diff --git a/CHANGELOG.md b/CHANGELOG.md
index 404b5f0b..796a107d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,7 @@ All notable changes to this project will be documented in this file.
 
 - Extended OrgStructureCache TTL from 10 to 30 minutes (reduce cleanup frequency)
 - Added OrgStructureCache.destroy() in graceful shutdown handler
+- Changed LogMemoryStore from active refresh (setInterval) to passive refresh on-access (60 min TTL)
 
 ### ⚙️ Miscellaneous Tasks
 
diff --git a/docs/SUMMARY_OPTIMIZATION-fix-optimization.md b/docs/SUMMARY_OPTIMIZATION-fix-optimization.md
index 6d4907c7..d2be25e1 100644
--- a/docs/SUMMARY_OPTIMIZATION-fix-optimization.md
+++ b/docs/SUMMARY_OPTIMIZATION-fix-optimization.md
@@ -104,15 +104,17 @@ class LogMemoryStore {
     profileCache: Map<string, Profile>,      // keycloak → Profile
     rootIdCache: Map<string, string>,        // profileId → rootId
   };
-  private readonly REFRESH_INTERVAL = 10 * 60 * 1000; // 10 นาที
+  private readonly CACHE_TTL = 60 * 60 * 1000; // 60 นาที
 }
 ```
 
 **การทำงาน:**
-- Cache `currentRevision` ทุก 10 นาที
+- Passive cache refresh - ตรวจสอบและ refresh cache เมื่อมีการเข้าถึงข้อมูล (on-access)
+- หาก cache เก่าเกิน 60 นาที จะทำการ refresh อัตโนมัติ
 - Lazy load `profileCache` และ `rootIdCache` (โหลดเมื่อถูกเรียกใช้)
 - Method `getProfileByKeycloak()` - ดึง profile จาก cache หรือ database
 - Method `getRootIdByProfileId()` - ดึง rootId จาก cache หรือ database
+- ไม่มี setInterval (ลดการใช้งาน timer)
 
 #### 3.2 Log Middleware (`src/middlewares/logs.ts`)
 
diff --git a/src/utils/LogMemoryStore.ts b/src/utils/LogMemoryStore.ts
index 456c06c8..24e84f9e 100644
--- a/src/utils/LogMemoryStore.ts
+++ b/src/utils/LogMemoryStore.ts
@@ -17,10 +17,8 @@ class LogMemoryStore {
     rootIdCache: new Map(),
     updatedAt: new Date(),
   };
-  private readonly REFRESH_INTERVAL = 10 * 60 * 1000; // 10 minutes
-  private isRefreshing = false;
+  private readonly CACHE_TTL = 60 * 60 * 1000; // 60 minutes
   private isInitialized = false;
-  private refreshTimer: NodeJS.Timeout | null = null;
 
   constructor() {
     // ไม่ refresh ทันที - รอให้เรียก initialize() หลัง TypeORM ready
@@ -35,24 +33,15 @@ class LogMemoryStore {
 
     this.isInitialized = true;
     this.refreshCache();
-    this.refreshTimer = setInterval(() => {
-      this.refreshCache();
-    }, this.REFRESH_INTERVAL);
 
     console.log(
       "[LogMemoryStore] Initialized with",
-      this.REFRESH_INTERVAL / 1000,
-      "second refresh interval",
+      this.CACHE_TTL / 1000 / 60,
+      "minute TTL (passive cleanup on access)",
     );
   }
 
   private async refreshCache() {
-    if (this.isRefreshing) {
-      console.log("[LogMemoryStore] Already refreshing, skipping...");
-      return;
-    }
-
-    this.isRefreshing = true;
     try {
       // Refresh revision cache
       const repoRevision = AppDataSource.getRepository(OrgRevision);
@@ -72,12 +61,26 @@ class LogMemoryStore {
       console.log("[LogMemoryStore] Cache refreshed at", this.cache.updatedAt.toISOString());
     } catch (error) {
       console.error("[LogMemoryStore] Error refreshing cache:", error);
-    } finally {
-      this.isRefreshing = false;
+    }
+  }
+
+  // Check if cache is stale and refresh if needed
+  private async checkAndRefreshIfNeeded() {
+    const now = new Date();
+    const age = now.getTime() - this.cache.updatedAt.getTime();
+    if (age > this.CACHE_TTL) {
+      console.log(
+        "[LogMemoryStore] Cache is stale (age:",
+        Math.round(age / 1000 / 60),
+        "minutes), refreshing...",
+      );
+      await this.refreshCache();
     }
   }
 
   getCurrentRevision(): OrgRevision | null {
+    // Check for stale data (fire and forget)
+    this.checkAndRefreshIfNeeded();
     return this.cache.currentRevision;
   }
 
@@ -89,6 +92,9 @@ class LogMemoryStore {
    * Get Profile by keycloak ID with caching
    */
   async getProfileByKeycloak(keycloak: string): Promise<Profile | null> {
+    // Check for stale data
+    await this.checkAndRefreshIfNeeded();
+
     // Check cache first
     if (this.cache.profileCache.has(keycloak)) {
       return this.cache.profileCache.get(keycloak)!;
@@ -114,6 +120,9 @@ class LogMemoryStore {
   async getRootIdByProfileId(profileId: string | undefined): Promise<string | null> {
     if (!profileId) return null;
 
+    // Check for stale data
+    await this.checkAndRefreshIfNeeded();
+
     // Check cache first
     if (this.cache.rootIdCache.has(profileId)) {
       return this.cache.rootIdCache.get(profileId)!;
@@ -148,10 +157,8 @@ class LogMemoryStore {
 
   // สำหรับ shutdown
   destroy() {
-    if (this.refreshTimer) {
-      clearInterval(this.refreshTimer);
-      this.refreshTimer = null;
-    }
+    // No active timer to clear
+    console.log("[LogMemoryStore] Destroyed");
   }
 }