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backend/F9WebAiTest.Domain/Entities/Entity.cs

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+using FreeSql.DataAnnotations;
+using F9WebAiTest.Domain.Common;
+
+namespace F9WebAiTest.Domain.Entities;
+
+/// <summary>
+/// DDD 实体基类：具有唯一标识与生命周期。
+/// 实现 IEntity 以兼容通用仓储（IRepository&lt;T&gt;）。
+/// 主键由应用层通过雪花 ID 生成器赋值（非数据库自增）。
+/// 参考 BBIT.F9.Domain.Entities.Entity
+/// </summary>
+public abstract class Entity : IEntity
+{
+    [Column(IsPrimary = true)]
+    public long Id { get; set; }
+
+    [Column(Name = "created_at")]
+    public DateTime CreatedAt { get; set; }
+
+    [Column(Name = "updated_at")]
+    public DateTime? UpdatedAt { get; set; }
+
+    [Column(Name = "is_deleted")]
+    public bool IsDeleted { get; set; }
+}