Correcting all errors of types, writed, and entities.

PyroFetes/Models/ShowMaterial.cs

@@ -0,0 +1,15 @@
+using System.ComponentModel.DataAnnotations;
+using Microsoft.EntityFrameworkCore;
+
+namespace PyroFetes.Models;
+
+[PrimaryKey(nameof(ShowId), nameof(MaterialId))]
+public class ShowMaterial
+{
+    [Required] public Show? Show { get; set; }
+    [Required] public int ShowId { get; set; }
+
+    public Material? Material { get; set; }
+    [Required] public int MaterialId { get; set; }
+
+}