`time.LoadLocation` is called from
backend/internal/server/handlers_public_auth.go:108 (confirm-email-code)
and backend/internal/user/account.go:218 (user.settings.update). Both
runtime images shipped today have no tzdata — production
backend/Dockerfile uses gcr.io/distroless/static-debian12:nonroot, and
local-dev tools/local-dev/backend.Dockerfile uses alpine:3.20 without
the optional tzdata apk — so the container-side binary resolves only
the no-data fallback (UTC and fixed offsets) and rejects every real
IANA zone with HTTP 400 `invalid_request: time_zone must be a valid
IANA zone`.
Adding `import _ "time/tzdata"` to backend's main is the idiomatic
Go fix: the binary embeds the IANA database, time.LoadLocation works
on every base image, no Dockerfile changes needed. Cost is ~800 KB
of binary growth — invisible next to the existing /usr/local/bin/backend
size and well below any container layer threshold.
The OpenAPI spec already documents the field as "IANA time-zone
identifier" (gateway/openapi.yaml:205, backend/openapi.yaml:2334)
and the UI sends Intl.DateTimeFormat().resolvedOptions().timeZone,
so neither the contract nor the client needs a change.
Why this slipped through: backend unit tests run as a host Go test
process (developer's tzdata covers them), Playwright tests mock the
gateway (backend never reached), and the integration suite — the only
layer that exercises the real backend container — uses
RegisterSession which hardcoded `time_zone="UTC"`. Switching that
default to "Europe/Berlin" makes every integration scenario that
enrols a pilot exercise the tzdata path, so the next regression
surfaces in the integration run instead of escaping into manual
smoke. (The integration suite is not in the per-PR workflow yet; that
gap is tracked separately.)
Verified end-to-end against `tools/local-dev`:
- Europe/Amsterdam, Asia/Tokyo, America/Los_Angeles → 200 +
device_session_id (was 400 before this patch).
- Mars/Olympus still → 400 (validation behaviour unchanged).
Host tests: backend/internal/{auth,user,config} green.
UI: pnpm test 14/14, CI=1 pnpm exec playwright test 44/44.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Phase 4 replaced the gateway's authenticated edge listener with a
Connect-Go HTTP/h2c bootstrap that natively serves Connect, gRPC,
and gRPC-Web. Sweep the integration suite so test names, comments,
and helper docs match the new transport posture: rename
TestUserAccount_GetThroughGatewayGRPC to TestUserAccount_GetThroughGatewayEdge,
flip "authenticated gRPC" / "signed gRPC" / "gateway gRPC" comments
to "authenticated edge", and align testenv doc strings.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Ilia Denisov