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From the install:

$employee = new Employee();
$employee->id = 1;
$employee->force_id = true;
$employee->firstname = Tools::ucfirst($data['admin_firstname']);
$employee->lastname = Tools::ucfirst($data['admin_lastname']);
$employee->email = $data['admin_email'];
$employee->setWsPasswd($data['admin_password']);
$employee->last_passwd_gen = date('Y-m-d h:i:s', strtotime('-360 minutes'));
$employee->bo_theme = 'default';
$employee->default_tab = 1;
$employee->active = true;
$employee->id_profile = 1;
$employee->id_lang = (int) Configuration::get('PS_LANG_DEFAULT');
$employee->bo_menu = true;
if (!$employee->add()) {
	$this->setError($this->translator->trans('Cannot create admin account', [], 'Install'));

	return false;
}