osu/osu.Game/Migrations/20190225062029_AddUserIDColumn.cs

using Microsoft.EntityFrameworkCore.Migrations;

namespace osu.Game.Migrations
{
    public partial class AddUserIDColumn : Migration
    {
        protected override void Up(MigrationBuilder migrationBuilder)
        {
            migrationBuilder.AddColumn<long>(
                name: "UserID",
                table: "ScoreInfo",
                nullable: true);
        }

        protected override void Down(MigrationBuilder migrationBuilder)
        {
            migrationBuilder.DropColumn(
                name: "UserID",
                table: "ScoreInfo");
        }
    }
}