first commit

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

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+using FreeSql.DataAnnotations;
+using F9WebAiTest.Domain.Common;
+
+namespace F9WebAiTest.Domain.Entities.Notice;
+
+/// <summary>待办事项（消息可携带待办）</summary>
+[Table(Name = "TodoItems")]
+[Index("IX_TodoItems_AssigneeId_TodoStatus", "AssigneeId, TodoStatus")]
+public class TodoItem : BaseEntity
+{
+    public long MessageId { get; set; }               // 关联消息ID
+    public long AssigneeId { get; set; }              // 处理人用户ID
+    public TodoItemStatus TodoStatus { get; set; } = TodoItemStatus.Pending; // 待办状态
+    public DateTime? DueTime { get; set; }            // 截止时间
+    public DateTime? CompletedTime { get; set; }      // 完成时间
+    public string HandleResult { get; set; } = "";    // 处理结果
+}