修正了程序，优化了目录

services/db.py

@@ -1,10 +1,10 @@
 from sqlalchemy.ext.asyncio import AsyncEngine, create_async_engine, AsyncSession
 from sqlalchemy.orm import sessionmaker
-from ..models.user import Base, User, UserRole
+from models.user import Base, User, UserRole
 from sqlalchemy import select
 from contextlib import asynccontextmanager
 from config import SYSTEM_ADMIN_CONFIG, DATABASE_CONFIG
-from user_services import get_password_hash
+from services.user import get_password_hash
 from typing import AsyncGenerator
 
 # 全局数据库引擎实例
@@ -44,8 +44,9 @@ async def init_db(engine: AsyncEngine):
         # 创建所有表
         await conn.run_sync(Base.metadata.create_all)
 
+    async with AsyncSession(engine) as session:
         # 检查系统管理员是否存在
-        result = await conn.execute(
+        result = await session.execute(
             select(User).where(User.role == UserRole.SYSTEM_ADMIN)
         )
         if not result.scalars().first():
@@ -56,8 +57,8 @@ async def init_db(engine: AsyncEngine):
                 role=UserRole.SYSTEM_ADMIN,
                 description=SYSTEM_ADMIN_CONFIG['description']
             )
-            conn.add(admin)
-            await conn.commit()
+            session.add(admin)
+            await session.commit()
 
 async def close_db_connection():
     """关闭数据库连接"""

services/user.py

@@ -7,7 +7,6 @@ from schemas.user import UserCreate, UserUpdate, UserResponse
 
 # 创建一个密码上下文对象，指定使用 bcrypt 加密算法
 pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
-
     
 async def create_user(session: AsyncSession, user_data: UserCreate) -> UserResponse:
     """创建用户"""
@@ -60,6 +59,9 @@ def verify_password(plain_password: str, hashed_password: str) -> bool:
     """验证输入的明文密码是否与存储的哈希密码匹配"""
     return pwd_context.verify(plain_password, hashed_password)
 
+def get_password_hash(password: str) -> str:
+    """生成使用 bcrypt 的密码哈希"""
+    return pwd_context.hash(password)
 
 async def authenticate_user(session: AsyncSession, username: str, password: str) -> Optional[UserResponse]:
     """验证用户登录"""