We have been asked to add a functionality that shows an active countdown with a You have %h %min %sec to catch our same day delivery offer message on a product view page, whereas the countdown is based on an optionally assigned daily cutoffAt time, set for every product individually, for every day of a week independently.

Let's take a moment to think about our approach here:

• Every product and every day of a week imply Monday to Sunday _[Cutoff_At] product attributes
• Product attributes imply setup script
• Active countdown implies JS components

We start by bumping up the setup_version value of our <MODULE_DIR>/etc/module.xml file from 1.0.0 to 1.0.1. This allows us to introduce the <MODULE_DIR>/Setup/UpgradeData.php file with an upgrade, as follows:

protected function upgradeToVersionOneZeroOne(
  \Magento\Framework\Setup\ModuleDataSetupInterface...