Add web cron ability #821 (#1073)

* Use database for kvp storage

* Read kvpstore

* Add web cron ability through API #821

* Style fixes

* Fix text

app/Exceptions/CronInvalid.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace App\Exceptions;
+
+class CronInvalid extends AbstractHttpException
+{
+    public const MESSAGE = 'Cron ID is disabled or invalid';
+
+    public function __construct()
+    {
+        parent::__construct(400, static::MESSAGE);
+    }
+
+    /**
+     * Return the RFC 7807 error type (without the URL root)
+     */
+    public function getErrorType(): string
+    {
+        return 'cron-invalid';
+    }
+
+    /**
+     * Get the detailed error string
+     */
+    public function getErrorDetails(): string
+    {
+        return $this->getMessage();
+    }
+
+    /**
+     * Return an array with the error details, merged with the RFC7807 response
+     */
+    public function getErrorMetadata(): array
+    {
+        return [];
+    }
+}