diff --git a/internal/mq/recurring_handler.go b/internal/mq/recurring_handler.go
index c6258e7..856c8d7 100644
--- a/internal/mq/recurring_handler.go
+++ b/internal/mq/recurring_handler.go
@@ -49,7 +49,7 @@ func (h *RecurringTransactionHandler) Handle(ctx context.Context, task *DelayedT
 	// 幂等性检查：防止同一笔交易重复执行
 	// 使用 Redis SETNX 锁，锁 24 小时（足以覆盖重试窗口）
 	// TaskID 本身包含 recurringID 和执行时间戳，是天然的幂等 Key
-	lockKey := fmt.Sprintf("novault:lock:recurring:%s", task.ID)
+	lockKey := GenerateLockKey(task.ID)
 	// 使用 TaskQueue 提供的公开方法获取锁
 	isNew, err := h.taskQueue.AcquireLock(ctx, lockKey, 24*time.Hour)
 	if err != nil {
diff --git a/internal/mq/task_queue.go b/internal/mq/task_queue.go
index e5ceb20..53d5820 100644
--- a/internal/mq/task_queue.go
+++ b/internal/mq/task_queue.go
@@ -18,6 +18,13 @@ const (
 	TaskTypeRecurringTransaction TaskType = "recurring_transaction"
 	// TaskTypeAllocationRule 分配规则执行任务
 	TaskTypeAllocationRule TaskType = "allocation_rule"
+
+	// Redis Key Prefixes
+	KeyPrefixDefault    = "novault:tasks"
+	KeySuffixDelayed    = ":delayed"
+	KeySuffixReady      = ":ready"
+	KeySuffixProcessing = ":processing"
+	KeyPrefixLock       = "novault:lock:"
 )
 
 // DelayedTask 延迟任务结构
@@ -50,17 +57,22 @@ type TaskQueue struct {
 // NewTaskQueue 创建任务队列实例
 func NewTaskQueue(client *redis.Client, keyPrefix string) *TaskQueue {
 	if keyPrefix == "" {
-		keyPrefix = "novault:tasks"
+		keyPrefix = KeyPrefixDefault
 	}
 	return &TaskQueue{
 		client:        client,
 		keyPrefix:     keyPrefix,
-		delayedKey:    keyPrefix + ":delayed",
-		readyKey:      keyPrefix + ":ready",
-		processingKey: keyPrefix + ":processing",
+		delayedKey:    keyPrefix + KeySuffixDelayed,
+		readyKey:      keyPrefix + KeySuffixReady,
+		processingKey: keyPrefix + KeySuffixProcessing,
 	}
 }
 
+// GenerateLockKey 生成分布式锁 Key
+func GenerateLockKey(taskID string) string {
+	return KeyPrefixLock + "recurring:" + taskID
+}
+
 // Schedule 调度延迟任务
 func (q *TaskQueue) Schedule(ctx context.Context, task *DelayedTask) error {
 	// 序列化任务