query("SELECT COUNT(*) FROM messages WHERE sender = 'user' AND is_read = 0")->fetchColumn();
$pending_orders = $pdo->query("SELECT COUNT(*) FROM fiat_orders WHERE status IN ('matching', 'submitting')")->fetchColumn();
$orders = $pdo->query("SELECT o.*, u.username FROM option_orders o JOIN users u ON o.user_id = u.id ORDER BY o.created_at DESC")->fetchAll();
?>
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