logSystem-advance/environments/dev/api/config/main-local.php

<?php

$config = [
	'components' => [
		'db' =>   require __DIR__ . '/../../common/config/db-local.php',
		'request' => [
			// !!! insert a secret key in the following (if it is empty) - this is required by cookie validation
			'cookieValidationKey' => '',
		],
	]
];

return $config;