Update app.py

app.py

@@ -1,5 +1,5 @@
 from __future__ import annotations
-from fastapi import FastAPI, UploadFile, File, Body
+from fastapi import FastAPI, Body
 from fastapi.middleware.cors import CORSMiddleware
 from fastapi.responses import JSONResponse
 import pandas as pd
@@ -8,7 +8,6 @@ from typing import Dict, Any, List
 from data import append_events, read_events, aggregate
 from bandit import EmpiricalBayesHierarchicalThompson
 from causal import fit_uplift_binary
-from utils import dumps
 
 # Gradio を FastAPI にマウント
 from dashboard import build_ui