firefly-iii/app/database/seeds/DefaultUserSeeder.php

<?php

/**
 * Class DefaultUserSeeder
 */
class DefaultUserSeeder extends Seeder
{
    public function run()
    {
        DB::table('users')->delete();

        User::create(
            ['email' => 'thegrumpydictator@gmail.com', 'password' => 'sander', 'reset' => null, 'remember_token' => null, 'migrated' => 0]
        );

    }

}