Sequence/DbContext.cs

using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore;
using Sequence.Entities;

public class DbContext : IdentityDbContext<User, IdentityRole<Guid>, Guid>
{
    public DbContext(DbContextOptions<DbContext> options) : base(options) { }

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

        var deck = CardUtility.GenerateDeck();

        var players = new Player[]
        {
            new Player 
            {
                Id = Guid.NewGuid(),
                
            }
        };

        modelBuilder.Entity<Card>().HasData(deck);

        //modelBuilder.Entity<Player>().HasData()
    }

    public DbSet<Card> Cards { get; set; }
    public DbSet<PlayerCard> PlayerCards { get; set; }
    public DbSet<Match> Matches { get; set; }
    public DbSet<Player> Players { get; set; }

}