feat: refresh accounts automatically every five minutes

backend/CONTRACT.md

@@ -80,7 +80,7 @@
 {timezone,theme,syncMinutes,retentionDays,beforeMinutes,notifyBefore,notifyAfter}
 ```
 
-任意非 `GET` 方法都按更新处理，前端使用 `PUT`；请求接受完整对象。`syncMinutes` 为 1–60，`retentionDays` 为 30–365，`beforeMinutes` 为 1–1440，时区必须能由 Go 加载；非法值返回 400。成功返回保存后的对象。
+任意非 `GET` 方法都按更新处理，前端使用 `PUT`；请求接受完整对象。`syncMinutes` 为兼容旧客户端保留的字段，服务端始终按 5 分钟自动同步并返回 `5`；`retentionDays` 为 30–365，`beforeMinutes` 为 1–1440，时区必须能由 Go 加载；非法值返回 400。成功返回保存后的对象。
 
 ### SMTP
 

backend/internal/app/api.go

@@ -408,9 +408,9 @@ func (a *App) logout(w http.ResponseWriter, r *http.Request) {
 func (a *App) general() GeneralSettings {
 	g := defaults()
 	a.store.GetJSON("general", &g)
-	if g.SyncMinutes < 1 {
-		g.SyncMinutes = 5
-	}
+	// Keep the legacy field in the response for old clients, but automatic
+	// account synchronization is intentionally fixed at five minutes.
+	g.SyncMinutes = automaticSyncMinutes
 	if g.RetentionDays < 1 {
 		g.RetentionDays = 90
 	}
@@ -430,6 +430,7 @@ func (a *App) generalAPI(w http.ResponseWriter, r *http.Request) {
 		jsonOut(w, 400, map[string]string{"error": "无效时区"})
 		return
 	}
+	g.SyncMinutes = automaticSyncMinutes
 	_ = a.store.SetJSON("general", g)
 	jsonOut(w, 200, g)
 }

backend/internal/app/app.go

@@ -52,6 +52,8 @@ type accountRuntime struct {
 	stopped    bool
 }
 
+const automaticSyncInterval = time.Duration(automaticSyncMinutes) * time.Minute
+
 type codexClient interface {
 	Start(context.Context) error
 	Initialize(context.Context) error
@@ -267,17 +269,18 @@ func (a *App) syncAll(ctx context.Context) {
 	}
 }
 func (a *App) scheduler() {
-	t := time.NewTicker(time.Minute)
-	defer t.Stop()
+	maintenanceTicker := time.NewTicker(time.Minute)
+	syncTicker := time.NewTicker(automaticSyncInterval)
+	defer maintenanceTicker.Stop()
+	defer syncTicker.Stop()
 	for {
 		select {
 		case <-a.ctx.Done():
 			return
-		case <-t.C:
+		case <-syncTicker.C:
+			a.syncAll(context.Background())
+		case <-maintenanceTicker.C:
 			g := a.general()
-			if time.Now().Unix()%(int64(g.SyncMinutes)*60) < 60 {
-				a.syncAll(context.Background())
-			}
 			_, _ = a.store.Cleanup(g.RetentionDays)
 			go a.processReminders()
 		}

backend/internal/app/runtime_test.go

@@ -349,6 +349,19 @@ func TestPeakDailyTokensUsesOnlyTheCurrentTokenCycle(t *testing.T) {
 	}
 }
 
+func TestAutomaticSyncIntervalIsFixedAtFiveMinutes(t *testing.T) {
+	a := newReminderTestApp(t)
+	if err := a.store.SetJSON("general", GeneralSettings{SyncMinutes: 60, RetentionDays: 90, BeforeMinutes: 30}); err != nil {
+		t.Fatal(err)
+	}
+	if got := a.general().SyncMinutes; got != automaticSyncMinutes {
+		t.Fatalf("sync minutes = %d; want %d", got, automaticSyncMinutes)
+	}
+	if automaticSyncInterval != 5*time.Minute {
+		t.Fatalf("automatic sync interval = %s; want 5m", automaticSyncInterval)
+	}
+}
+
 func TestFlattenLimitReadsAppServerWindowDuration(t *testing.T) {
 	var limit rawLimit
 	if err := json.Unmarshal([]byte(`{

backend/internal/app/types.go

@@ -9,6 +9,9 @@ type GeneralSettings struct {
 	NotifyBefore  bool   `json:"notifyBefore"`
 	NotifyAfter   bool   `json:"notifyAfter"`
 }
+
+const automaticSyncMinutes = 5
+
 type SMTPSettings struct {
 	Host       string `json:"host"`
 	Port       int    `json:"port"`
@@ -92,5 +95,5 @@ type Dashboard struct {
 }
 
 func defaults() GeneralSettings {
-	return GeneralSettings{Timezone: "UTC", Theme: "system", SyncMinutes: 5, RetentionDays: 90, BeforeMinutes: 30, NotifyBefore: true, NotifyAfter: true}
+	return GeneralSettings{Timezone: "UTC", Theme: "system", SyncMinutes: automaticSyncMinutes, RetentionDays: 90, BeforeMinutes: 30, NotifyBefore: true, NotifyAfter: true}
 }