1.添加定时任务(每天凌晨四点处理redis记录的删除，存储入mysql持久化操作)

2.修复了prompt中没有用户输入信息的bug
3.优化了更新类接口代码(删除了db.add()代码)

app/__init__.py

@@ -1,12 +1,16 @@
 from fastapi import FastAPI, Depends
 from fastapi.middleware.cors import CORSMiddleware
+from contextlib import asynccontextmanager
 from sqlalchemy import create_engine
+from apscheduler.schedulers.asyncio import AsyncIOScheduler
+from apscheduler.triggers.cron import CronTrigger
 from .models import Base
 from .routes.character_route import router as character_router
 from .routes.user_route import router as user_router
 from .routes.session_route import router as session_router
 from .routes.chat_route import router as chat_router
 from .dependencies.logger import get_logger
+from .background_tasks import updating_redis_cache
 from config import get_config
 
 
@@ -28,8 +32,20 @@ logger.info("数据库初始化完成")
 #------------------------------------------------------
 
 
+#--------------------设置定时任务-----------------------
+scheduler = AsyncIOScheduler()
+scheduler.add_job(updating_redis_cache, CronTrigger.from_crontab("0 4 * * *"))
+@asynccontextmanager
+async def lifespan(app:FastAPI):
+    scheduler.start() #启动定时任务
+    yield
+    scheduler.shutdown() #关闭定时任务
+logger.info("定时任务初始化完成")
+#------------------------------------------------------
+
+
 #--------------------创建FastAPI实例--------------------
-app = FastAPI()
+app = FastAPI(lifespan=lifespan)
 logger.info("FastAPI实例创建完成")
 #------------------------------------------------------
 
@@ -42,6 +58,7 @@ app.include_router(chat_router)
 logger.info("路由初始化完成")
 #-------------------------------------------------------
 
+
 #-------------------设置跨域中间件-----------------------
 app.add_middleware(
     CORSMiddleware,