diff --git a/packages/backend/src/core/FeaturedService.ts b/packages/backend/src/core/FeaturedService.ts
index 7ba707e9e1..9617f83880 100644
--- a/packages/backend/src/core/FeaturedService.ts
+++ b/packages/backend/src/core/FeaturedService.ts
@@ -35,16 +35,10 @@ export class FeaturedService {
 			`${name}:${currentWindow}`,
 			score,
 			element);
-
-		const TTL = await this.redisClient.ttl(`${name}:${currentWindow}`);
-		
-		if (TTL === -1) {
-			this.redisClient.expire(`${name}:${currentWindow}`,
-				(windowRange * 3) / 1000, // 1時間
-				//'NX', // "NX -- Set expiry only when the key has no expiry" = 有効期限がないときだけ設定
-			);
-		}
-		
+		redisTransaction.expire(
+			`${name}:${currentWindow}`,
+			(windowRange * 3) / 1000,
+			'NX'); // "NX -- Set expiry only when the key has no expiry" = 有効期限がないときだけ設定
 		await redisTransaction.exec();
 	}
 
diff --git a/packages/backend/src/core/HashtagService.ts b/packages/backend/src/core/HashtagService.ts
index cc5ce4e964..d378999907 100644
--- a/packages/backend/src/core/HashtagService.ts
+++ b/packages/backend/src/core/HashtagService.ts
@@ -176,30 +176,20 @@ export class HashtagService {
 
 		// チャート用
 		redisPipeline.pfadd(`hashtagUsers:${hashtag}:${window}`, userId);
+		redisPipeline.expire(`hashtagUsers:${hashtag}:${window}`,
+			60 * 60 * 24 * 3, // 3日間
+			'NX', // "NX -- Set expiry only when the key has no expiry" = 有効期限がないときだけ設定
+		);
 
 		// ユニークカウント用
 		// TODO: Bloom Filter を使うようにしても良さそう
 		redisPipeline.sadd(`hashtagUsers:${hashtag}`, userId);
+		redisPipeline.expire(`hashtagUsers:${hashtag}`,
+			60 * 60, // 1時間
+			'NX', // "NX -- Set expiry only when the key has no expiry" = 有効期限がないときだけ設定
+		);
 
-		await redisPipeline.exec();
-
-		const TTL = await this.redisClient.ttl(`hashtagUsers:${hashtag}`);
-		
-		if (TTL === -1) {
-			this.redisClient.expire(`hashtagUsers:${hashtag}`,
-				60 * 60, // 1時間
-				//'NX', // "NX -- Set expiry only when the key has no expiry" = 有効期限がないときだけ設定
-			);
-		}
-
-		const TTLwindow = await this.redisClient.ttl(`hashtagUsers:${hashtag}:${window}`);
-
-		if (TTLwindow === -1) {
-			this.redisClient.expire(`hashtagUsers:${hashtag}:${window}`,
-				60 * 60 * 24 * 3, // 3日間
-				//'NX', // "NX -- Set expiry only when the key has no expiry" = 有効期限がないときだけ設定
-			);
-		}
+		redisPipeline.exec();
 	}
 
 	@bindThis