系统诊断增加设备检测

common/msg_db_helper.py

@@ -80,6 +80,25 @@ class DBHelper:
         messages = cursor.fetchall()  # 结果：[(content, is_processed, create_time, last_modified), ...]
         conn.close()
         return messages[::-1]  # 反转后按时间正序排列
+    
+    def clean_expired_messages(self, days_to_keep=30):
+        """删除超过指定天数(默认30天, 一个月)的过期消息，并压缩数据库"""
+        from datetime import datetime, timedelta
+        # 计算过期时间（当前时间 - days_to_keep天）
+        expire_time = (datetime.now() - timedelta(days=days_to_keep)).strftime("%Y-%m-%d %H:%M:%S")
+        
+        conn = sqlite3.connect(self.db_name)
+        cursor = conn.cursor()
+        # 删除过期消息
+        cursor.execute('''
+            DELETE FROM messages 
+            WHERE create_time < ?
+        ''', (expire_time,))
+        conn.commit()
+        # 压缩数据库，释放删除后的空闲空间
+        cursor.execute("VACUUM")
+        conn.commit()
+        conn.close()
 
 
 if __name__ == "__main__":