feat: 调整 nltk 的初始化时机

app/create_app.py

@@ -19,12 +19,12 @@ def create_app():
   @asynccontextmanager
   async def lifespan(app: FastAPI):
     print("lifespan：启动阶段")
+    await check_nltk()
     async_results = await asyncio.gather(
       asyncio.create_task(check_database_connection()),
       asyncio.create_task(check_postgres_connection()),
       asyncio.create_task(milvus_service.check_milvus_connection()),
       asyncio.create_task(redis_utils.check_redis_connection()),
-      asyncio.create_task(check_nltk()),
     )
     async_engine = async_results[0]
     yield

app/utils/db_utils.py

@@ -22,7 +22,8 @@ async_engine = AsyncEngine(create_engine(
   pool_size=5,  # 连接池保持的连接数
   max_overflow=10,  # 允许超过pool_size的最大连接数
   pool_timeout=30,  # 获取连接的超时时间(秒)
-  pool_recycle=300,  # 连接回收时间(秒)
+  pool_recycle=180,  # 连接回收时间(秒)
+  pool_pre_ping=True,  # 启用连接有效性检测
   echo=True,  # 启用SQL语句日志输出，便于开发调试
   future=True,  # 启用SQLAlchemy 2.0风格的未来模式API
 ))