diff --git a/message_report/process_message.py b/message_report/process_message.py
index 4c73779..29c0803 100644
--- a/message_report/process_message.py
+++ b/message_report/process_message.py
@@ -13,8 +13,11 @@ def process_message(message:WxMsg):
     current_date = datetime.now().strftime('%Y-%m-%d')
     # 生成Redis key
     key = f"{message.roomid}:{message.sender}:{current_date}:count"
+
     # 使用Redis哈希（或字符串）增加发言次数
     r.hincrby(key, 'count', 1)  # 这里使用哈希，但也可以考虑用字符串的INCR操作
+    # 设置时效为48小时
+    r.expire(key,86400*2)
     # 或者使用字符串：r.incr(key)  # 如果只存储一个整数值，字符串类型可能更简单
 
 
diff --git a/message_report/write_db.py b/message_report/write_db.py
index db23e0a..aaaf862 100644
--- a/message_report/write_db.py
+++ b/message_report/write_db.py
@@ -43,6 +43,7 @@ def generate_and_send_ranking(groupId,allContacts: dict):
     conn = sqlite3.connect('message_stats.db')
     cursor = conn.cursor()
 
+    yesterday = (datetime.now() - timedelta(days=1)).strftime('%Y-%m-%d')
     # 编写SQL查询来获取发言数量前20的用户
     query = """
       SELECT group_id,wx_id, COUNT(*) AS speech_count
@@ -59,7 +60,7 @@ def generate_and_send_ranking(groupId,allContacts: dict):
     results = cursor.fetchall()
 
     # 格式化输出字符串
-    ranking_str = "发言数量前20的用户排名:\n"
+    ranking_str = yesterday + "发言数量前20的用户排名:\n"
     for rank, (username, speech_count) in enumerate(results, start=1):
         ranking_str += f"{rank}. {allContacts[username]}: {speech_count} 次发言\n"