first commit

backend/F9WebAiTest.Domain/Entities/Notice/NotificationReceiver.cs

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+using FreeSql.DataAnnotations;
+using F9WebAiTest.Domain.Common;
+
+namespace F9WebAiTest.Domain.Entities.Notice;
+
+/// <summary>消息接收人（投递时生成，记录阅读状态与推送结果：在线推送成功 / 离线待拉取）</summary>
+[Table(Name = "NotificationReceivers")]
+[Index("IX_NotificationReceivers_MessageId_UserId", "MessageId, UserId", IsUnique = true)]
+[Index("IX_NotificationReceivers_UserId_ReadStatus", "UserId, ReadStatus")]
+public class NotificationReceiver : BaseEntity
+{
+    public long MessageId { get; set; }               // 消息ID
+    public long UserId { get; set; }                  // 接收人用户ID
+    public NotificationReadStatus ReadStatus { get; set; } = NotificationReadStatus.Unread; // 阅读状态
+    public DateTime? ReadTime { get; set; }           // 阅读时间
+    public bool IsOffline { get; set; }               // 推送时是否离线
+    public NotificationSendStatus SendStatus { get; set; } = NotificationSendStatus.NotSent; // 推送状态
+    public DateTime? SendTime { get; set; }           // 推送时间
+    public string ErrorMsg { get; set; } = "";        // 错误信息
+}