Add some PHP-CLI scripts to be run as cronjobs

common/scripts/clean_old_notifications.php

@@ -0,0 +1,37 @@
+<?php
+
+/**
+ * This script deletes old notifications.
+ * 
+ * Notifications must be dismissed as quickly as possible in order to prevent
+ * the ncenterlite_notify table from becoming too large. For best performance,
+ * you should run this script at least once every few days.
+ */
+require_once __DIR__ . '/common.php';
+
+// Delete notifications older than this number of days.
+$days = 30;
+
+// Initialize the exit status.
+$exit_status = 0;
+
+// Execute the query.
+$args = new stdClass;
+$args->old_date = date('YmdHis', time() - ($days * 86400));
+$output = executeQuery('ncenterlite.deleteNotifyAll', $args);
+if ($output->toBool())
+{
+	echo "Successfully deleted all notifications older than $days days.\n";
+}
+else
+{
+	echo "Error while deleting notifications older than $days days.\n";
+	echo $output->getMessage() . "\n";
+	$exit_status = abs($output->getError());
+}
+
+// Set the exit status if there were any errors.
+if ($exit_status != 0)
+{
+	exit($exit_status);
+}