Update app.py

app.py

@@ -5,16 +5,20 @@ Overthinker — Gradio.Server Backend with SQLite Session Isolation + HF Trace U
 """
 
 import os
+import re
 import json
 import uuid
 import sqlite3
+import requests
+
 from pathlib import Path
 from typing import Optional, Dict, List, Any
 
 from gradio import Server
 from fastapi import HTTPException
 from starlette.responses import HTMLResponse, PlainTextResponse
-
+from datasets import Dataset, concatenate_datasets, load_dataset
+import pandas as pd
 # ---------------------------------------------------------------------------
 # Application Setup
 # ---------------------------------------------------------------------------
@@ -297,6 +301,7 @@ def call_api(prompt: str, system_prompt: str = "You are a helpful assistant that
             'Authorization': f'Bearer {OPENROUTER_API_KEY}',
             'Content-Type': 'application/json',
             'HTTP-Referer': 'http://localhost:7860',
+            'X-Title': 'Overthinker'
         }
         data = {
             'model': DEFAULT_MODEL,
@@ -326,7 +331,6 @@ def parse_json_response(text: str) -> Optional[dict]:
     if not text:
         return None
     text = text.strip()
-    import re
     text = re.sub(r'```json\s*', '', text)
     text = re.sub(r'```\s*', '', text)
     text = text.strip()
@@ -503,8 +507,7 @@ async def upload_trace(request: dict):
         raise HTTPException(status_code=404, detail="No tree found for this session.")
     
     try:
-        from datasets import Dataset, concatenate_datasets, load_dataset
-        import pandas as pd
+
         
         row = {
             'session_id': session_id,
@@ -575,7 +578,6 @@ async def export_path_md(request: dict):
 # Launch
 # ---------------------------------------------------------------------------
 if __name__ == "__main__":
-    import requests  # needed for sync calls inside async routes
     print(f"\U0001f9e0 Overthinker — SQLite Session Mode + HF Trace Upload on port {PORT}")
     print(f"\U0001f916 Model: {DEFAULT_MODEL}")
     print(f"\U0001f310 Open http://localhost:{PORT} in your browser")