How to reliably schedule regularly reoccurring jobs with arangodb? - arangodb

Question

I am evaluating arangodb "Community Edition" v.3.7.6 in Cluster Mode. At the moment, I am trying to figure out, how to reliably schedule regularly reoccurring jobs via queues in my foxx service.
I have read the documentation pages here and here and came up with the following scripts:
setup.js
const queues = require('#arangodb/foxx/queues')
var myQueue = undefined
try {
myQueue = queues.get('myqueue')
} catch (e) {
myQueue = queues.create('myqueue')
}
myQueue.push({
name: "myRegularTask",
mount: module.context.mount
},
{to: 'hello#example.com', body: 'Hello world'},
{
repeatTimes: Infinity,
repeatUntil: Date.now() + (24 * 60 * 60 * 1000),
repeatDelay: 5 * 1000
});
myRegularTask.js
'use strict';
const db = require('#arangodb').db;
const testCollection = db._collection('test')
testCollection.save({text: 'sample text'});
manifest.json
{
"$schema": "http://json.schemastore.org/foxx-manifest",
"main": "index.js",
"engines": {
"arangodb": "^3.0.0"
},
"name": "myapp",
"version": "0.1.0",
"tests": "test/**/*.js",
"scripts": {
"setup": "scripts/setup.js",
"myRegularTask": "scripts/myRegularTask.js"
}
}
So what I think it is supposed to do is that it registers a regular job that is executed every 5 seconds (and inserts a document into my testCollection) once I have installed my foxx service.
It actually does that sometimes. However, most of the time nothing happens, no matter how long I wait.
And that is the question of this post:
How come that the behavior of above code is undeterministic to me? What am I doing wrong to get it working always?
Thanks
Seb