firefly-iii/app/config/database.php

<?php

return [
    'fetch'       => PDO::FETCH_CLASS,
    'default'     => 'mysql',
    'connections' => [
        'mysql'  => [
            'driver'    => 'mysql',
            'host'      => 'localhost',
            'database'  => 'forge',
            'username'  => 'forge',
            'password'  => '',
            'charset'   => 'utf8',
            'collation' => 'utf8_unicode_ci',
            'prefix'    => '',
        ],
        // previous database, if present:
        'old-firefly'  => [
            'driver'    => 'mysql',
            'host'      => 'localhost',
            'database'  => '(previous database)',
            'username'  => '',
            'password'  => '',
            'charset'   => 'utf8',
            'collation' => 'utf8_unicode_ci',
            'prefix'    => '',
        ],

    ],
    'migrations'  => 'migrations',
    'redis'       => [

        'cluster' => false,

        'default' => [
            'host'     => '127.0.0.1',
            'port'     => 6379,
            'database' => 0,
        ],

    ],

];