fix: actually invalidate the session on OAuth logout

[heskew]

clearOAuthSession gated on typeof session.delete === 'function', but the real Harper request.session is a shallow copy of the hdb_session record exposing only .update (a persisting put) — never .delete (confirmed against harper@5.1.9, security/auth.ts:110). So the delete branch never ran, and the in-memory fallback (session.user = null) was never persisted: after an explicit logout — or when a token is expired/revoked and clearOAuthSession runs — the stored hdb_session record kept authenticating until cookie TTL.

Fix: invalidate by persisting session.update({ user: null, oauth: null, oauthUser: null }), mirroring Harper's own logout() (security/auth.ts:381). The next request resolves session.user to no user. Falls back to an in-memory clear only when no .update exists (non-session transports).

Tests updated across handlers / sessionValidator / withOAuthValidation — several had encoded the inverted delete-based model (asserting session.delete(id) and in-memory clears that never actually persisted). Full suite: 1157 unit + 15 integration, 0 fail.

[github-actions]

Reviewed; no blockers found.

Suggestions (non-blocking)

• src/lib/withOAuthValidation.ts:112 — clearStaleOAuth should also clear session.user = null for in-memory consistency, matching the updated clearOAuthSession logic.
• src/lib/handlers.ts:546 — The session.update({ user: null }) is a full-replace write without a version/CAS check; a concurrent token-refresh write could resurrect the session.

[gemini-code-assist]

Code Review

This pull request updates the clearOAuthSession function to use session.update instead of session.delete to invalidate sessions, aligning with the actual API of Harper's hdb_session record which only exposes .update. This ensures that a null-user record is persisted to invalidate the session, rather than attempting a non-existent delete method. Corresponding unit tests have been updated to mock and assert the new .update behavior and verify that session properties are correctly set to null upon invalidation. There are no review comments, and I have no additional feedback to provide.

[claude]

Reviewed; no blockers found. This push (0cb731e) is comment-only — trims JSDoc/inline comments in handlers.ts and withOAuthValidation.ts with no logic change; prior threads remain resolved.

[heskew]

Addressed in 4c20cc1: in-memory session fields are now cleared unconditionally on logout, closing both in-memory-state blockers. The CAS-race suggestion is pre-existing (tracked in #212). All threads resolved.

[heskew]

Review at 4c20cc1: no blockers.

I traced the implementation against Harper 5.1.9. Persisting update({ user: null }) is the correct full-replacement invalidation, the session.id guard avoids minting rows on anonymous logout, and the unconditional in-memory clear means the current request no longer sees stale OAuth identity. The stale-write race tracked in #212 is pre-existing and remains a separate follow-up, not a blocker here.

Two non-blocking cleanup items:

• The PR body still says the final implementation persists user/oauth/oauthUser as null. The current code correctly persists only { user: null } and deletes oauth/oauthUser from the in-memory copy.
• test/lib/withOAuthValidation.test.js:1087-1093 still says the production update path does not mutate the in-memory session, which now contradicts both the implementation and the production-path test below it.

For the 1.x release train: keep this PR on main. Harper 4.7.19 assigns the live TableResource to request.session, so the existing 1.x session.delete(session.id) path is valid; Harper 5 creates the shallow copy that made this fix necessary. No mechanical 1.x backport is needed.

Validation: full local suite 1,157 passed / 2 skipped; explicit TypeScript check passed; lint has no errors; GitHub Node 22/24 unit and integration checks are green.