diff --git a/frontend/src/app/AppProviders.tsx b/frontend/src/app/AppProviders.tsx
index 562483a6..31ce7714 100644
--- a/frontend/src/app/AppProviders.tsx
+++ b/frontend/src/app/AppProviders.tsx
@@ -35,9 +35,16 @@ function AuthenticatedRuntime({ services }: { readonly services: AppServices })
       return;
     }
 
-    void services.runtime.start();
+    // 不 catch 的话，runtime.start() 里任何一个模块启动失败（哪怕只是某次原生
+    // 调用偶发抛错）都会变成静默的 unhandled rejection——用户看到的就是"提醒/
+    // 守护线程这次没起来"，没有任何日志能定位到具体是哪次启动失败的。
+    services.runtime.start().catch((error) => {
+      console.error('[app] runtime.start() failed', error);
+    });
     return () => {
-      void services.runtime.stop();
+      services.runtime.stop().catch((error) => {
+        console.error('[app] runtime.stop() failed', error);
+      });
     };
   }, [isAuthenticated, services]);
 
diff --git a/frontend/src/app/AppRoot.tsx b/frontend/src/app/AppRoot.tsx
index 0ccca12f..6834d61f 100644
--- a/frontend/src/app/AppRoot.tsx
+++ b/frontend/src/app/AppRoot.tsx
@@ -37,6 +37,13 @@ export function AppRoot({ services: providedServices }: { services?: AppServices
   const controller = services.auth.controller;
   const handlePermissionsUpdated = useCallback(() => {
     void services.reminder.rebuild();
+    // ReminderGuardCoordinator 冷启动时如果权限还没给，会跳过启动且不重试；
+    // schedules.refresh() 会顺带唤醒它订阅的 reconcile()，不用单独给协调器开端口。
+    // refresh() 内部要读 SQLite，可能因为瞬时的原生/数据库错误 reject——不 catch
+    // 的话这里又是一次静默 unhandled rejection，跟这个 PR 本身要修的问题一样。
+    services.schedules.refresh().catch((error) => {
+      console.error('[app] schedules.refresh() failed after a permission update', error);
+    });
   }, [services]);
   return (
     <AppProviders
@@ -243,7 +250,9 @@ function AuthenticatedScheduleRoute({
     }
     reminderState.attach(currentLoadState.repository, accountId);
     scheduleReader.attach(currentLoadState.repository, accountId);
-    void scheduleReader.refresh();
+    scheduleReader.refresh().catch((error) => {
+      console.error('[app] schedules.refresh() failed after SQLite became ready', error);
+    });
     return () => {
       scheduleReader.detach();
       reminderState.detach();
diff --git a/frontend/src/features/reminder/application/ReminderGuardCoordinator.ts b/frontend/src/features/reminder/application/ReminderGuardCoordinator.ts
index 86c621d9..a8986c35 100644
--- a/frontend/src/features/reminder/application/ReminderGuardCoordinator.ts
+++ b/frontend/src/features/reminder/application/ReminderGuardCoordinator.ts
@@ -128,7 +128,17 @@ export class ReminderGuardCoordinator {
     // 才需要）——上一版这里连后台权限一起卡，导致用户只给了"仅使用时允许"（没给
     // "始终允许"，这是安卓上很常见的选择）时，连时间型提醒的兜底轮询都启动不了，
     // 跟这条日程要不要用到位置完全没关系。
-    const { status: foreground } = await Location.getForegroundPermissionsAsync();
+    // 冷启动时原生模块可能还没链接完，这次调用偶尔会抛错——不兜住的话会一路
+    // 传出 reconcile()/start()，把整个 AppRuntime 启动流程炸掉（详见
+    // AppProviders.tsx 里 runtime.start() 未 catch 的说明），而不是仅仅这一次
+    // reconcile 失败。
+    let foreground: Location.PermissionStatus;
+    try {
+      ({ status: foreground } = await Location.getForegroundPermissionsAsync());
+    } catch (error) {
+      console.warn('[guard] getForegroundPermissionsAsync failed', error);
+      return;
+    }
     if (foreground !== 'granted') {
       console.warn('[guard] ensureLocationUpdates skipped: foreground permission not granted');
       return;
diff --git a/frontend/tests/unit/app/AppProviders.test.tsx b/frontend/tests/unit/app/AppProviders.test.tsx
index ee78370a..cec00af7 100644
--- a/frontend/tests/unit/app/AppProviders.test.tsx
+++ b/frontend/tests/unit/app/AppProviders.test.tsx
@@ -1,5 +1,5 @@
 import { describe, expect, it, jest } from '@jest/globals';
-import { render } from '@testing-library/react-native';
+import { render, waitFor } from '@testing-library/react-native';
 import type { PropsWithChildren } from 'react';
 
 import type { AppServices } from '../../../src/app/composition/createAppServices';
@@ -26,7 +26,10 @@ function createServices(): AppServices {
     reminder: { rebuild: jest.fn() },
     reminderPorts: { device: {} },
     alertDialog: {},
-    runtime: { start: jest.fn(), stop: jest.fn() },
+    runtime: {
+      start: jest.fn<() => Promise<void>>().mockResolvedValue(undefined),
+      stop: jest.fn<() => Promise<void>>().mockResolvedValue(undefined),
+    },
     protectedClient: {},
     scheduleView: {},
     webSocketClient: {},
@@ -74,4 +77,43 @@ describe('AppProviders', () => {
 
     expect(services.runtime.stop).toHaveBeenCalledTimes(1);
   });
+
+  it('logs instead of throwing an unhandled rejection when runtime.start() fails', async () => {
+    mockAuthStatus = 'authenticated';
+    const services = createServices();
+    const startError = new Error('module start failed');
+    (services.runtime.start as jest.Mock<() => Promise<void>>).mockRejectedValue(startError);
+    const errorSpy = jest.spyOn(console, 'error').mockImplementation(() => {});
+
+    render(
+      <AppProviders authController={{} as never} services={services}>
+        {null}
+      </AppProviders>,
+    );
+
+    await waitFor(() =>
+      expect(errorSpy).toHaveBeenCalledWith('[app] runtime.start() failed', startError),
+    );
+    errorSpy.mockRestore();
+  });
+
+  it('logs instead of throwing an unhandled rejection when runtime.stop() fails', async () => {
+    mockAuthStatus = 'authenticated';
+    const services = createServices();
+    const stopError = new Error('module stop failed');
+    (services.runtime.stop as jest.Mock<() => Promise<void>>).mockRejectedValue(stopError);
+    const errorSpy = jest.spyOn(console, 'error').mockImplementation(() => {});
+
+    const { unmount } = render(
+      <AppProviders authController={{} as never} services={services}>
+        {null}
+      </AppProviders>,
+    );
+    unmount();
+
+    await waitFor(() =>
+      expect(errorSpy).toHaveBeenCalledWith('[app] runtime.stop() failed', stopError),
+    );
+    errorSpy.mockRestore();
+  });
 });
diff --git a/frontend/tests/unit/app/AppRoot.test.tsx b/frontend/tests/unit/app/AppRoot.test.tsx
index 71221a31..0aa381db 100644
--- a/frontend/tests/unit/app/AppRoot.test.tsx
+++ b/frontend/tests/unit/app/AppRoot.test.tsx
@@ -451,20 +451,86 @@ describe('AppRoot', () => {
         return true;
       });
     const rebuild = jest.spyOn(services.reminder, 'rebuild').mockResolvedValue([]);
+    const refresh = jest.spyOn(services.schedules, 'refresh').mockResolvedValue(undefined);
 
     render(<AppRoot services={services} />);
 
     await screen.findByText('需要这些权限');
+    // DB ready 那条 effect 自己也会在挂载时 refresh() 一次；只关心权限授予
+    // 这次触发的那一下，把挂载阶段的调用先清掉。
+    refresh.mockClear();
     fireEvent.press(screen.getByTestId('permission-action-notifications'));
 
     await waitFor(() =>
       expect(screen.getByLabelText('进入 App').props.accessibilityState.disabled).toBe(false),
     );
     expect(rebuild).toHaveBeenCalledTimes(1);
+    // 冷启动权限没给时，守护线程的 reconcile() 会跳过启动且不重试；权限中途
+    // 被授予后必须有人把它叫醒，不然只能等下次重启才会再跑一次 reconcile()。
+    expect(refresh).toHaveBeenCalledTimes(1);
 
     fireEvent.press(screen.getByLabelText('进入 App'));
     await screen.findByText('日程日历');
   });
+
+  it('logs instead of throwing when schedules.refresh() fails after a permission grant', async () => {
+    const services = createController({
+      accountId: 'acc_001',
+      accessToken: 'opaque-token',
+      expiresAt: 200_000,
+      username: 'timeflow_user',
+    });
+    let status = {
+      platform: 'android' as const,
+      supported: true,
+      permissions: {
+        notifications: false,
+        exact_alarm: true,
+        overlay: true,
+        full_screen: true,
+        battery_optimization: true,
+        location_foreground: true,
+        location_background: true,
+        microphone: true,
+      },
+      background_execution: true,
+      oemGuidance: {
+        manufacturer: null,
+        autostartGuided: false,
+        backgroundPopupGuided: false,
+        lastOverlayFailed: false,
+      },
+    };
+    jest.spyOn(services.reminderPorts.device, 'getStatus').mockImplementation(async () => status);
+    jest
+      .spyOn(services.reminderPorts.device, 'requestPermission')
+      .mockImplementation(async (permission) => {
+        status = { ...status, permissions: { ...status.permissions, [permission]: true } };
+        return true;
+      });
+    jest.spyOn(services.reminder, 'rebuild').mockResolvedValue([]);
+    const refreshError = new Error('sqlite read failed');
+    const refresh = jest.spyOn(services.schedules, 'refresh').mockRejectedValue(refreshError);
+    const errorSpy = jest.spyOn(console, 'error').mockImplementation(() => {});
+
+    render(<AppRoot services={services} />);
+
+    await screen.findByText('需要这些权限');
+    refresh.mockClear();
+    fireEvent.press(screen.getByTestId('permission-action-notifications'));
+
+    await waitFor(() =>
+      expect(errorSpy).toHaveBeenCalledWith(
+        '[app] schedules.refresh() failed after a permission update',
+        refreshError,
+      ),
+    );
+    // 失败不能挡住用户继续走完权限流程。
+    await waitFor(() =>
+      expect(screen.getByLabelText('进入 App').props.accessibilityState.disabled).toBe(false),
+    );
+    errorSpy.mockRestore();
+  });
 });
 
 function createController(
diff --git a/frontend/tests/unit/features/reminder/application/ReminderGuardCoordinator.test.ts b/frontend/tests/unit/features/reminder/application/ReminderGuardCoordinator.test.ts
index 37e52609..fdae0eae 100644
--- a/frontend/tests/unit/features/reminder/application/ReminderGuardCoordinator.test.ts
+++ b/frontend/tests/unit/features/reminder/application/ReminderGuardCoordinator.test.ts
@@ -312,6 +312,20 @@ describe('ReminderGuardCoordinator', () => {
     expect(startUpdates).toHaveBeenCalledTimes(1);
   });
 
+  it('does not let a getForegroundPermissionsAsync failure reject start()', async () => {
+    getForeground.mockRejectedValue(new Error('boom'));
+    const reader = createReader([timeSchedule()]);
+    const coordinator = new ReminderGuardCoordinator({
+      schedules: reader,
+      handleLocation: jest.fn(async () => {}),
+    });
+
+    // 改之前：这次原生调用不兜错的话，start() 会直接 reject，把整个
+    // AppRuntime 的启动流程一起炸掉，而不是仅仅这次 reconcile 没启动成功。
+    await expect(coordinator.start()).resolves.toBeUndefined();
+    expect(startUpdates).not.toHaveBeenCalled();
+  });
+
   it('swallows a startLocationUpdatesAsync failure', async () => {
     startUpdates.mockRejectedValue(new Error('boom'));
     const reader = createReader([timeSchedule()]);