diff --git a/src/models/redis.js b/src/models/redis.js
index a4a03b10..4d62bda7 100644
--- a/src/models/redis.js
+++ b/src/models/redis.js
@@ -192,8 +192,8 @@ class RedisClient {
     cacheCreateTokens = 0,
     cacheReadTokens = 0,
     model = 'unknown',
-    ephemeral5mTokens = 0,  // 新增：5分钟缓存 tokens
-    ephemeral1hTokens = 0   // 新增：1小时缓存 tokens
+    ephemeral5mTokens = 0, // 新增：5分钟缓存 tokens
+    ephemeral1hTokens = 0 // 新增：1小时缓存 tokens
   ) {
     const key = `usage:${keyId}`
     const now = new Date()
diff --git a/src/services/apiKeyService.js b/src/services/apiKeyService.js
index 48759aa8..cf0d9e4a 100644
--- a/src/services/apiKeyService.js
+++ b/src/services/apiKeyService.js
@@ -484,12 +484,12 @@ class ApiKeyService {
       // 提取详细的缓存创建数据
       let ephemeral5mTokens = 0
       let ephemeral1hTokens = 0
-      
+
       if (usageObject.cache_creation && typeof usageObject.cache_creation === 'object') {
         ephemeral5mTokens = usageObject.cache_creation.ephemeral_5m_input_tokens || 0
         ephemeral1hTokens = usageObject.cache_creation.ephemeral_1h_input_tokens || 0
       }
-      
+
       // 记录API Key级别的使用统计 - 这个必须执行
       await redis.incrementTokenUsage(
         keyId,
@@ -499,8 +499,8 @@ class ApiKeyService {
         cacheCreateTokens,
         cacheReadTokens,
         model,
-        ephemeral5mTokens,  // 传递5分钟缓存 tokens
-        ephemeral1hTokens   // 传递1小时缓存 tokens
+        ephemeral5mTokens, // 传递5分钟缓存 tokens
+        ephemeral1hTokens // 传递1小时缓存 tokens
       )
 
       // 记录费用统计
diff --git a/src/utils/cacheMonitor.js b/src/utils/cacheMonitor.js
index ab24bdfc..ece5e478 100644
--- a/src/utils/cacheMonitor.js
+++ b/src/utils/cacheMonitor.js
@@ -81,7 +81,7 @@ class CacheMonitor {
 
     const totalRequests = stats.totalHits + stats.totalMisses
     stats.averageHitRate =
-      totalRequests > 0 ? ((stats.totalHits / totalRequests) * 100).toFixed(2) + '%' : '0%'
+      totalRequests > 0 ? `${((stats.totalHits / totalRequests) * 100).toFixed(2)}%` : '0%'
 
     return stats
   }
@@ -95,7 +95,7 @@ class CacheMonitor {
 
     for (const [name, monitor] of this.monitors) {
       try {
-        const cache = monitor.cache
+        const { cache } = monitor
         const beforeSize = cache.cache.size
 
         // 执行常规清理
@@ -251,8 +251,8 @@ class CacheMonitor {
   estimateMemoryUsage() {
     let totalBytes = 0
 
-    for (const [name, monitor] of this.monitors) {
-      const cache = monitor.cache.cache
+    for (const [, monitor] of this.monitors) {
+      const { cache } = monitor.cache
       for (const [key, item] of cache) {
         // 粗略估算：key 长度 + value 序列化长度
         totalBytes += key.length * 2 // UTF-16
@@ -275,7 +275,7 @@ class CacheMonitor {
     logger.error('🚨 EMERGENCY CLEANUP INITIATED')
 
     for (const [name, monitor] of this.monitors) {
-      const cache = monitor.cache
+      const { cache } = monitor
       const beforeSize = cache.cache.size
 
       // 清理一半的缓存项（LRU 会保留最近使用的）
diff --git a/src/utils/lruCache.js b/src/utils/lruCache.js
index 0fd5f008..993089ba 100644
--- a/src/utils/lruCache.js
+++ b/src/utils/lruCache.js
@@ -94,7 +94,7 @@ class LRUCache {
    * 清空缓存
    */
   clear() {
-    const size = this.cache.size
+    const { size } = this.cache
     this.cache.clear()
     this.hits = 0
     this.misses = 0