Deprecation/Removal: PersistentGradesEnabledFlag (DEPR-152)

Hi there,

We plan to deprecate and remove the PersistentGradesEnabledFlag model, CoursePersistentGradesFlag model, and assume_zero_if_absent waffle flag, enabling database-persisted grades for all courses. We are targeting removal for April 20, 2021, to be included in the Maple release (December, 2021)

Please read [DEPR-152] Remove Persistent Course Grades Flags - JIRA for more information and to post any questions/comments. The proposed deadline for comments before acceptance is April 19, 2021.

Thanks, Nathan Sprenkle