Editing a question now snapshots its previous state. The last 5 are kept — the
value is undoing a recent mistake, not an audit trail, and an uncapped history of
full question bodies grows without bound (migration a9b0c1d2e3f4).
A restore snapshots the current state first, so the restore is itself undoable.
History is gated by the same per-category grant that gates editing, so it cannot
be read by someone who could not have made the edit. The question editor shows
the versions with their dates and a Restore action.
Also added docs/TODO.md tracking everything requested and not yet delivered:
AI Mode and its citation contract, global search, study-plan editing and
articles-in-blocks, admin settings revamp, image libraries and question folders,
media management, nested article sections with references and per-section notes
and feedback, per-question notes and feedback in the runner, tutorial mode, the
per-question performance table, the Overview dashboard, systems subsystems, and
dropping "Pediatrics" as a discipline.
Tests: 6 new backend (snapshot on edit, cap at five newest-first, restore,
restore is undoable, refused without edit rights, unknown version). Full suites
green: 119 backend, 136 frontend, build clean.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PpfzbZ1QTLMeVYxM2kyq8m
