初步添加报警功能

DMS.Core/Models/AlarmHistory.cs

@@ -0,0 +1,71 @@
+using System;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace DMS.Core.Models
+{
+    /// <summary>
+    /// 报警历史记录实体
+    /// </summary>
+    public class AlarmHistory
+    {
+        /// <summary>
+        /// 主键ID
+        /// </summary>
+        [Key]
+        public int Id { get; set; }
+
+        /// <summary>
+        /// 变量ID
+        /// </summary>
+        public int VariableId { get; set; }
+
+        /// <summary>
+        /// 变量名称
+        /// </summary>
+        [MaxLength(100)]
+        public string VariableName { get; set; }
+
+        /// <summary>
+        /// 当前值
+        /// </summary>
+        public double CurrentValue { get; set; }
+
+        /// <summary>
+        /// 阈值
+        /// </summary>
+        public double ThresholdValue { get; set; }
+
+        /// <summary>
+        /// 报警类型 (High, Low, Deadband, BooleanChange)
+        /// </summary>
+        [MaxLength(50)]
+        public string AlarmType { get; set; }
+
+        /// <summary>
+        /// 报警消息
+        /// </summary>
+        public string Message { get; set; }
+
+        /// <summary>
+        /// 报警触发时间
+        /// </summary>
+        public DateTime Timestamp { get; set; }
+
+        /// <summary>
+        /// 是否已确认
+        /// </summary>
+        public bool IsAcknowledged { get; set; }
+
+        /// <summary>
+        /// 确认时间
+        /// </summary>
+        public DateTime? AcknowledgedAt { get; set; }
+
+        /// <summary>
+        /// 确认人
+        /// </summary>
+        [MaxLength(100)]
+        public string AcknowledgedBy { get; set; }
+    }
+}