CaiYouHui_backend/app/dependencies/database.py

# app/dependencies/database.py
from sqlalchemy.orm import Session
from contextlib import contextmanager
from typing import Generator

# ✅ 正确导入方式
from app.database import SessionLocal

def get_async_db() -> Generator[Session, None, None]:
    """数据库会话依赖注入"""
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()