osu/osu.Game/Migrations/20190708070844_AddBPMAndLengthColumns.cs

using Microsoft.EntityFrameworkCore.Migrations;

namespace osu.Game.Migrations
{
    public partial class AddBPMAndLengthColumns : Migration
    {
        protected override void Up(MigrationBuilder migrationBuilder)
        {
            migrationBuilder.AddColumn<double>(
                name: "BPM",
                table: "BeatmapInfo",
                nullable: false,
                defaultValue: 0.0);

            migrationBuilder.AddColumn<double>(
                name: "Length",
                table: "BeatmapInfo",
                nullable: false,
                defaultValue: 0.0);
        }

        protected override void Down(MigrationBuilder migrationBuilder)
        {
            migrationBuilder.DropColumn(
                name: "BPM",
                table: "BeatmapInfo");

            migrationBuilder.DropColumn(
                name: "Length",
                table: "BeatmapInfo");
        }
    }
}