Projektdateien hinzufügen.

Webshop.Domain/Entities/ProductVariant.cs

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+using System;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Webshop.Domain.Entities;
+
+/// <summary>
+/// Für Produkte mit unterschiedlichen Attributen (z.B. Größe, Farbe) und eigenem Lagerbestand.
+/// </summary>
+public class ProductVariant
+{
+    [Key]
+    public Guid Id { get; set; }
+
+    [Required]
+    [ForeignKey(nameof(Product))]
+    public Guid ProductId { get; set; }
+
+    [Required]
+    [MaxLength(100)]
+    public string Name { get; set; } // z.B. "Farbe", "Größe"
+
+    [Required]
+    [MaxLength(100)]
+    public string Value { get; set; } // z.B. "Rot", "XL"
+
+    // Unique-Constraint wird typischerweise via Fluent API konfiguriert
+    [MaxLength(50)]
+    public string? SKU { get; set; }
+
+    // Precision wird via Fluent API konfiguriert
+    [Required]
+    public decimal PriceAdjustment { get; set; }
+
+    [Required]
+    public int StockQuantity { get; set; }
+
+    [MaxLength(2000)]
+    public string? ImageUrl { get; set; }
+
+    [Required]
+    public bool IsActive { get; set; }
+
+    // Navigation Property
+    public virtual Product Product { get; set; }
+}