Adding index and max length to user tabel + minor fixes

MainProject/Models/Database/SqlServer/User.cs

@@ -1,12 +1,18 @@
+using System.ComponentModel.DataAnnotations;
 using System.Text.Json.Serialization;
+using Microsoft.EntityFrameworkCore;
 
 namespace BasicDotnetTemplate.MainProject.Models.Database.SqlServer;
 
 public class User : Base
 {
+    [MaxLength(200)]
     public required string Username { get; set; }
+    [MaxLength(200)]
     public required string FirstName { get; set; }
+    [MaxLength(200)]
     public required string LastName { get; set; }
+    [MaxLength(200)]
     public required string Email { get; set; }
     public required string PasswordSalt { get; set; }
     public required string PasswordHash { get; set; }