modules/database/services/exam_projection.py projects a saved template into
cc.public.exams: ExamPaper -> Question/Part -> Region + Part-[:ASSESSES]->
SpecPoint, joined by shared UUIDs (exam_questions.id, exam_response_areas.id,
exam_code, spec_code). Full re-sync per exam_code (idempotent). Reads via
service role + writes via system Neo4j driver (R3.5.1 documented graph-writer).
Wiring (R3.5.4/R5.3):
- PUT /templates/{id} enqueues project_template_safe via BackgroundTasks
(swallows failures so a graph hiccup never fails the canvas save).
- POST /templates/{id}/neo4j-sync — manual trigger, as-user auth + owner check,
runs synchronously and returns projection counts.
Unit tests: projection scheduled on PUT; neo4j-sync owner/403/404.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
S4-5: new routers/exam/ package mounted at /api/exam (R5.1/E5, not under
/database/). Template CRUD with hybrid persistence (R5.2):
- POST/GET/GET{id}/PUT{id}/DELETE{id} /templates + PATCH /questions/{qid}
- Calls Supabase AS THE USER via SupabaseAnonClient.for_user (E1 fix), so the
RLS in 72-exam-marker.sql is enforced; no service-role for user-facing ops.
- Institute resolved/validated via the user_institute_ids() SECURITY DEFINER
RPC (institute_memberships is deny-all as-user per E4); client-supplied
institute_id is validated, never trusted (R5.5).
- Ownership pre-checked before writes (E2); out-of-scope ids read back as 404
under RLS (IDOR-safe). Soft-delete archives, never hard-deletes.
- PUT full-replace preserves client UUIDs as Neo4j join keys (spec §2).
- eb_exams.exam_code denormalised via a documented service-role catalogue
lookup (eb_exams is shared reference data, deny-all as-user per E4).
Unit tests cover auth, CRUD, ownership/IDOR, institute validation, soft-delete.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
