Method: Set process Option cache
Source Files: includes/admin/class-learndash-admin-settings-data-reports.php
Method: Filter post_parent before update/insert. Ensure the post_parent field is zero for course post types.
Method: Check single table exists
Class: Class LearnDash Data Upgrades for Course Access List.
Method: Protected constructor for class
Method: Class method for the AJAX update logic This function will determine what users need to be converted. Then the course and quiz functions will be called to convert each individual user data set.