FIX: Slow to cron rate

The jobs are taking more than an hour to run, so running them hourly
isn’t practical.

mysite/code/crons/NightlyUpdatesCron.php

@@ -0,0 +1,37 @@
+<?php
+
+/**
+ * These nightly updates can clean up anything that might have been missed by the other tasks
+ */
+class NightlyUpdatesCron implements CronTask
+{
+
+    /**
+     * Run at 1am every morning
+     *
+     * @return string
+     */
+    public function getSchedule()
+    {
+        return "0 1 * * *";
+    }
+
+    /**
+     * Run the build task CacheHelpfulRobotDataTask
+     * @return void
+     */
+    public function process()
+    {
+        $taskClasses = [
+            [BuildAddonsTask::class, null], // rebuild all addons
+            [CacheHelpfulRobotDataTask::class, null], // fetch helpful robot data
+        ];
+
+        foreach ($taskClasses as $taskInfo) {
+            list($taskClass, $taskQuerystring) = $taskInfo;
+            $job = new RunBuildTaskJob($taskClass, $taskQuerystring);
+            $jobID = Injector::inst()->get(QueuedJobService::class)->queueJob($job);
+            echo 'Added ' . $taskClass . ' to job queue (job ID ' . $jobID . ")\n";
+        }
+    }
+}

mysite/code/crons/HourlyUpdatesCron.php → mysite/code/crons/RegularUpdatesCron.php

@@ -2,17 +2,21 @@
 
 use SilverStripe\Elastica\ReindexTask;
 
+/**
+ * These regular updates run as often as is practical.
+ * They seem to take 2-3 hours at the moment, so we run them 4 times per day.
+ */
 class SilverStripeElasticaReindexCron implements CronTask
 {
 
     /**
-     * Run hourly, on the hour
+     * Run every 6 hours
      *
      * @return string
      */
     public function getSchedule()
     {
-        return "0 * * * *";
+        return "0 */6 * * *";
     }
 
     /**