After Phase A (#442) moved the journal callback token off the browser,
the token was still replayable on the wire until \`exp\` (7 days). This
PR makes each token strictly single-use.
Changes:
- **\`journal.consumed_jwt_jti\` table** — \`jti TEXT PRIMARY KEY,
consumed_at TIMESTAMPTZ, expires_at TIMESTAMPTZ\`. Picked up by
drizzle-kit push on deploy.
- **\`createRouteToken\` now sets a \`jti\` claim** (\`randomUUID()\`).
- **\`verifyRouteToken\` atomically consumes the jti** via
\`INSERT … ON CONFLICT DO NOTHING RETURNING jti\`. Postgres
serializes the insert, so exactly one concurrent caller wins; the
rest see an empty result and throw \`TokenAlreadyConsumedError\`.
Tokens without a \`jti\` claim (i.e. minted before this PR) are
also rejected — the right call: any in-flight legacy token sitting
in a planner session is replayable, and we'd rather fail-loud than
silently grandfather them in.
- **\`consumed-jti-sweep\` job** — daily 03:45 UTC cron that
\`DELETE WHERE expires_at < now()\`. Keeps the table tiny; offset
from the other purge jobs to spread load.
- **e2e replay test** — \`integration.test.ts\` now exercises a
same-token double-submit and asserts the second returns 401 with
\`/consumed|already/i\`.
UX implication worth flagging: a user who clicks \"Save\" twice (or whose
network retries a failed POST) sees an error on the second attempt.
They go back to the journal for a fresh \"Edit in Planner\" link.
Full repo: pnpm typecheck / lint / test all green (177 + 31 integration).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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