<?php

// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the GNU Affero General Public License v3.0.
// See the LICENCE file in the repository root for full licence text.

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

class AddTrackIdToBeatmapsets extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::table('osu_beatmapsets', function (Blueprint $table) {
            $table->integer('track_id')->unsigned()->nullable();
            $table->index('track_id');
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::table('osu_beatmapsets', function (Blueprint $table) {
            $table->dropColumn('track_id');
            $table->dropIndex('track_id');
        });
    }
}

<?php

// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the GNU Affero General Public License v3.0.
// See the LICENCE file in the repository root for full licence text.

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

class AddTrackIdToBeatmapsets extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::table('osu_beatmapsets', function (Blueprint $table) {
            $table->bigInteger('track_id')->unsigned()->nullable();
            $table->index('track_id');
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::table('osu_beatmapsets', function (Blueprint $table) {
            $table->dropColumn('track_id');
            $table->dropIndex('track_id');
        });
    }
}

--- 
+++ 
@@ -17,7 +17,7 @@
     public function up()
     {
         Schema::table('osu_beatmapsets', function (Blueprint $table) {
-            $table->bigInteger('track_id')->unsigned()->nullable();
+            $table->integer('track_id')->unsigned()->nullable();
             $table->index('track_id');
         });
     }
Change column to `integer` to match `artist_tracks` table spec
