[naincy128]

Root cause

_retire_proctored_exam_software_secure_review_and_history_and_comment cleared raw_data / encrypted_video_url by calling .save() on each review and review-history row. Saving a ProctoredExamSoftwareSecureReview fires:

• pre_save → on_review_changed: archives the un-retired review, PII included, into ProctoredExamSoftwareSecureReviewHistory.
• post_save → finish_review_workflow: calls get_backend_provider() for the exam (this raises when the backend was removed from PROCTORING_BACKENDS), then update_attempt_status() (credit/grades/certificates side effects) and emits review_received.

Retirement only needs to scrub PII. Re-running the review workflow is unnecessary and can fail.

Fix

Clear the fields with QuerySet.update() on the reviews and review history, so no save signals fire. Comment retirement is unchanged (it already used bulk_update).

Behavior changes:

• Retirement no longer fails for reviews on exams with an unconfigured backend.
• Retirement no longer changes attempt status, touches credit/grades, or emits review_received events.
• Retirement no longer writes a new history row containing the pre-retirement PII.