public class DataContext : IdentityDbContext<User>
{
    public DataContext(DbContextOptions<DataContext> options) : base(options)
    {

    }

    public DbSet<Product>  Products { get; set; }
    public DbSet<Category> Categories { get; set; }
    public DbSet<Models.Type> Types { get; set; }

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        base.OnModelCreating(modelBuilder);

        modelBuilder.Entity<Product>()
            .HasOne(p => p.Seller)
            .WithMany(u => u.Products)
            .HasForeignKey(p => p.SellerId);
    }
}

public class DataContext : IdentityDbContext<User>
{
    public DataContext(DbContextOptions<DataContext> options) : base(options)
    {

    }

    public DbSet<Product>  Products { get; set; }
    public DbSet<Category> Categories { get; set; }
    public DbSet<Models.Type> Types { get; set; }

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        base.OnModelCreating(modelBuilder);

        modelBuilder.Entity<Product>()
            .HasOne(p => p.Seller)
            .WithMany(u => u.Products)
            .HasForeignKey(p => p.SellerId);
    }
}

public class User : IdentityUser
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string FirstName {  get; set; }
    public string LastName { get; set; }
    public string? Facebook {  get; set; }
    public string? Instagram { get; set; }
    public string? WhatsApp { get; set; }
    public string Location { get; set; }
    public ICollection<Product> Products { get; set; }
}

public class User : IdentityUser
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string FirstName {  get; set; }
    public string LastName { get; set; }
    public string? Facebook {  get; set; }
    public string? Instagram { get; set; }
    public string? WhatsApp { get; set; }
    public string Location { get; set; }
    public ICollection<Product> Products { get; set; }
}