public function render_guests_page() {
    if (!class_exists('HFIS_Guests_Module')) {
        require_once HFIS_PLUGIN_DIR . 'modules/guests/class-guests.php';
    }
    $guests = new HFIS_Guests_Module();
    $guests->render_page();
}// Guests table
$table_name = $wpdb->prefix . HFIS_TABLE_GUESTS;
$sql = "CREATE TABLE IF NOT EXISTS $table_name (
    id int(11) NOT NULL AUTO_INCREMENT,
    guest_name varchar(255) NOT NULL,
    company_name varchar(255),
    gst_number varchar(50),
    mobile_number varchar(20) NOT NULL,
    email varchar(100),
    address text,
    check_in_date datetime NOT NULL,
    check_out_date datetime NOT NULL,
    number_of_nights int(11) NOT NULL,
    number_of_guests int(11) NOT NULL,
    room_id int(11),
    status varchar(20) DEFAULT 'active',
    check_out_notes text,
    created_at datetime DEFAULT CURRENT_TIMESTAMP,
    updated_at datetime DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    PRIMARY KEY (id),
    KEY room_id (room_id)
) $charset_collate;";

dbDelta($sql);