diff --git a/backend/internal/config/config_test.go b/backend/internal/config/config_test.go
index 1ba6d053..4637989e 100644
--- a/backend/internal/config/config_test.go
+++ b/backend/internal/config/config_test.go
@@ -39,8 +39,8 @@ func TestLoadDefaultSchedulingConfig(t *testing.T) {
 	if cfg.Gateway.Scheduling.StickySessionMaxWaiting != 3 {
 		t.Fatalf("StickySessionMaxWaiting = %d, want 3", cfg.Gateway.Scheduling.StickySessionMaxWaiting)
 	}
-	if cfg.Gateway.Scheduling.StickySessionWaitTimeout != 45*time.Second {
-		t.Fatalf("StickySessionWaitTimeout = %v, want 45s", cfg.Gateway.Scheduling.StickySessionWaitTimeout)
+	if cfg.Gateway.Scheduling.StickySessionWaitTimeout != 120*time.Second {
+		t.Fatalf("StickySessionWaitTimeout = %v, want 120s", cfg.Gateway.Scheduling.StickySessionWaitTimeout)
 	}
 	if cfg.Gateway.Scheduling.FallbackWaitTimeout != 30*time.Second {
 		t.Fatalf("FallbackWaitTimeout = %v, want 30s", cfg.Gateway.Scheduling.FallbackWaitTimeout)
diff --git a/backend/internal/repository/scheduler_snapshot_outbox_integration_test.go b/backend/internal/repository/scheduler_snapshot_outbox_integration_test.go
new file mode 100644
index 00000000..e82d663f
--- /dev/null
+++ b/backend/internal/repository/scheduler_snapshot_outbox_integration_test.go
@@ -0,0 +1,81 @@
+//go:build integration
+
+package repository
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"github.com/Wei-Shaw/sub2api/internal/config"
+	"github.com/Wei-Shaw/sub2api/internal/service"
+	"github.com/stretchr/testify/require"
+)
+
+func TestSchedulerSnapshotOutboxReplay(t *testing.T) {
+	ctx := context.Background()
+	rdb := testRedis(t)
+	client := testEntClient(t)
+
+	_, _ = integrationDB.ExecContext(ctx, "TRUNCATE scheduler_outbox")
+
+	accountRepo := newAccountRepositoryWithSQL(client, integrationDB)
+	outboxRepo := NewSchedulerOutboxRepository(integrationDB)
+	cache := NewSchedulerCache(rdb)
+
+	cfg := &config.Config{
+		RunMode: config.RunModeStandard,
+		Gateway: config.GatewayConfig{
+			Scheduling: config.GatewaySchedulingConfig{
+				OutboxPollIntervalSeconds: 1,
+				FullRebuildIntervalSeconds: 0,
+				DbFallbackEnabled:          true,
+			},
+		},
+	}
+
+	account := &service.Account{
+		Name:        "outbox-replay-" + time.Now().Format("150405.000000"),
+		Platform:    service.PlatformOpenAI,
+		Type:        service.AccountTypeAPIKey,
+		Status:      service.StatusActive,
+		Schedulable: true,
+		Concurrency: 3,
+		Priority:    1,
+		Credentials: map[string]any{},
+		Extra:       map[string]any{},
+	}
+	require.NoError(t, accountRepo.Create(ctx, account))
+
+	svc := service.NewSchedulerSnapshotService(cache, outboxRepo, accountRepo, nil, cfg)
+	svc.Start()
+	t.Cleanup(svc.Stop)
+
+	bucket := service.SchedulerBucket{GroupID: 0, Platform: service.PlatformOpenAI, Mode: service.SchedulerModeSingle}
+	require.Eventually(t, func() bool {
+		accounts, hit, err := cache.GetSnapshot(ctx, bucket)
+		if err != nil || !hit {
+			return false
+		}
+		for _, acc := range accounts {
+			if acc.ID == account.ID {
+				return true
+			}
+		}
+		return false
+	}, 5*time.Second, 100*time.Millisecond)
+
+	require.NoError(t, accountRepo.UpdateLastUsed(ctx, account.ID))
+	updated, err := accountRepo.GetByID(ctx, account.ID)
+	require.NoError(t, err)
+	require.NotNil(t, updated.LastUsedAt)
+	expectedUnix := updated.LastUsedAt.Unix()
+
+	require.Eventually(t, func() bool {
+		cached, err := cache.GetAccount(ctx, account.ID)
+		if err != nil || cached == nil || cached.LastUsedAt == nil {
+			return false
+		}
+		return cached.LastUsedAt.Unix() == expectedUnix
+	}, 5*time.Second, 100*time.Millisecond)
+}
diff --git a/frontend/src/views/admin/SettingsView.vue b/frontend/src/views/admin/SettingsView.vue
index 890ba28c..d46c3329 100644
--- a/frontend/src/views/admin/SettingsView.vue
+++ b/frontend/src/views/admin/SettingsView.vue
@@ -183,23 +183,6 @@
                 v-if="streamTimeoutForm.enabled"
                 class="space-y-4 border-t border-gray-100 pt-4 dark:border-dark-700"
               >
-                <!-- Timeout Seconds -->
-                <div>
-                  <label class="mb-2 block text-sm font-medium text-gray-700 dark:text-gray-300">
-                    {{ t('admin.settings.streamTimeout.timeoutSeconds') }}
-                  </label>
-                  <input
-                    v-model.number="streamTimeoutForm.timeout_seconds"
-                    type="number"
-                    min="30"
-                    max="300"
-                    class="input w-32"
-                  />
-                  <p class="mt-1.5 text-xs text-gray-500 dark:text-gray-400">
-                    {{ t('admin.settings.streamTimeout.timeoutSecondsHint') }}
-                  </p>
-                </div>
-
                 <!-- Action -->
                 <div>
                   <label class="mb-2 block text-sm font-medium text-gray-700 dark:text-gray-300">
@@ -1000,7 +983,6 @@ const streamTimeoutLoading = ref(true)
 const streamTimeoutSaving = ref(false)
 const streamTimeoutForm = reactive({
   enabled: true,
-  timeout_seconds: 60,
   action: 'temp_unsched' as 'temp_unsched' | 'error' | 'none',
   temp_unsched_minutes: 5,
   threshold_count: 3,
@@ -1314,7 +1296,6 @@ async function saveStreamTimeoutSettings() {
   try {
     const updated = await adminAPI.settings.updateStreamTimeoutSettings({
       enabled: streamTimeoutForm.enabled,
-      timeout_seconds: streamTimeoutForm.timeout_seconds,
       action: streamTimeoutForm.action,
       temp_unsched_minutes: streamTimeoutForm.temp_unsched_minutes,
       threshold_count: streamTimeoutForm.threshold_count,