function topic_needs_resubscribing($hub_topic)
{
    $pdo = getPdo();
    $query = $pdo->prepare("SELECT `expires_at` < ? as `expired` FROM `subscriptions` WHERE `hub_topic` = ? ORDER BY `expires_at` DESC LIMIT 1");
    $query->execute([
        time(),
        $hub_topic
    ]);

    return (int) $query->fetchColumn(0) === 1;
}