Adds an optional roster.json (set of allowed student IDs) loaded at
startup. add_participant() raises StudentIdNotInRoster when the gate is
on and the supplied id is not present; route returns 403 with a clear
message and logs a roster_reject audit event. Names are NOT checked
against the roster: the join form asks for a current name as a soft
deterrent, but the only hard check is the id.
Includes a deploy/build_roster.py helper that turns class_register
attendance.xlsx into roster.json. Bootstrap env file now exports
QUIZ_ROSTER_PATH; missing file disables the gate (legacy behaviour).
Also drops the user-facing "The cookie is per-device." line from the
join card — students don't need to know the implementation; replaced
with "Enter your registered student ID and your current full name."
Three small UX/fairness tweaks from manual live testing:
1. Post-submit "wait for reveal" screen: show only the response time, no
score. The +score reveal leaked correctness — any positive number =
correct, zero = wrong — short-circuiting the "stop and think" beat
the reveal pause was supposed to enforce. Time stays as the
engagement signal; score now waits for the instructor reveal.
2. Final-screen "Correct X / Y" denominator is now total_questions
instead of questions_answered. Missed questions are scored zero, so
they belong in the denominator visibly. Server adds total_questions
to the session_ended payload.
3. Projector score-distribution: drop the in-chart count labels (they
collided with each other and with the median tag at small N), restore
the previously-computed-but-not-rendered x-axis tick labels at the
bottom. Stats line at the foot keeps n / mean / max.
Also: short-circuit the per-submit instructor + presence broadcasts
when no instructor / projector is connected (no listener, no DB work).
The 50-student load test was tight on margin against its 2 s
time_limit; with the new presence_message / live_histogram_message DB
queries firing on every submit, the margin disappeared on busy boxes.
Conftest fixture also bumped to 8 s per question for the same reason —
gives breathing room for sequential WS submits in the load test.
71/71 pytest green.
Backend simplification:
- The server now loads ONE pool JSON from $QUIZ_POOL_PATH at startup and
upserts a single canonical session. The session id comes from the pool
JSON's optional "session_id" field, falling back to $QUIZ_SESSION_ID.
- The multi-quiz / multi-session CRUD API is gone:
DELETED GET/POST /admin/api/quizzes
DELETED POST /admin/api/quizzes/upload
DELETED GET/POST /admin/api/sessions
DELETED GET /admin/login (HTML stub)
DELETED GET /admin/api/sessions/{sid}/csv (replaced by /admin/api/csv)
Replaced with a single-session control surface:
GET /admin/ — serves admin.html unconditionally
GET /admin/api/state — admin-gated; pool meta + state + QR + join URL
POST /admin/api/reset — admin-gated; wipe submissions + back to lobby
POST /admin/logout — clear admin cookie
GET /admin/api/csv — single-session results
WS /ws/instructor/{sid} — kept; new commands "next" + "reset"
- Instructor "Next" button is now a single state-driving command
(RoomManager.advance_to_next): from lobby it opens Q0; from question_open
it closes the current Q and opens the next; from question_closed it
opens the next; if past the last question it ends the session.
- New RoomManager.reset wipes submissions, participants, and per-question
state, then broadcasts a clean lobby.
- Student GET / now redirects to /?sid=<canonical> when no sid is given,
so the QR / share URL is fully deterministic.
Frontend rewrite (functional baseline; visual polish to follow):
- /admin/ is now a single SPA: GET /admin/api/state decides login form
vs dashboard. No separate /admin/login URL bar.
- Admin dashboard is state-driven with one primary action per state.
QR code, join URL, and live participant list are always visible on the
left so the operator can leave the page on a projector.
- Student answer buttons are big and tappable; reveal screen highlights
correct/wrong choice + shows score, total, and rank.
- Static admin/student SPAs share a CSS palette with light/dark support.
Tests rewritten around the single canonical session id.
The auto-bootstrapped session lets each test fixture skip the old
quiz/session creation dance. 39/39 tests pass.
Cleanup:
- Deleted CODEX_PROMPT.md, IMPLEMENTATION_REPORT.md, NOTES.md, SPEC.md,
static/observer.html (obsolete codex-build artifacts and the unused
observer view).
- .gitignore now blocks /pool.json (the runtime file the operator drops
on the server) and the leftover .codex_done / codex_run.log / etc.
- bootstrap.sh seeds /opt/quiz/pool.json from examples/pool_example.json
on first deploy so a fresh box reaches a usable state without manual
intervention; .env now includes QUIZ_POOL_PATH.
