
-from fastapi import FastAPI, HTTPException, Header
-from fastapi.responses import FileResponse
-from urllib.parse import unquote
-from pydantic import BaseModel
-from concurrent.futures import ProcessPoolExecutor
-import matplotlib.pyplot as plt
-import matplotlib
-import pandas as pd
-import numpy as np
-import seaborn as sns
-
-# Import your custom modules (assumed available)
-from csv_service import clean_data, extract_chart_filenames
-from langchain_experimental.tools import PythonAstREPLTool
-from langchain_experimental.agents import create_pandas_dataframe_agent
-from langchain_groq import ChatGroq
-from util_service import _prompt_generator, process_answer
-from intitial_q_handler import if_initial_chart_question
-
-# Use non-interactive backend
-matplotlib.use('Agg')
 
-# FastAPI app initialization
-app = FastAPI()
-
-# Environment variables and configuration
-import os
-groq_api_keys = os.getenv("GROQ_API_KEYS", "").split(",")
-model_name = os.getenv("GROQ_LLM_MODEL")
-image_file_path = os.getenv("IMAGE_FILE_PATH")  # e.g. "/app/generated_charts"
 
 # Global locks for key rotation (chart endpoints)
 current_groq_chart_key_index = 0