初始化

backend/HardwarePerformance.Core/Entities/BaseEntity.cs

@@ -0,0 +1,18 @@
+namespace HardwarePerformance.Core.Entities
+{
+    /// <summary>
+    /// 实体基类
+    /// </summary>
+    public abstract class BaseEntity
+    {
+        /// <summary>
+        /// 创建时间
+        /// </summary>
+        public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+        
+        /// <summary>
+        /// 更新时间
+        /// </summary>
+        public DateTime UpdatedAt { get; set; } = DateTime.UtcNow;
+    }
+}

backend/HardwarePerformance.Core/Entities/Category.cs

@@ -6,7 +6,7 @@ namespace HardwarePerformance.Core.Entities
     /// <summary>
     /// 产品类别实体
     /// </summary>
-    public class Category : Infrastructure.Data.BaseEntity
+    public class Category : BaseEntity
     {
         public int Id { get; set; }
         

backend/HardwarePerformance.Core/Entities/DataSource.cs

@@ -6,7 +6,7 @@ namespace HardwarePerformance.Core.Entities
     /// <summary>
     /// 数据源实体
     /// </summary>
-    public class DataSource : Infrastructure.Data.BaseEntity
+    public class DataSource : BaseEntity
     {
         public int Id { get; set; }
         

backend/HardwarePerformance.Core/Entities/PerformanceScore.cs

@@ -6,7 +6,7 @@ namespace HardwarePerformance.Core.Entities
     /// <summary>
     /// 性能分数实体
     /// </summary>
-    public class PerformanceScore : Infrastructure.Data.BaseEntity
+    public class PerformanceScore : BaseEntity
     {
         public int Id { get; set; }
         

backend/HardwarePerformance.Core/Entities/Product.cs

@@ -6,7 +6,7 @@ namespace HardwarePerformance.Core.Entities
     /// <summary>
     /// 产品实体
     /// </summary>
-    public class Product : Infrastructure.Data.BaseEntity
+    public class Product : BaseEntity
     {
         public int Id { get; set; }
         

backend/HardwarePerformance.Core/Entities/RankingHistory.cs

@@ -6,7 +6,7 @@ namespace HardwarePerformance.Core.Entities
     /// <summary>
     /// 排名历史实体
     /// </summary>
-    public class RankingHistory : Infrastructure.Data.BaseEntity
+    public class RankingHistory : BaseEntity
     {
         public int Id { get; set; }
         

backend/HardwarePerformance.Core/Entities/Specification.cs

@@ -6,7 +6,7 @@ namespace HardwarePerformance.Core.Entities
     /// <summary>
     /// 产品规格参数实体
     /// </summary>
-    public class Specification : Infrastructure.Data.BaseEntity
+    public class Specification : BaseEntity
     {
         public int Id { get; set; }