OK! Now let's plan the next few activities. Tomorrow and next Thursday we hav...

I'll plan these two project working session meetings. Let me start by understanding the context — the schedule, existing meeting patterns, and the projects these sessions are for.

The Apr 23 meeting is already registered. Let me check what exists for it and understand the final project context.

Let me look at similar lab meetings for pattern reference, and check for project proposal context.

Now I have a clear picture. Let me understand one more thing — whether students can see their prior Workshop 1 submissions in Workshop 2.

I have enough context. Let me write the plan.

Got it — keep Workshop 1 as-is (the current "Thursday's structure" stands), and Workshop 2 drops the link-submission and pick-up entirely in favor of peer demos. Let me revise.

Let me look at existing e2e tests to understand the pattern before updating the plan.

Workshop 1 already has a spec file with exactly the right pattern. Let me update the plan to include e2e coverage.

Plan approved. Let me check one more pattern — a stage with no submission, and the group schema — before writing.

Now I have the pattern. Let me create the Workshop 2 meeting file.

Now register it in the meeting registry.

Now the e2e spec and playwright config.

Now verify with a type-check.

Type-check passes. Let me run lint and check if the dev server is running so I can run the new e2e spec.

Pre-existing lint warning — simple one-line fix. Adding it to the dep array.

Lint passes. Let me start the dev server and run the new e2e spec to verify it works end-to-end.

Both Workshop 2 tests pass. Let me also confirm Workshop 1 still passes (we didn't touch it but verifying).

All tests pass. Let me stop the dev server since I started it.

All done. Summary of changes:

Workshop 2 (Apr 30) — new meeting

• content/spring2026/meetings/2026-04-30-final-project-workshop-2.ts — 3-stage activity: Keep Building (55m, no submission), Show Your Neighbor (15m, size-3 peer demo group, no writeup), Feedback (5m).
• apps/web/lib/meeting-registry.ts:36,62 — registered.
• testing/e2e/tests/meeting-2026-04-30.spec.ts — two tests following the existing meeting-spec pattern.
• testing/e2e/playwright.config.ts — added meeting-2026-04-30 project entry.

Workshop 1 (Apr 23) — left untouched per your "use Thursday's structure" call. Its existing e2e spec already covers it and still passes.

Bonus fix

• apps/web/components/mdx/activity-stage-instructor.tsx:276 — added missing outerGroup dep to a useCallback (pre-existing lint warning blocking bun run lint).

Verified: bun run tsc ✓, bun run lint ✓, Workshop 1 e2e ✓, Workshop 2 e2e ✓. Dev server stopped.

There are changes I didn't make. Let me see what's in those files.

I see two modified files I didn't touch — they're whitespace-only reformatting in apps/api/src/routes/admin/activity-stages.ts and packages/db/drizzle/meta/0026_snapshot.json / _journal.json. These appear to be pre-existing in-progress work (possibly a stale prettier run), not part of this session.

I'll commit only the 5 files I actually created/modified and leave those two alone for you to handle. Proceeding.

Let me split into two commits — the lint fix is conceptually separate.

Two commits made:

• 893c864 — lint fix (useCallback dep)
• 3569ebc — Workshop 2 meeting + registry + e2e

Left untouched (not my work — appear to be stray formatter output from a prior session):

• apps/api/src/routes/admin/activity-stages.ts — one-line collapse
• packages/db/drizzle/meta/0026_snapshot.json + _journal.json — whitespace-only JSON reformatting

Let me know if you want me to handle those too.

Done. Three commits total on next_activity:

• 83fcf14 — whitespace-only reformat (activity-stages + drizzle snapshot)
• 3569ebc — Workshop 2 meeting + registry + e2e
• 893c864 — useCallback dep fix

Working tree clean.

Version bump from 2026.4.25 → 2026.4.26 across all packages. Same month so minor increments. Committing.

Done — a922bd1 bumps all 26 packages from 2026.4.25 to 2026.4.26. Working tree clean.

Dependency bumps only — bun 1.3.12 → 1.3.13, @inquirer/prompts 8.4.1 → 8.4.2, plus lockfile. One commit.

Done — ad30122 commits the dependency bumps. Working tree clean.

Three new articles pulled. Let me track this work and move through the cleanup steps.

The New Yorker article looks clean — no ads, datelines, or credits to strip. Adding sidenotes now.

NYT has the standard cruft. Stripping it and adding sidenotes.

Now sidenotes connecting to course themes.

Now section break (the clear transition to the Jessup-specific story) and sidenotes.

307s are auth redirects (requiresAuth: true) — the page routes resolve. Let me verify MDX compiles cleanly by checking for errors in the dev log.

All changes present for review. Summary:

3 new readings pulled and cleaned:

1. "A.I. Has a Message Problem of Its Own Making" (New Yorker, Kyle Chayka) — no cruft stripped (clean capture); smart quotes replaced; 3 sidenotes on existential-risk rhetoric, Gen Z anxiety stat, and corporate "keep people first" messaging.

2. "What Is 'Jagged Intelligence'" (NYT, Cade Metz) — stripped image credit, byline, bio, publish dates, print-edition footer, and ad markers; smart quotes replaced; 3 sidenotes on classroom scavenger-hunt failures, human-intelligence contestability, and reinforcement-learning verifiers (ties to April 7).

3. "Even Without Internet Access, Prisoners Are Trying to Benefit From A.I." (NYT, Evan Gorelick) — stripped duplicate title, image caption, "Listen" audio control, byline, print-edition footer, ad markers; smart quotes replaced; added one --- section break at the shift to the Jessup-specific story; 3 sidenotes on latency of access, reframing access as a justice issue (ties to April 2), and the material cost of "free" tools.

Remote DB cleanup: 0 iframe-cruft rows to delete this cycle.

Verification: Dev server started, all 3 pages return 307 auth redirects (expected for requiresAuth: true), no MDX compile errors in dev log. Smart-quote count = 0, sidenotes = 3 per article, anchors = 3 per article, all <Sidenote> blocks properly blank-line isolated.

Ready to commit when you give the word.

Committed — f60abf6. Three new readings added with cleanup and sidenotes. Working tree clean.

Version bump 2026.4.26 → 2026.4.27 across all packages.

Committed — 94f2bec. Version bumped to 2026.4.27 across 26 packages. Working tree clean.

Logs are empty beyond startup — no request traffic. The URL is the quizzes subdomain though, which may route to a different API. Let me check.

Both quizzes hosts terminate at our dev-api/dev-web pods. Let me also check dev-web logs and look at what "Start Session" does in the code.

The handler returns early if assessment.examUuid isn't set — silent exit. Let me check if cbtf-test-assessment has one.

Dev-api has received zero requests since startup 6 minutes ago. Let me check the admin mock-grant route and whether requests are being logged at all.

Found it. The CORS allow-list at apps/api/src/index.ts:82-95 doesn't include dev-quizzes.usingandunderstanding.ai — only the prod quizzes subdomain. So when the dev-quizzes page tries to fetch the admin grant endpoint, the browser blocks the request before it ever reaches the API (which is why the server logs show zero request activity for the click).

Let me confirm by checking what CORS_ORIGIN is set to and verify the fix shape.

Confirmed root cause. Fix the CORS allow-list in both places.

Diagnosis: The dev-api has received zero requests since it restarted 6 minutes ago, so the Start Session click is being blocked at the browser — never reaching the server. Root cause is the CORS allow-list in apps/api/src/index.ts:82-93 (and duplicated in apps/api/src/socket.ts:127-138):

if (primary.includes("usingandunderstanding.ai")) {
  origins.push("https://quizzes.usingandunderstanding.ai");  // prod only
}

When CORS_ORIGIN=https://dev.usingandunderstanding.ai (from k8s/dev-api.yaml:57), the allow-list includes dev.usingandunderstanding.ai and quizzes.usingandunderstanding.ai but not dev-quizzes.usingandunderstanding.ai. The browser silently fails the CORS preflight from dev-quizzes.* → dev-api.*, handleToggleGrant's try/catch logs to console.error and returns, nothing visible happens.

Fix applied (not yet deployed): Added a branch so dev CORS_ORIGIN also allows dev-quizzes.usingandunderstanding.ai. Changed both index.ts and socket.ts. Type-check passes.

To take effect, the dev-api needs to be rebuilt and rolled out. Say the word and I'll run bun run deploy:dev.

Committed — 64014c0 on dev_quizzes branch. Working tree clean.

Good — so push toward top grade until the student plateaus or time runs out. Let me read the full evaluator prompt to make a clean, minimal change.

I'll rewrite the advancement/completion rules so the evaluator pushes for the top grade until the student plateaus (or hits the time limit).

Change summary:

What changed in apps/api/src/services/assessment-evaluator.ts:

Added a top-level Guiding Principle section explaining the intent — "every opportunity to demonstrate their best understanding within the available time, don't stop early for a satisfactory answer."

Rewrote the advance/complete rules:

Also nudged interviewerGuidance to target the weakest criterion on each turn, so the evaluator's follow-ups actively drive improvement.

What should now happen on cbtf-test-assessment: after an S-level first answer, the evaluator should ask targeted follow-ups (e.g., "what's the mechanism behind that?", "can you give an example?") rather than complete. It will only complete when the student has reached E, plateaued, or hit the time limit.

Caveats worth flagging:

• Type-check passes, but this is a prompt change whose real effect can only be observed by running the assessment. The repo has tools/assessment-test for this exactly (adversarial harness per CLAUDE.md), but it's expensive — many LLM round-trips per persona. Worth a single-persona smoke run (--persona good-student --assessment korvath-procedure) before trusting the change broadly.
• The turnInfo param is available in the prompt but never currently passed by assessment-chat.ts, so the time-bound fallback language is latent. The real time cap is still attempt.timeLimit enforced in assessment-chat.ts:170-172.

Ready to commit or want to iterate on the wording first?

I'll add a hill-climbing-student persona — same knowledge as good-student, but released gradually in response to probing follow-ups. This is the direct test for the new evaluator behavior.

Let me run the harness with this new persona to verify the evaluator behavior change actually works.

The hill-climbing student took 5 turns and reached E with all 6 criteria met — exactly the behavior we wanted. Let me peek at the transcript to verify the evaluator was actually probing, not just accepting early answers.

The evaluator pushed 5 substantive turns before completing — exactly the behavior we wanted. Let me run the remaining personas to verify we haven't regressed other cases.

Harness running all 11 personas in the background — expecting ~15-20 minutes. I'll report back when it completes.

2 of 11 personas done, both passing. Will report when harness completes.

Let me find where CBTF session IDs are wired up.

Let me see if there are any recent exam-access grants in the dev DB that would reveal next week's exam UUID.

Only the mock grant exists in dev. Let me check prod for real upcoming grants — the PrairieTest webhook likely fires there.

Prod query denied (fair). Here's what I need from you to wire this up:

The change is small: update content/assessments/cbtf-test-assessment.md to set examUuid: <next-week-session-uuid> (currently test-exam-uuid, which is a placeholder). That makes the CBTF middleware match against the real PrairieTest exam UUID so any student with a live allow_access grant for that exam can open the test assessment.

Two things I need from you:

1. The actual exam UUID for next week's CBTF session from PrairieTest. The system uses the exam_uuid field from PrairieTest webhooks — you can grab this from the PrairieTest admin UI for the session, or run the prod query yourself: bun run db:query prod "SELECT DISTINCT exam_uuid, MIN(start_at), MAX(end_at) FROM exam_access_grants WHERE event_type='allow_access' AND end_at > NOW() GROUP BY exam_uuid ORDER BY 2;"

2. Deploy target: dev or prod? You're going to CBTF today but the URL you shared earlier was dev-quizzes.*. PrairieTest webhooks fire to a single environment (whichever is configured in PrairieTest) — if webhooks go to prod, the change needs to land on prod; if they go to dev, this is a dev-only change.

Once you paste the UUID and say which env, I'll edit the frontmatter, type-check, and prep the deploy.

Saving that as a project note so we revisit if needed.

Noted and saved. Ready to commit the evaluator prompt + hill-climbing persona + UUID wiring when you say.

Untracked .claude/scheduled_tasks.lock is Claude Code runtime state. I'll commit in three logical chunks (evaluator change, UUID wiring, version bump) and ask about the lock file after.

Three commits made on dev_quizzes:

• e11a618 — evaluator prompt + hill-climbing persona
• 1e6d01c — CBTF UUID wiring
• 3dd1cf4 — version bump to 2026.4.29

Untracked: .claude/scheduled_tasks.lock is Claude Code's background-task state (owns lock info for scheduled wake-ups/monitors). It changes every run. The sibling .claude/commands/ and .claude/skills/ files are tracked (you author those), so we just need to ignore the lock file. Want me to add .claude/*.lock to .gitignore?

Committed f8a1f14. Working tree clean.

Swapped to the Exam 1 UUID (6753ef30-b22f-459b-9c77-41e3ec32c9a1, Feb 11–13 entry in prairietest.ts) in both the assessment frontmatter and the coupled e2e EXAM_UUID. Type-check passes. Ready to commit when you say.

I grabbed it from content/spring2026/prairietest.ts — the first entry (Feb 11–13 window, 6753ef30-...). I assumed "Exam 1" meant "first row in that file," which was wrong. The file doesn't contain c9b96219-... at all, so this UUID lives somewhere else (or the file is out of date).

Fixing now, then let me know if we should add the real Exam 1 entry to prairietest.ts.

Let me update my memory so I don't make the same assumption again.

Memory updated. UUID swapped in the assessment and the coupled e2e test, type-check clean. Ready to commit.

Also — if you want Exam 1's session added to prairietest.ts (so next time I can look it up), paste the start/end window and I'll append the entry.

Got it. Standing by for commit instruction.

No 403s in api or web logs. Let me check the ingress/nginx layer and confirm quizzes routing.

Changing verifyPrairieTestSignature to return a reason on failure, then logging it at the webhook route.

Now update the tests to match the new return shape, then run tests + typecheck.

Ready. Tests pass, type-check clean. Since the goal is to see this in prod logs ASAP:

• Files to commit: webhook-verify.ts, webhook-verify.test.ts, prairietest.ts route
• Then: bun run deploy:prod (full pipeline ~several minutes) or just bun run restart:prod if you want to skip and use whatever's already built

Say "go" and I'll commit + deploy. Or you can take over with:

git add apps/api/src/lib/webhook-verify.ts apps/api/src/lib/webhook-verify.test.ts apps/api/src/routes/webhooks/prairietest.ts && \
git commit -m "Log webhook signature failure reasons" && \
bun run deploy:prod

Once deployed, PrairieTest will keep retrying every ~10s

Clear signal: the x-prairietest-signature header is completely absent from incoming webhooks. Body is arriving (323 bytes, matches a real payload), but no signature header at all:

reason: "missing_header_parts"
hasTimestamp: false
hasSignature: false
headerKeys: []
headerLength: 0
headerPresent: false
bodyLength: 323

This almost certainly means one of:

1. PrairieTest's webhook config has its signing secret cleared/removed — with no secret configured, PrairieTest sends the payload unsigned.
2. PrairieTest is sending the signature under a different header name (e.g., they renamed it in a version update).
3. Something upstream is stripping the header — nginx ingress or a proxy.

Fastest way to distinguish #1 vs #2 vs #3: log the full list of incoming header names (not values — no secrets that way) and a preview of the body so we can see what PrairieTest is actually sending. Want me to add that one-line diagnostic and re-deploy? It'll tell us in one retry cycle.

Alternatively, check your PrairieTest admin UI now — is the webhook secret still populated there? If the secret field is blank, that's the whole answer.

Possible — let me check the ingress config for header manipulation.

Clean. Ready to commit + deploy. Going ahead since you asked to move quickly.

Committed 4be12c4. The new diagnostic will log:

• All incoming header names (sorted, no values)
• First 200 chars of body
• The existing reason code + details

Go ahead with bun run deploy:prod and paste the next warning line when it lands — we'll see immediately whether PrairieTest is using a different header name, the edge nginx is stripping it, or it's really absent end-to-end.

Two bugs revealed, not one.

Bug 1: Header name drift. PrairieTest sends prairietest-signature (no x- prefix). Our code reads x-prairietest-signature. The x- convention was deprecated a few years back and PrairieTest apparently moved off it.

Bug 2: Payload format drift. The body preview shows:

{
  "id": "515de02c-23f8-485a-acdd-50f8ad039e5e",
  "api_version": "2023-07-18",
  "created": "2026-04-23T14:46:43.847Z",
  "type": "deny_access",
  "data": { "end": "...", ... }
}

Our parser (apps/api/src/routes/webhooks/prairietest.ts:33-34, 45-65) expects top-level event_type, event_id, user_uid, exam_uuid, start_date, end_date. The new format uses type, id, and nests the rest under data. Even if we fix the header, the parser would reject every event as malformed.

So the integration was built against an older PrairieTest API version and needs both a header rename and a payload rewrite.

Proposed fix (minimal, compatible with the observed format):

1. Read signature from prairietest-signature (fall back to x-prairietest-signature for safety).
2. Change parser: payload.type, payload.id, then pull user_uid/exam_uuid/deny_uuid/start_date/end_date/cidr_blocks from payload.data.
3. Keep the onConflictDoNothing idempotency on id.

Before I touch the parser, I need to see the full body (200 chars truncated it mid-data). Two options:

• You paste the full webhook body from PrairieTest admin (or a trace of the request)
• I bump the bodyPreview cap to 1000 chars, redeploy, wait one retry cycle, and get the full payload from logs

Which do you want?

hasActiveDeny is dead code. Safe to match the reference and just ignore deny events. Writing the fix now.

Let me verify the e2e test that sends mock webhooks matches the new format.

Updating the webhook security tests to match the new payload shape and header name.

Type-check passes. Summary of the end-to-end fix:

apps/api/src/lib/webhook-verify.ts — structured result with reason codes (from the earlier diagnostic commit)

apps/api/src/routes/webhooks/prairietest.ts:

• Read signature from prairietest-signature, fall back to x-prairietest-signature for safety
• Parse the new PrairieTest payload shape (type, id, data.*)
• Drop deny-event persistence (match the cs124 reference — hasActiveDeny was dead code here, so this is a safe simplification)
• Kept diagnostic logging for future drift

testing/e2e/tests/cbtf-assessment.spec.ts:

• Rewrote all 9 webhook-security cases to use the new payload shape
• Added a test asserting the legacy x-prairietest-signature header fallback still works

Ready to commit + deploy. Once deployed, the retrying PrairieTest event from CBTF will succeed on the next tick, the allow grant will land, and the assessment will open.

Webhooks are verifying successfully now. Three deny_access events that had been stuck in retry hell got accepted and correctly ignored:

[09:51:18.051] INFO (webhook:prairietest/1): Ignoring non-allow_access event
    eventType: "deny_access"
    eventId: "bea49d3d-66f4-425e-bfad-d1d17ab29b43"
...

No more Invalid webhook signature warnings — signature verification is working with the new format.

But I haven't seen an allow_access event yet — the queue only had deny events backed up. To confirm the grant flow is fully working, fire an allow_access from PrairieTest (or have the CBTF re-grant your session). You should then see a log line like:

INFO (webhook:prairietest/1): Grant stored
    eventId: "..."
    userUid: "..."
    examUuid: "c9b96219-c0ef-47b7-a982-1d8428fd079d"

And at that point the assessment should open for you at quizzes.usingandunderstanding.ai.

Only deny events are arriving, no allow. That explains it — PrairieTest fired the allow_access event earlier when webhooks were still failing with 401 signature errors, and it's given up retrying. Only the deny events are still in their retry queue.

Fastest way to unblock yourself in CBTF right now: use the "Start Session" button on the assessment page (the admin mock-grant endpoint we fixed earlier this morning) to grant yourself access immediately — no PrairieTest round-trip needed.

Longer path if you want a real PrairieTest-originated grant: ask CBTF staff to re-issue the allow for your session on the PrairieTest side. Now that our webhook handler is correct, the next allow_access will land and you'll see a Grant stored log line.

Let me check for any newer events.

Good catch — the message should lead with the event type, not bury it. I'll also add a "received" log at the top so we can see every webhook even if downstream logic has a bug.

Looking at the new logs, these really are deny events, not mislabeled allows. With the improved dataKeys output:

[09:56:26.341] INFO: Webhook received: deny_access
    eventType: "deny_access"
    eventId: "0e758d7d-..."
    dataKeys: [ "end", "start", "deny_uuid", "cidr_blocks" ]

An allow would have user_uid and exam_uuid in dataKeys — these have deny_uuid and no user_uid at all. PrairieTest is sending bulk session-level denies (revoking prior grants), not per-user allows. Two of those fired right after redeploy at 09:56:26 and 09:56:27.

No allow_access has arrived since. The reissue either:

• Only generated deny events so far (PrairieTest sometimes batches denies first, then allows — worth waiting another 20s to see if anything lands)
• OR the reissue didn't actually create a per-user allow grant on the PrairieTest side

Meanwhile — fastest way to unblock yourself at CBTF right now is still the Start Session button on the assessment page (admin mock-grant). Once you click it, the assessment opens immediately with your email tied to Exam 1's UUID. Any real PrairieTest allow that lands later will just be additive.

Yes, [redacted] is correct. The route is mounted at apps/api/src/index.ts:147:

app.route("/api/webhooks/prairietest", prairieTestWebhookRoutes);

And we know deny events are reaching it fine — they showed up in the logs with our diagnostic info. So the URL + ingress + middleware path all work for denies.

If allows are configured to go to a different URL in PrairieTest (e.g. a legacy endpoint, or a separate "test" vs "prod" webhook), that would explain why denies arrive but allows don't. The cs124 reference you showed me (servers/questionable/server/cbtf.ts) registers two endpoints:

router.post("/cbtf", async (ctx) => handleEvent(ctx, false))
router.post("/cbtftest", async (ctx) => handleEvent(ctx, true))

Worth checking the PrairieTest admin to see whether there are two webhook URLs configured (one for the live exam, one for the test session), and whether both are pointing at /api/webhooks/prairietest in our system. If PrairieTest is sending allows to a different path and getting a 404, we'd never see them.

Here's the head-to-head on the two implementations:

The one thing that really stands out: cs124 runs TWO webhook endpoints with TWO secrets (prod /cbtf + test /cbtftest), we run one.

If PrairieTest is set up with the same dual config — a live-exam webhook pointing at /cbtf and a test webhook pointing at /cbtftest — then:

• Whichever one points at /api/webhooks/prairietest on our side is what we're receiving (the denies)
• The other one is hitting a 404 on our api pod (where allow_access might live)

Two things to check:

1. In PrairieTest admin, how many webhook URLs are configured for our org? If there are two, we need to reconcile both paths on our end.
2. Is the signing secret the same for both? If not, we'd need a second env var and a way to route signature verification by endpoint.

If PrairieTest is configured with a single URL and is meant to send both event types to it, then the path isn't the mystery — the allows genuinely aren't being sent. But given the cs124 pattern has two, it's worth ruling out first.

OK — setting aside the endpoint split, here's the comparison on everything else:

Matching, byte-for-byte:

• Signature header name (prairietest-signature)
• HMAC-SHA256 of ${timestamp}.${rawBody}
• Event parsing: top-level id/type/api_version/created, nested data.{user_uid,user_uin,exam_uuid,start,end,cidr_blocks}
• Deny-event behavior: accept, no persistence, return empty OK
• Allow-event behavior: validate, then store

Different but not a bug:

• Timestamp tolerance (we allow 300s, cs124 allows 10s). Our side accepts anything cs124 would; the reverse isn't true.
• Signature header parser: cs124 uses an anchored regex, we split on ,. Both accept the real t=…,v1=… format.

Nothing else I can see in the webhook path is behavior-relevant.

Given that implementations are equivalent on the handling side, and denies are verifying/arriving but allows aren't, the issue is upstream of our webhook code — something PrairieTest is (or isn't) sending. Worth investigating on that side:

1. Does a reissue action actually fire a fresh allow_access webhook, or does it only deny? (PrairieTest may retry unsent events but reissue a single operation differently than you'd expect.)
2. Are allow events signed with the same secret as deny events? If they use a different key per environment and we only have one, signature verification would fail for allows — but we'd see that in our logs now (we'd log hmac_mismatch with full diagnostic details). Since we're seeing zero Invalid webhook signature warnings post-redeploy, the allows aren't even reaching our handler to fail verification — they're not being sent.

So: diff on our side is clean. Next step is verifying PrairieTest is actually firing allow_access on reissue, or surfacing a delivery log from their side.

Ready to deploy. Summary of what's built:

New table prairietest_webhooks (migration 0027_mushy_ser_duncan.sql):

• id, received_at, source_ip, headers (jsonb), body, body_size
• signature_valid, signature_failure_reason, event_type, event_id
• status (oversized | invalid_signature | invalid_json | missing_fields | ignored | grant_stored | error)
• notes (freeform)
• Indexes on received_at, event_id, status

Handler (apps/api/src/routes/webhooks/prairietest.ts):

1. Body size sanity check (reject >64KB with 413)
2. Every request writes one audit row with final outcome — even rejected ones
3. Verbose INFO log on receipt (Webhook received: <type> with dataKeys, apiVersion, created, sourceIp)
4. Body truncated to 16KB in the audit row (with original size preserved in body_size)
5. Audit insert is wrapped in try/catch so a DB hiccup can't break the webhook path

To deploy (two steps):

bun run db:migrate:prod   # applies 0027 migration
bun run deploy:prod       # rolls out the new handler

Once live, query anything with:

SELECT received_at, status, event_type, signature_valid, event_id, notes
FROM prairietest_webhooks ORDER BY received_at DESC LIMIT 50;

Want me to also add a quick SELECT headers::text FROM prairietest_webhooks WHERE event_type='allow_access' query script for you once it's collecting data?

Sounds good. Migration + handler are ready whenever you want to deploy.

Yes, both are in good shape:

Tests (testing/e2e/tests/cbtf-assessment.spec.ts): updated to the new payload format when I rewrote the parser. All webhook tests use { id, type, api_version, data: { user_uid, exam_uuid, start, end } } and the prairietest-signature header. One test intentionally uses the legacy x-prairietest-signature header to exercise the backward-compat fallback path.

Start Session / mock-grant (apps/api/src/routes/admin/assessments.ts:289-299): no change needed. It writes directly to exam_access_grants with the same schema fields that existed before. The format drift was in the webhook parsing layer, not in the grant table. Mock-grant bypasses the webhook path entirely, so it was never affected.

One small gap to flag: mock-grants won't appear in the new prairietest_webhooks audit table (since they don't go through that handler). If you want all grant origins visible in one place later, we could add a "synthetic" audit row on mock-grant too — but that's additive, low urgency, and can wait.

Good call. Let me check how the api binds so I know the right internal URL for the self-call.

API Error: 529 Overloaded. This is a server-side issue, usually temporary — try again in a moment. If it persists, check status.claude.com.

Now I'll add a signing helper to webhook-verify.ts and rewrite /mock-grant/start to route through the real webhook.

Done. Summary of what changed:

apps/api/src/lib/webhook-verify.ts — added signPrairieTestPayload(body, secret, ts?) helper that returns a valid t=...,v1=... header string.

apps/api/src/routes/admin/assessments.ts /mock-grant/start:

• Builds a synthetic allow_access payload in real PrairieTest shape ({ id: "mock-<uuid>", api_version, created, type, data: { user_uid, exam_uuid, start, end, cidr_blocks } })
• Signs it with the server's PRAIRIETEST_WEBHOOK_SECRET (secret stays server-side)
• POSTs to http://[ip]:${PORT}/api/webhooks/prairietest
• The webhook handler audits the event in prairietest_webhooks and stores the grant, same as any real PrairieTest allow
• Reads the newly-inserted grant back by eventId and returns it, so the caller's response shape is unchanged

Stop path untouched — real PrairieTest revokes by expiring end rather than sending a meaningful deny, so the in-place update remains the closest-to-reality match.

Existing e2e assertions (body.grant.examUuid, eventType, start/end duration) continue to hold.

Type-check passes, webhook-verify unit tests pass. Migration 0027_mushy_ser_duncan.sql still covers the audit table.

Ready to deploy when you want.

Current coverage:

Those will run against the new pathway, so they'll fail fast if the round-trip breaks — but they don't verify the round-trip happened. Specifically:

Missing but worth adding:

1. Unit test for signPrairieTestPayload round-tripping with verifyPrairieTestSignature — cheap sanity check that the signer produces something the verifier accepts.
2. E2E: mock-grant writes an audit row to prairietest_webhooks with status: "grant_stored" — this is the whole point of the refactor. If we don't assert on this, a regression that silently bypasses the webhook path (e.g., someone reverts to the direct DB insert "for speed") would slip through.
3. E2E: oversized-body rejection returns 413 and logs an audit row with status: "oversized". Cheap, guards the new sanity limit.

Skippable for now: deep property-based tests on the signature format, the signature_failure_reason enum codes (we'd be asserting on implementation detail).

Want me to add those three? Totals maybe 60 lines across the two test files.

Now the three tests.

Now the two e2e tests.

Now the oversized-body test in cbtf-assessment.spec.ts.

Three tests in, type-check + unit tests green. Breakdown:

apps/api/src/lib/webhook-verify.test.ts (+3 tests, now 13 total):

• signer output is accepted by verifier — round-trip sanity
• signer output has the expected shape — asserts t=...,v1=<64-hex> format
• verifier rejects signer output with wrong secret — guards against accidental no-op

testing/e2e/tests/assessment-limits.spec.ts (+1 test):

• routes through the webhook handler and writes an audit row — calls mock-grant, then queries the audit endpoint by eventId and asserts status="grant_stored", signatureValid=true, correct eventType. Catches any future reversion to the bypass path.

testing/e2e/tests/cbtf-assessment.spec.ts (+1 test):

• oversized body returns 413 and writes an oversized audit row — posts 80KB payload, expects 413, then verifies an audit row with status="oversized" and matching bodySize.

Supporting e2e endpoints (apps/api/src/routes/e2e.ts):

• GET /api/e2e/prairietest-webhooks?eventId=...&limit=N — fetch audit rows
• DELETE /api/e2e/prairietest-webhooks — cleanup (not wired into current tests, but matches the pattern of the exam-access-grants cleanup endpoint for future use)

Running the e2e suite locally now would need the dev server + new migration applied. Ready to commit whenever.

Splitting into two logical commits: webhook format overhaul (parser + audit table + tests) and mock-grant refactor (routes through webhook pathway).

Two commits on dev_quizzes:

• d67e9f4 — PrairieTest format update + audit table (10 files, includes migration 0027)
• 26ffdd1 — Mock-grant through webhook pathway

Working tree clean. Ready for bun run db:migrate:prod then bun run deploy:prod when you are.

Likely cause: the migration hasn't been applied locally. The audit-row test needs prairietest_webhooks to exist, and the destructure blowing up on undefined is what you'd see if the endpoint 500'd on "relation does not exist."

Table doesn't exist locally. Applying migration.

Table exists now. Re-run the failing test to confirm the fix.

All 52 cbtf-assessment tests pass now. Root cause was the prairietest_webhooks migration not being applied to the local DB — fixed with bun run db:migrate. Same step (bun run db:migrate:prod) is still required before the deploy I mentioned earlier.

In CBTF, students go through the quiz-api subdomain: quiz-api.usingandunderstanding.ai → api-service:3001. The quizzes.usingandunderstanding.ai web subdomain pairs with it.

The split exists because the edge nginx in front of those two hosts injects x-cbtf: true on inbound requests, which our cbtfDetection middleware (apps/api/src/middleware/cbtf.ts) uses to flip isCbtf=true and then enforce the route whitelist via cbtfRestriction. api.usingandunderstanding.ai doesn't get the header, so requests through it aren't treated as CBTF.

That's also why the cbtf e2e tests distinguish API_URL (regular) from QUIZ_API_URL (CBTF-flagged) — the latter exercises the restriction path.

Two places to track this: an inline TODO next to getPresentStudentCount (matches the pattern from recent commits) and a backlog memory entry.

Logged:

• Inline TODO at apps/api/src/socket.ts above getPresentStudentCount
• Backlog memory project_presence_hysteresis.md, indexed in MEMORY.md

Ready to commit alongside whatever else is pending, or separately.

Implementing hysteresis. Need an override mechanism so the existing presence.spec.ts doesn't have to wait 30s, so I'll add an e2e endpoint to tune the window.

Now the e2e endpoint for tuning the window, and update the presence test.

Let me also add a dedicated hysteresis-behavior test before running everything.

Those TS errors are in unrelated spec files. Let me confirm my changes didn't add any, then run the presence tests.

Both tests pass. Let me stop the dev server.

API type-check clean. Summary of the hysteresis implementation:

apps/api/src/socket.ts:

• Module-level HYSTERESIS_MS (default 30s, overridable via PRESENCE_HYSTERESIS_MS env var)
• Per-room Map<userId, lastSeenAt> tombstone store with markStudentRecentlyDisconnected / clearStudentRecentlyDisconnected helpers
• Added disconnecting handler (fires before socket.rooms is cleared, unlike disconnect) — records tombstones for every meeting room the socket was in
• room:join now clears the tombstone so returning students don't linger post-hysteresis
• room:leave also records a tombstone (explicit leave within hysteresis still holds)
• getPresentStudentCount unions live sockets with tombstones inside the window; prunes expired entries opportunistically
• Exported setPresenceHysteresisMs / getPresenceHysteresisMs for test overrides

apps/api/src/routes/e2e.ts:

• POST /api/e2e/presence/hysteresis { ms: 0..60000 } — tunes the window for e2e tests (dynamic import avoids pulling socket deps into every e2e route)

testing/e2e/tests/presence.spec.ts:

• Existing dedupe test now sets hysteresis to 500ms so tab-close drops reflect within one SWR poll cycle
• New hysteresis window holds the count steady through a brief disconnect test — 8s window, verifies the count holds at 1 during the window and drops to 0 after it elapses
• afterEach restores the 30s default so later tests aren't affected

Both presence tests pass (presence project: 7/7 green, 35.5s). Ready to commit.

Committed 33270c5 on presence_hysteresis. Working tree clean.