AttributePersistor
Magento\Catalog\Model\ResourceModel\AttributePersistor
What it does
This class handles the persistence (saving and updating) of catalog-specific EAV attributes in the database, extending Magento's base attribute persistence functionality.
Developers would use this when programmatically saving product or category attributes, as it properly handles catalog-specific scope logic including website-level attribute scoping.
It ensures attribute values are saved correctly based on their scope (global, website, or store view).