diff --git a/backend/app/api/v1/module_ai/chat/controller.py b/backend/app/api/v1/module_ai/chat/controller.py
index cc56002..86e44ea 100644
--- a/backend/app/api/v1/module_ai/chat/controller.py
+++ b/backend/app/api/v1/module_ai/chat/controller.py
@@ -9,7 +9,7 @@ from redis.asyncio import Redis
 from app.common.response import ResponseSchema, SuccessResponse
 from app.core.base_schema import AuthSchema, PaginationQueryParam
 from app.core.database import async_db_session
-from app.core.dependencies import AuthPermission, _authenticate, redis_getter
+from app.core.dependencies import AuthPermission, _authenticate, require_redis
 from app.core.exceptions import CustomException
 from app.core.logger import logger
 from app.core.router_class import OperationLogRoute
@@ -110,7 +110,7 @@ async def ai_chat_controller(
 
 @ChatRouter.get("/model", summary="获取 AI 模型配置列表", response_model=ResponseSchema[AiModelConfigListResponse])
 async def list_model_config_controller(
-    redis: Annotated[Redis, Depends(redis_getter)],
+    redis: Annotated[Redis, Depends(require_redis)],
     auth: Annotated[AuthSchema, Security(AuthPermission(["module_ai:chat:query"]))],
 ) -> JSONResponse:
     service = AiModelConfigService(auth, redis)
@@ -120,7 +120,7 @@ async def list_model_config_controller(
 
 @ChatRouter.post("/model", status_code=status.HTTP_201_CREATED, summary="新增一个 AI 模型配置", response_model=ResponseSchema[dict[str, Any]])
 async def create_model_config_controller(
-    redis: Annotated[Redis, Depends(redis_getter)],
+    redis: Annotated[Redis, Depends(require_redis)],
     auth: Annotated[AuthSchema, Security(AuthPermission(["module_ai:chat:update"]))],
     data: Annotated[AiModelConfigUpdateSchema, Body(description="模型配置参数")],
 ) -> JSONResponse:
@@ -132,7 +132,7 @@ async def create_model_config_controller(
 
 @ChatRouter.put("/model/{config_id}", summary="更新指定 ID 的 AI 模型配置", response_model=ResponseSchema[dict[str, Any]])
 async def update_model_config_controller(
-    redis: Annotated[Redis, Depends(redis_getter)],
+    redis: Annotated[Redis, Depends(require_redis)],
     auth: Annotated[AuthSchema, Security(AuthPermission(["module_ai:chat:update"]))],
     config_id: Annotated[str, Path(description="配置项 ID")],
     data: Annotated[AiModelConfigUpdateSchema, Body(description="模型配置参数")],
@@ -145,7 +145,7 @@ async def update_model_config_controller(
 
 @ChatRouter.delete("/model/{config_id}", summary="删除指定 ID 的 AI 模型配置", response_model=ResponseSchema[None])
 async def delete_model_config_controller(
-    redis: Annotated[Redis, Depends(redis_getter)],
+    redis: Annotated[Redis, Depends(require_redis)],
     auth: Annotated[AuthSchema, Security(AuthPermission(["module_ai:chat:update"]))],
     config_id: Annotated[str, Path(description="配置项 ID")],
 ) -> JSONResponse:
@@ -156,7 +156,7 @@ async def delete_model_config_controller(
 
 @ChatRouter.post("/model/{config_id}/activate", summary="切换激活的 AI 模型配置", response_model=ResponseSchema[None])
 async def activate_model_config_controller(
-    redis: Annotated[Redis, Depends(redis_getter)],
+    redis: Annotated[Redis, Depends(require_redis)],
     auth: Annotated[AuthSchema, Security(AuthPermission(["module_ai:chat:update"]))],
     config_id: Annotated[str, Path(description="配置项 ID；传 __default__ 使用系统默认")],
 ) -> JSONResponse:
diff --git a/backend/app/api/v1/module_monitor/cache/controller.py b/backend/app/api/v1/module_monitor/cache/controller.py
index f6fa559..d2ec132 100644
--- a/backend/app/api/v1/module_monitor/cache/controller.py
+++ b/backend/app/api/v1/module_monitor/cache/controller.py
@@ -6,7 +6,7 @@ from redis.asyncio.client import Redis
 
 from app.api.v1.module_monitor.cache.schema import CacheInfoSchema, CacheMonitorSchema
 from app.common.response import ResponseSchema, SuccessResponse
-from app.core.dependencies import AuthPermission, redis_getter
+from app.core.dependencies import AuthPermission, require_redis
 from app.core.router_class import OperationLogRoute
 
 from .service import CacheService
@@ -16,7 +16,7 @@ CacheRouter = APIRouter(route_class=OperationLogRoute, prefix="/cache", tags=["
 
 @CacheRouter.get("/info", summary="获取缓存监控信息", response_model=ResponseSchema[CacheMonitorSchema], dependencies=[Security(AuthPermission(["module_monitor:cache:query"]))])
 async def get_monitor_cache_info_controller(
-    redis: Annotated[Redis, Depends(redis_getter)],
+    redis: Annotated[Redis, Depends(require_redis)],
 ) -> JSONResponse:
     result = await CacheService.get_monitor_statistical_info(redis=redis)
     return SuccessResponse(data=result, msg="获取缓存监控信息成功")
@@ -29,7 +29,7 @@ async def get_monitor_cache_name_controller() -> JSONResponse:
 
 
 @CacheRouter.get("/get/keys/{cache_name}", summary="获取缓存键名列表", response_model=ResponseSchema[list[CacheInfoSchema]], dependencies=[Security(AuthPermission(["module_monitor:cache:query"]))])
-async def get_monitor_cache_key_controller(cache_name: Annotated[str, Path(description="缓存名称")], redis: Annotated[Redis, Depends(redis_getter)]) -> JSONResponse:
+async def get_monitor_cache_key_controller(cache_name: Annotated[str, Path(description="缓存名称")], redis: Annotated[Redis, Depends(require_redis)]) -> JSONResponse:
     result = await CacheService.get_monitor_cache_keys(redis=redis, cache_name=cache_name)
     return SuccessResponse(data=result, msg=f"获取缓存{cache_name}的键名列表成功")
 
@@ -38,27 +38,27 @@ async def get_monitor_cache_key_controller(cache_name: Annotated[str, Path(descr
 async def get_monitor_cache_value_controller(
     cache_name: Annotated[str, Path(description="缓存名称")],
     cache_key: Annotated[str, Path(description="缓存键名")],
-    redis: Annotated[Redis, Depends(redis_getter)],
+    redis: Annotated[Redis, Depends(require_redis)],
 ) -> JSONResponse:
     result = await CacheService.get_monitor_cache_value(redis=redis, cache_name=cache_name, cache_key=cache_key)
     return SuccessResponse(data=result, msg=f"获取缓存{cache_name}:{cache_key}的值成功")
 
 
 @CacheRouter.delete("/delete/name/{cache_name}", summary="清除指定缓存名称的所有缓存", response_model=ResponseSchema[None], dependencies=[Security(AuthPermission(["module_monitor:cache:delete"]))])
-async def clear_monitor_cache_name_controller(cache_name: Annotated[str, Path(description="缓存名称")], redis: Annotated[Redis, Depends(redis_getter)]) -> JSONResponse:
+async def clear_monitor_cache_name_controller(cache_name: Annotated[str, Path(description="缓存名称")], redis: Annotated[Redis, Depends(require_redis)]) -> JSONResponse:
     result = await CacheService.clear_monitor_cache_by_name(redis=redis, cache_name=cache_name)
     return SuccessResponse(msg=f"{cache_name}对应键值清除成功", data=result)
 
 
 @CacheRouter.delete("/delete/key/{cache_key}", summary="清除指定缓存键", response_model=ResponseSchema[None], dependencies=[Security(AuthPermission(["module_monitor:cache:delete"]))])
-async def clear_monitor_cache_key_controller(cache_key: Annotated[str, Path(description="缓存键名")], redis: Annotated[Redis, Depends(redis_getter)]) -> JSONResponse:
+async def clear_monitor_cache_key_controller(cache_key: Annotated[str, Path(description="缓存键名")], redis: Annotated[Redis, Depends(require_redis)]) -> JSONResponse:
     result = await CacheService.clear_monitor_cache_by_key(redis=redis, cache_key=cache_key)
     return SuccessResponse(msg=f"{cache_key}清除成功", data=result)
 
 
 @CacheRouter.delete("/clear", summary="清除所有缓存", response_model=ResponseSchema[None], dependencies=[Security(AuthPermission(["module_monitor:cache:delete"]))])
 async def clear_monitor_cache_all_controller(
-    redis: Annotated[Redis, Depends(redis_getter)],
+    redis: Annotated[Redis, Depends(require_redis)],
 ) -> JSONResponse:
     result = await CacheService.clear_monitor_cache_all(redis=redis)
     return SuccessResponse(msg="所有缓存清除成功", data=result)
diff --git a/backend/app/api/v1/module_monitor/online/controller.py b/backend/app/api/v1/module_monitor/online/controller.py
index 18b11e2..50fb4d3 100644
--- a/backend/app/api/v1/module_monitor/online/controller.py
+++ b/backend/app/api/v1/module_monitor/online/controller.py
@@ -8,7 +8,7 @@ from sqlalchemy.ext.asyncio import AsyncSession
 from app.common.request import PaginationService
 from app.common.response import ResponseSchema, SuccessResponse
 from app.core.base_schema import AuthSchema, PaginationQueryParam
-from app.core.dependencies import AuthPermission, db_getter, get_current_user, redis_getter
+from app.core.dependencies import AuthPermission, db_getter, get_current_user, require_redis
 from app.core.router_class import OperationLogRoute
 
 from .schema import DashboardStatsSchema, OnlineOutSchema, OnlineQueryParam
@@ -19,7 +19,7 @@ OnlineRouter = APIRouter(route_class=OperationLogRoute, prefix="/online", tags=[
 
 @OnlineRouter.get("/list", summary="获取在线用户列表", response_model=ResponseSchema[list[OnlineOutSchema]], dependencies=[Security(AuthPermission(["module_monitor:online:query"]))])
 async def get_online_list_controller(
-    redis: Annotated[Redis, Depends(redis_getter)],
+    redis: Annotated[Redis, Depends(require_redis)],
     page: Annotated[PaginationQueryParam, Depends()],
     search: Annotated[OnlineQueryParam, Query()],
 ) -> JSONResponse:
@@ -34,7 +34,7 @@ async def get_online_list_controller(
 
 @OnlineRouter.get("/current", summary="获取当前用户的在线会话", response_model=ResponseSchema[list[OnlineOutSchema]], dependencies=[Depends(get_current_user)])
 async def get_current_online_controller(
-    redis: Annotated[Redis, Depends(redis_getter)],
+    redis: Annotated[Redis, Depends(require_redis)],
     auth: Annotated[AuthSchema, Depends(get_current_user)],
 ) -> JSONResponse:
     sessions = await OnlineService.get_current_user_sessions(redis=redis, user_id=auth.user.id)
@@ -44,7 +44,7 @@ async def get_current_online_controller(
 @OnlineRouter.delete("/delete", summary="强制下线", response_model=ResponseSchema[None], dependencies=[Security(AuthPermission(["module_monitor:online:delete"]))])
 async def delete_online_controller(
     session_id: Annotated[str, Body(description="会话编号")],
-    redis: Annotated[Redis, Depends(redis_getter)],
+    redis: Annotated[Redis, Depends(require_redis)],
 ) -> JSONResponse:
     await OnlineService.delete_online(redis=redis, session_id=session_id)
     return SuccessResponse(msg="强制下线成功")
@@ -52,7 +52,7 @@ async def delete_online_controller(
 
 @OnlineRouter.delete("/clear", summary="清除所有在线用户", response_model=ResponseSchema[None], dependencies=[Security(AuthPermission(["module_monitor:online:delete"]))])
 async def clear_online_controller(
-    redis: Annotated[Redis, Depends(redis_getter)],
+    redis: Annotated[Redis, Depends(require_redis)],
 ) -> JSONResponse:
     await OnlineService.clear_online(redis=redis)
     return SuccessResponse(msg="清除所有在线用户成功")
@@ -61,7 +61,7 @@ async def clear_online_controller(
 @OnlineRouter.get("/stats", summary="获取仪表盘统计数据", response_model=ResponseSchema[DashboardStatsSchema])
 async def get_dashboard_stats_controller(
     db: Annotated[AsyncSession, Depends(db_getter)],
-    redis: Annotated[Redis, Depends(redis_getter)],
+    redis: Annotated[Redis, Depends(require_redis)],
     _auth: Annotated[AuthSchema, Security(AuthPermission(["module_monitor:dashboard:query"]))],
 ) -> JSONResponse:
     data = await OnlineService.get_dashboard_stats(db=db, redis=redis)
diff --git a/backend/app/api/v1/module_system/auth/controller.py b/backend/app/api/v1/module_system/auth/controller.py
index 0ba45e8..6e6c9c0 100644
--- a/backend/app/api/v1/module_system/auth/controller.py
+++ b/backend/app/api/v1/module_system/auth/controller.py
@@ -30,7 +30,7 @@ from app.common.enums import EnvironmentEnum
 from app.common.response import ErrorResponse, RedirectContentResponse, ResponseSchema, SuccessResponse
 from app.config.setting import settings
 from app.core.base_schema import JWTOutSchema
-from app.core.dependencies import db_getter, get_current_user, redis_getter
+from app.core.dependencies import db_getter, get_current_user, redis_getter, require_redis
 from app.core.exceptions import CustomException
 from app.core.logger import logger
 from app.core.redis_crud import RedisCURD
@@ -90,7 +90,7 @@ async def get_new_token_controller(
 
 @AuthRouter.get("/captcha/get", summary="获取验证码", response_model=ResponseSchema[CaptchaOutSchema])
 async def get_captcha_for_login_controller(
-    redis: Annotated[Redis, Depends(redis_getter)],
+    redis: Annotated[Redis, Depends(require_redis)],
 ) -> JSONResponse:
     captcha = await CaptchaService.get_captcha(redis=redis)
     return SuccessResponse(data=captcha, msg="获取验证码成功")
@@ -112,7 +112,7 @@ async def get_login_default_controller() -> JSONResponse:
 
 @AuthRouter.post("/captcha/slider/complete", summary="滑块验证完成", response_model=ResponseSchema[SliderCompleteOutSchema])
 async def slider_complete_controller(
-    redis: Annotated[Redis, Depends(redis_getter)],
+    redis: Annotated[Redis, Depends(require_redis)],
     body: SliderCompleteSchema,
 ) -> JSONResponse:
     result = await CaptchaService.slider_complete(redis=redis, captcha_key=body.captcha_key)
diff --git a/backend/app/core/dependencies.py b/backend/app/core/dependencies.py
index 1fe465f..992768e 100644
--- a/backend/app/core/dependencies.py
+++ b/backend/app/core/dependencies.py
@@ -1,6 +1,6 @@
 import json
 from collections.abc import AsyncGenerator
-from typing import Any
+from typing import Annotated, Any
 
 from fastapi import Depends, Request
 from redis.asyncio.client import Redis
@@ -39,12 +39,12 @@ async def redis_getter(request: Request) -> Redis:
     return request.app.state.redis
 
 
-def require_redis(redis: Redis | None) -> Redis:
+async def require_redis(redis: Annotated[Redis | None, Depends(redis_getter)]) -> Redis:
     """Redis 不可用时显式 503（存储类接口守卫）。
 
-    Redis 是认证会话、AI 模型配置、在线监控与调度任务 jobstore 的唯一存储。
-    启动降级模式下这些接口无法提供服务，应明确返回 503，而非误导性的
-    401/500 或静默空数据。
+    Redis 是认证会话、AI 模型配置、在线监控存储的唯一存储（调度任务 jobstore 已落 PG）。
+    存储类接口应依赖本守卫（而非裸 redis_getter）：降级模式下明确返回 503，
+    而不是 500/401 或静默空数据；免认证接口（如验证码）读 Redis 时也由此兜底。
     """
     if redis is None:
         raise CustomException(