Correcting all errors of types, writed, and entities.

PyroFetes/Models/ContactServiceProvider.cs

@@ -0,0 +1,14 @@
+using System.ComponentModel.DataAnnotations;
+using Microsoft.EntityFrameworkCore;
+
+namespace PyroFetes.Models;
+
+[PrimaryKey(nameof(ContactId), nameof(ServiceProviderId))]
+public class ContactServiceProvider
+{
+    [Required] public int ContactId { get; set; }
+    [Required] public int ServiceProviderId { get; set; }
+    
+    public Product? Contact { get; set; }
+    public DeliveryNote? ServiceProvider { get; set; }
+}