@router.on_event("shutdown")
    def router_shutdown() -> None:
        state.router_shutdown = True

    sub_router = APIRouter()

    @sub_router.on_event("startup")
    def sub_router_startup() -> None:
        state.sub_router_startup = True

    @sub_router.on_event("shutdown")
    def sub_router_shutdown() -> None:
        state.sub_router_shutdown = True

    router.include_router(sub_router)