diff --git a/api/timer/trigger.go b/api/timer/trigger.go
index b7f984f..9f648b6 100644
--- a/api/timer/trigger.go
+++ b/api/timer/trigger.go
@@ -57,11 +57,14 @@ func HandleTriggerTimer(c *gin.Context) {
 	defer cancel()
 
 	// 并发执行所有规则，收集失败信息
+	//
+	// fails 必须初始化为空切片：nil 切片会被序列化成 JSON null，
+	// 前端读 failed.length 时会抛异常，把全部成功误报成触发失败。
 	var (
-		wg    sync.WaitGroup
-		mu    sync.Mutex
-		fails []string
+		wg sync.WaitGroup
+		mu sync.Mutex
 	)
+	fails := []string{}
 	for i := range rules {
 		rule := rules[i]
 		wg.Add(1)
diff --git a/handler/logstore/logstore.go b/handler/logstore/logstore.go
index 654b049..66cba78 100644
--- a/handler/logstore/logstore.go
+++ b/handler/logstore/logstore.go
@@ -42,18 +42,23 @@ func trim(uid uint) {
 		return
 	}
 
-	var cutoff model.ExecutionLog
-	err = gormDB.Where("uid = ?", uid).
+	// 用 Find 而不是 First：日志没超出保留条数是常态，
+	// First 找不到记录会返回 ErrRecordNotFound，每写一条日志都刷一行 gorm 警告。
+	var cutoff []model.ExecutionLog
+	if err := gormDB.Where("uid = ?", uid).
 		Order("id DESC").
 		Offset(config.LogRetainCount).
 		Limit(1).
-		First(&cutoff).Error
-	if err != nil {
+		Find(&cutoff).Error; err != nil {
+		log.Printf("清理执行日志失败: %v", err)
+		return
+	}
+	if len(cutoff) == 0 {
 		// 没有超出保留条数
 		return
 	}
 
-	if err := gormDB.Where("uid = ? AND id <= ?", uid, cutoff.ID).
+	if err := gormDB.Where("uid = ? AND id <= ?", uid, cutoff[0].ID).
 		Delete(&model.ExecutionLog{}).Error; err != nil {
 		log.Printf("清理执行日志失败: %v", err)
 	}
diff --git a/web/dist/.gitkeep b/web/dist/.gitkeep
deleted file mode 100644
index e69de29..0000000
diff --git a/web/frontend/src/views/TimersView.vue b/web/frontend/src/views/TimersView.vue
index 6e43ece..682eb42 100644
--- a/web/frontend/src/views/TimersView.vue
+++ b/web/frontend/src/views/TimersView.vue
@@ -147,12 +147,11 @@ async function trigger(timer: Timer) {
   triggeringId.value = timer.id
   try {
     const result = await timerApi.trigger(timer.id)
-    if (result.failed.length === 0) {
+    const failed = result.failed ?? []
+    if (failed.length === 0) {
       ElMessage.success(`已执行 ${result.total} 条规则，全部成功`)
     } else {
-      ElMessage.warning(
-        `已执行 ${result.total} 条规则，${result.failed.length} 条失败，详情见执行日志`,
-      )
+      ElMessage.warning(`已执行 ${result.total} 条规则，${failed.length} 条失败，详情见执行日志`)
     }
   } catch (error) {
     ElMessage.error(error instanceof ApiError ? error.message : '触发失败')