settings.php: Sample settings.local.php

 1<?php
 2$databases['default']['default'] = array (
 3  'database' => 'yourDB',
 4  'username' => 'yourDBA',
 5  'password' => 'yourDBPASS',
 6  'prefix' => '',
 7  'host' => 'localhost',
 8  'port' => '3306',
 9  'namespace' => 'Drupal\\Core\\Database\\Driver\\mysql',
10  'driver' => 'mysql',
11);

EDIT: Updated to reflect new learning in https://ismael.casimpan.com/quicktasks-drupal/post/weird-session-issue/