migration.php

public function up()
{
    Schema::table('jobs', function (Blueprint $table) {
        $table->dropIndex('jobs_queue_reserved_reserved_at_index');
        $table->dropColumn('reserved');
        $table->index(['queue', 'reserved_at']);
    });

    Schema::table('failed_jobs', function (Blueprint $table) {
        $table->longText('exception')->after('payload');
    });
}

public function down()
{
    Schema::table('jobs', function (Blueprint $table) {
        $table->tinyInteger('reserved')->unsigned();
        $table->index(['queue', 'reserved', 'reserved_at']);
        $table->dropIndex('jobs_queue_reserved_at_index');
    });

    Schema::table('failed_jobs', function (Blueprint $table) {
        $table->dropColumn('exception');
    });
}