Added ef core integration

debug/TestApplication/Models/Post.cs

@@ -0,0 +1,13 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace TestApplication.Models;
+
+public class Post {
+    [Key]
+    public Guid Id { get; } = Guid.CreateVersion7();
+    
+    public required User Sender { get; set; }
+    
+    [MaxLength(5000)]
+    public required string Message { get; set; }
+}

debug/TestApplication/Models/User.cs

@@ -0,0 +1,30 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace TestApplication.Models;
+
+public class User {
+    [Key]
+    public Guid Id { get; } = Guid.CreateVersion7();
+    
+    [EmailAddress, MaxLength(25)]
+    public required string Email { get; set; }
+    
+    [MaxLength(25)]
+    public required string Username { get; set; }
+    
+    [MaxLength(64)]
+    public required string Password { get; set; }
+    
+    [MaxLength(25)]
+    public required string FirstName { get; set; }
+    
+    [MaxLength(25)]
+    public required string LastName { get; set; }
+
+    [MaxLength(255)]
+    public string? Description { get; set; }
+
+    public required DateOnly Birth { get; set; } = DateOnly.FromDateTime(DateTime.Today);
+
+    public List<Post> Posts { get; set; } = new();
+}