修改判断数据库离线逻辑为：访问失败后，重试6次后发送错误短信。

Models/TimerClass.cs

@@ -20,6 +20,8 @@ namespace AutoNotificatPhone.Models
         // 消息控制器实例
         private readonly CallAndMsgController _callAndMsgController = new();
         private readonly IConfiguration _configuration;
+        // Kafka数据库连接失败累计次数
+        private int _kafkaDbConnectionAlertCount = 0;
 
         public TimerClass(IConfiguration configuration)
         {
@@ -555,12 +557,20 @@ namespace AutoNotificatPhone.Models
         /// </summary>
         private void ExecuteKafkaDbConnectionAlert()
         {
+            _kafkaDbConnectionAlertCount++;
+            if (_kafkaDbConnectionAlertCount < 8)
+            {
+                return;
+            }
+
             SendAlert(
                 smsContent: "[BLV运维提示] 数据库连接失败！",
                 callContent: "[BLV运维提示] 数据库连接失败",
                 alertType: "BLS-数据库连接警报",
                 extendedDeadline: true
             );
+
+            _kafkaDbConnectionAlertCount = 0;
         }
 
         /// <summary>