**Previously**
When a course administrator changed the `certificates_display_behavior` (presumably to `end_with_date`) AND set the `certificate_available_date` in Studio, the `certificate_available_date` was not syncing to Credentials.
This was because we chose to send the `certificate_available_date` only if the course is self-paced and the `certificate_display_behavior` is set to `end_with_date`. [See PR #28275](https://github.com/openedx/edx-platform/pull/28275). However, we were checking those two conditions by looking at the relevant `CourseOverview`, which was not yet truly saved to reflect the updated display behavior at the time of the check due to atomic requests. [Read more about atomic requests and transactions here](https://docs.djangoproject.com/en/4.0/topics/db/transactions/#tying-transactions-to-http-requests-1); we have `ATOMIC_REQUESTS` set to `TRUE` in our codebase. Because the `certificate_display_behavior` was not (yet) `end_with_date`, the post to Credentials was not being fired.
**Solution**
To fix, this commit sends the `COURSE_CERT_DATE_CHANGE` signal `on_commit` instead, which waits until the transaction has completed and the update to the `CourseOverview` has been truly applied to the database. [Read more about `on_commit` here](https://docs.djangoproject.com/en/4.0/topics/db/transactions/#django.db.transaction.on_commit). Now, when the relevant `CourseOverview` is read, it will have the updated `certificate_display_behavior`.
See the [Django docs for how to test on_commit callbacks here](https://docs.djangoproject.com/en/3.2/topics/testing/tools/#django.test.TestCase.captureOnCommitCallbacks); this seems to be our first time using the built-in method.
This commit also cleans up some previous code that was meant to get around the problem caused by atomic requests, that is now unneccessary with this fix. It essentially reverses the work done in [PR #26991](https://github.com/openedx/edx-platform/pull/26991): we no longer need to explicitly pass the `certificate_available_date` since we can trust the `CourseOverview` to be properly updated.
**Rejected Solutions**
A. Simply publish the `COURSE_CERT_DATE_CHANGE` signal `on_commit`; no other changes. Rejected because: This would fix the problem, but leaves a lot of unnecessary code and some puzzling inconsistencies. I prefer the solution above because we are cleaning up behind ourselves.
B. Pass the new `certificate_display_behavior` along with the `certificate_available_date`; read those direclty instead of checking the (not-yet-properly-updated) `CourseOverview`. Rejected because: The pattern of passing the new `certificate_available_date` down through all these methods was put in place to get around the atomic requests problem. I believe `on_commit` to be a better solution to getting around that problem. I’d like to move away from passing data down through several functions / methods.
C. Start the celery task `on_commit` (rather than send the signal `on_commit`). Rejected because: The signal receiver basically only starts the celery task, and I find the break to be a bit more readable when sending the signal. No need to split hairs here.
D. Remove the check for pacing and display behavior; send the updated `certificate_available_date` every time there is a change, no matter what the current display behavior is. Rejected because: We intentionally added this check in [PR #28275](https://github.com/openedx/edx-platform/pull/28275) because the task was not behaving as expected without it (specifically around self-paced courses). I assume this is still necessary.
**Relevant Prior Work**
The following PRs--in order--show how this section (and other relevant sections) of the code have been changed over time:
1. [Move cert date signals to avoid race conditions #26841](https://github.com/openedx/edx-platform/pull/26841)
2. [feat: Pass date in cert date update signal #26991](https://github.com/openedx/edx-platform/pull/26991)
3. [Fix certificate available date sync #28275](https://github.com/openedx/edx-platform/pull/28275)
4. [fix: Correct an issue where cert available date was not sent to Crede… #28524](https://github.com/openedx/edx-platform/pull/28524)
MICROBA-1818
Because the available date update to the CourseOverview happens inside a
view's signal and we have atomic requests on, the read that was
happening inside the task happened *before* the write was commited to
the database. To avoid the unknown bugs that would come from disabling
atomic transactions for that view (since it's large), this passes the
date we want down through the signals and tasks so we can skip the DB
read at the end.
Remove deprecated SingleSectionGrader. TNL-5987
Remove display_name and module_id from Scores objects
Update CourseGradeFactory.__init__ to not be user-specific
Update some callers to use CourseGrade class instead of "summary" dict
Remove no longer needed course_grades.py module.
Renamed django signal from GRADES_UPDATED to COURSE_GRADE_CHANGED
