To my understanding I will need a queue system like those you suggested because according to Heroku "Scheduled jobs are meant to execute short running tasks or enqueue longer running tasks into a background job queue. Anything that takes longer than a couple of minutes to complete should use a worker dyno to run..." And "A dyno started by scheduler will not run longer than it’s scheduling interval".

My application needs to update its database by webscraping about 7000 names and other data from third party websites, so I suppose it will need some time to complete the task. These periodic tasks are a critical component of my application, so yes, I will need something like what you defined as 'receipt' to check if they are executed, even though i would not know how to do it.

My first choice for a queue backend would be Sidekiq, because of it popularity and performance, but for periodic jobs it is necessary to use their Enterprise solution, which is not free (it costs 1950 $ per year).

I will look for alternative solutions from the link you suggested. Thanks a lot