On papers where band detection yields few/no questions but opencv/gemma still emit response
regions, those regions referenced a synthetic default_qid that was never inserted -> FK violation
(exam_response_areas/exam_boundaries -> exam_questions). Ensure the fallback container question
exists and reattach orphan child rows to it.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
44ccba2151