如何在SQLAlchemy & FastAPI中使用json.dumps删除json输出中的额外反斜杠？

from fastapi import FastAPI
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import Column, Integer, String
import json

SQLALCHEMY_DATABASE_URL = "sqlite:///./test.db"
engine = create_engine(SQLALCHEMY_DATABASE_URL)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
Base = declarative_base()

class User(Base):
    __tablename__ = "users"

    id = Column(Integer, primary_key=True, index=True)
    name = Column(String, index=True)
    email = Column(String, unique=True, index=True)
    password = Column(String)

app = FastAPI()

@app.get("/users/{user_id}")
def get_user(user_id: int):
    db = SessionLocal()
    user = db.query(User).filter(User.id == user_id).first()
    db.close()
    return json.dumps(user, default=str)

if __name__ == "__main__":
    import uvicorn
    uvicorn.run(app, host="0.0.0.0", port=8000)