rowversion3

Webshop.Application/Services/Admin/AdminProductService.cs

@@ -100,7 +100,8 @@ namespace Webshop.Application.Services.Admin
                 IsFeatured = productDto.IsFeatured,
                 FeaturedDisplayOrder = productDto.FeaturedDisplayOrder,
                 Images = images,
-                Productcategories = productDto.CategorieIds.Select(cId => new Productcategorie { categorieId = cId }).ToList()
+                Productcategories = productDto.CategorieIds.Select(cId => new Productcategorie { categorieId = cId }).ToList(),
+                 RowVersion = Guid.NewGuid().ToByteArray()
             };
 
             await _productRepository.AddProductAsync(newProduct);
@@ -183,6 +184,7 @@ namespace Webshop.Application.Services.Admin
             existingProduct.LastModifiedDate = DateTimeOffset.UtcNow;
             existingProduct.IsFeatured = productDto.IsFeatured;
             existingProduct.FeaturedDisplayOrder = productDto.FeaturedDisplayOrder;
+            existingProduct.RowVersion = Guid.NewGuid().ToByteArray();
 
             // --- KATEGORIEN-UPDATE ---
             Console.WriteLine("---- AKTUALISIERE KATEGORIEN ----");

Webshop.Domain/Entities/Product.cs

@@ -53,7 +53,7 @@ namespace Webshop.Domain.Entities
         public virtual ICollection<ProductDiscount> ProductDiscounts { get; set; } = new List<ProductDiscount>();
         public virtual ICollection<Productcategorie> Productcategories { get; set; } = new List<Productcategorie>();
         public virtual ICollection<ProductImage> Images { get; set; } = new List<ProductImage>();
-        [Timestamp] // Diese Annotation ist entscheidend!
+        [ConcurrencyCheck]
         public byte[] RowVersion { get; set; }
     }
 }

Webshop.Infrastructure/Migrations/20251120141425_rowversion2.cs

@@ -0,0 +1,22 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace Webshop.Infrastructure.Migrations
+{
+    /// <inheritdoc />
+    public partial class rowversion2 : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+
+        }
+    }
+}

Webshop.Infrastructure/Migrations/20251120141924_rowversion3.cs

@@ -0,0 +1,22 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace Webshop.Infrastructure.Migrations
+{
+    /// <inheritdoc />
+    public partial class rowversion3 : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+
+        }
+    }
+}

Webshop.Infrastructure/Migrations/ApplicationDbContextModelSnapshot.cs

@@ -616,7 +616,6 @@ namespace Webshop.Infrastructure.Migrations
                     b.Property<byte[]>("RowVersion")
                         .IsConcurrencyToken()
                         .IsRequired()
-                        .ValueGeneratedOnAddOrUpdate()
                         .HasColumnType("bytea");
 
                     b.Property<string>("SKU")