Fresh-eyes review round with 6 independent agents (money-safety, concurrency,
Square wire parity, security, frontend flow, testing-gaps). Every finding was
independently verified against the code before fixing. All backend changes
now carry full test suites (10+ new tests, each verified to FAIL without its
guard). All 20 packages green, race detector clean.
Money-safety:
- Gift-card purchase refunds no longer create money: manual refunds of a
no-booking (gift-card purchase) payment are rejected with a clear message
in the direct handler AND never re-issued by the sweep-resume path
(processManualPaymentGroup skips them; reconcile-then-fail, no re-issue).
- BuyGiftCard no-client-key fallback: derived deterministically under the
advisory lock (pending-row reuse fixes lost-response double-charge;
completed-row sequence advance preserves distinct-purchase collapse fix).
- Terminal completion is never unrecorded: activeTerminalCheckoutID now calls
recordUntrackedTerminalPayment when a provisional (tmp-) checkout is found
COMPLETED at Square (previously only marked the row COMPLETED — a lost poll
left the payment invisible and unrefundable).
- Sweep: provisional tmp- checkout rows are resolved against Square first
(COMPLETED → record; live → keep guard; NOT_FOUND/CANCELED → fail;
ambiguous → leave pending) instead of blind-failing a possibly-live
checkout. recordUntrackedTerminalPayment re-checks the booking status
(FOR UPDATE) and refuses to record on a cancelled booking, inserting a
critical_payment_log admin notification instead. Till-sale post-charge
UPDATE now requires status='pending' (no resurrection of a clawed-back sale).
Frontend (Svelte 5):
- UserPaymentModal keeps CardSelection mounted through processing (bind:this
ref + Square iframe survive the loyalty/tokenize awaits) — new-card
payments work again.
- BookingFlow clears the cached nonce/verification pair on any failure (retry
re-tokenizes fresh; idempotency key retained for dedup); 409 'already paid'
refetches the booking and reconciles depositPaid so the confirmation gate
opens; Back button disabled during processing.
- Synchronous double-submit guards on buyGiftCard/redeemGiftCard/submitTip.
Square wire parity (mock vs real):
- processing_fee sign unified (negated at paymentFromSquare; mock agrees).
- SimulateSourceUsed (SOURCE_USED, 400) matches real CreateCard.
- GetCardsOnFile excludes disabled cards (matches ListCards).
- ForcePaymentStatus toggle + tests prove the charge path can't be status-blind.
- CreateCheckout rejects empty device_id (env fallback SQUARE_TERMINAL_DEVICE_ID);
completed terminal checkout's payment resolvable by id.
Security:
- 2FA attempt-map data race fixed: lastAt is atomic.Int64 (nanos) — eviction
scan reads race-free; concurrent verify+evict tests under -race.
- Backend refuses to start on weak/placeholder JWT_SECRET_KEY (<32 chars or
known public placeholders) with openssl rand -hex 32 guidance.
- Dockerfile no longer COPYs .env (secrets injected via compose env_file).
- SabreDAV requires DAV_ADMIN_PASSWORD (no admin/admin default); compose
fails at config time when missing.
Testing gaps closed (each verified to FAIL without its guard):
- refunded-dedup 409 (CreateBookingPayment), keyed sweep past-retention
blind-fail, reconcile status-switch (CANCELED/FAILED/APPROVED/PENDING/unknown
in both by-key and by-id paths), resolveChargeSource Square-failure branches,
structured 500 / CARD_DECLINED / cancelled-context E2E (row stays pending),
deriveBookingPaymentIdempotencyKey >45-char truncation, webhook
findPaymentByDisputeID fallback, clawbackOneTillSale non-gift-card branch,
dispute.evidence / terminal.checkout dispatch.
Infra:
- local-dev-2.sh fails loudly on port-5432 squatters / docker compose failures
(previously died silently under ERR_EXIT with hidden output).
- Test harness defaults SQUARE_TERMINAL_DEVICE_ID; money_safety_fixes_test.go
gained the missing build tag.
Verification: go test -tags test,dev -count=1 -parallel 8 ./... (20/20 ok),
-race clean on 2FA + payments money paths, go build ./... + -tags dev, go vet
clean, svelte-check 0 errors, env-docs gate OK (36 vars), docker compose
config valid.
compose.yml backend service now reads the root ./.env (which README instructs users to create) instead of the nonexistent backend/.env. Promote R2_ACCESS_KEY/R2_SECRET_KEY/R2_BUCKET/R2_PUBLIC_URL to active vars (prod S3 reads all four via getEnv) and document the webhook URL/signature-key exact-match requirement with fail-closed (503/403) wording.
- Add backend/internal/s3/ with build-tag pattern (dev vs prod)
- Dev: Uses local Rustfs container (S3-compatible)
- Prod: Stub for R2 Cloudflare (add AWS SDK to implement)
- Add S3 env vars to .env.example and .env
- Add Rustfs service to compose.yml
- Add Rustfs reset to local-dev-2.sh (wipes data on each run)
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