feat: created register method for entry

JOBot.Backend/DAL/Context/AppDbContext.cs

@@ -8,4 +8,12 @@ class AppDbContext : DbContext
     public DbSet<User> Users { get; set; }
 
     public AppDbContext(DbContextOptions<AppDbContext> options) : base(options) { }
+
+    protected override void OnModelCreating(ModelBuilder modelBuilder)
+    {   
+        base.OnModelCreating(modelBuilder);
+
+        modelBuilder.Entity<User>()
+            .HasAlternateKey(b => b.TelegramId);
+    }
 }

JOBot.Backend/DAL/Models/User.cs

@@ -1,9 +1,15 @@
+using System.ComponentModel.DataAnnotations;
+using Microsoft.EntityFrameworkCore;
+
 namespace JOBot.Backend.DAL.Models;
 
+[PrimaryKey(nameof(Id))]
 public class User
 {
     public Guid Id { get; set; }
-    public long TelegramId { get; set; }
+
+    [Key]
+    public required long TelegramId { get; set; }
     public string? Username { get; set; }
     public DateTime CreatedAt { get; set; } = DateTime.Now;
 }