familysync/.planning/milestones/v1.1-phases/18-auto-timezone-detection-and-ability-to-change-timezone/18-02-SUMMARY.md

phase, plan, subsystem, tags, requires, provides, affects, tech-stack, key-files, key-decisions, requirements-completed, duration, completed

phase	plan	subsystem	tags	requires	provides	affects	tech-stack	key-files	key-decisions	requirements-completed	duration	completed
18-auto-timezone-detection-and-ability-to-change-timezone	02	api	timezone iana drizzle vitest tdd admin hono	phase provides 18-01 isValidIanaTimezone + getHouseholdTimezone (consumed by timezoneSchema + GET handler) phase provides 10-admin-role-settings adminRouter + requireAdmin + appConfig table	GET /api/admin/config/timezone — reads stored household timezone with isExplicitlySet flag PUT /api/admin/config/timezone — validates IANA string + upserts household_timezone in app_config POST /api/admin/config/timezone/seed — seeds only when unset (D-03 no-overwrite)	18-03-PLAN (broker rewire — reminderScheduler + outboxWorker import getHouseholdTimezone) 18-04-PLAN (PWA settings UI — consumes GET + PUT endpoints built here)	added patterns zValidator('json', schema) without noEchoHook for non-sensitive config (timezone is not a credential) Drizzle onDuplicateKeyUpdate upsert for config PUT (appConfig PK = key) SELECT-before-INSERT pattern for no-overwrite seed (D-03 — DO NOT use onDuplicateKeyUpdate for seed) requireAdmin positional coverage new routes appended after line-41 adminRouter.use('*', requireAdmin)	created modified apps/api/src/routes/admin.ts apps/api/tests/routes/admin.test.ts	timezoneSchema uses isValidIanaTimezone (from 18-01) in Zod .refine() — no noEchoHook needed (T-18-06: timezone is non-sensitive) GET /config/timezone reads row directly (not via getHouseholdTimezone) to compute isExplicitlySet from row?.value != null, then uses getHouseholdTimezone for the fallback value seed endpoint uses SELECT-then-INSERT (not onDuplicateKeyUpdate) to ensure D-03 no-overwrite is an explicit code path, not a silent race	D-01 D-02 D-03 D-04	3min	2026-06-15

Phase 18 Plan 02: Admin Timezone API Endpoints Summary

Three role-gated admin endpoints (GET + PUT + seed) added to adminRouter with server-side IANA validation via isValidIanaTimezone and D-03 no-overwrite seed semantics enforced by SELECT-before-INSERT

Performance

• Duration: 3 min
• Started: 2026-06-15T02:09:38Z
• Completed: 2026-06-15T02:12:39Z
• Tasks: 2 (TDD RED + GREEN)
• Files modified: 2

Accomplishments

• Added describe('admin timezone config') to admin.test.ts with 8 test cases covering all boundary conditions
• Implemented GET /api/admin/config/timezone, PUT /api/admin/config/timezone, and POST /api/admin/config/timezone/seed on the existing adminRouter
• All routes inherit the line-41 requireAdmin guard (Pitfall 9 / T-18-03) — no per-route auth addition needed
• timezoneSchema uses isValidIanaTimezone from Plan 18-01 in a Zod .refine() — no noEchoHook (T-18-06)
• PUT uses onDuplicateKeyUpdate for a true upsert; seed uses SELECT-then-INSERT to enforce D-03 no-overwrite
• 25/25 admin.test.ts tests pass; 366/366 full API suite green; tsc --noEmit clean

Task Commits

1. Task 1: RED — failing integration tests - f109b3c (test)
2. Task 2: GREEN — implement GET/PUT/seed timezone endpoints - 3bd6a5d (feat)

Files Created/Modified

• apps/api/src/routes/admin.ts — added appConfig + householdTimezone imports, timezoneSchema, and three new route handlers
• apps/api/tests/routes/admin.test.ts — added appConfig import + describe('admin timezone config') with 8 test cases + per-test afterEach cleanup

Decisions Made

• timezoneSchema does NOT use noEchoHook because timezone strings are non-sensitive (not credentials/PII); standard zValidator error responses are safe (T-18-06 accepted disposition).
• GET /config/timezone does a direct single-row read (not getHouseholdTimezone) so the handler can compute isExplicitlySet from row?.value != null before deciding whether to invoke the fallback chain — using getHouseholdTimezone would discard the "was it stored?" signal.
• POST /api/admin/config/timezone/seed uses a SELECT-then-INSERT (not onDuplicateKeyUpdate) so that D-03 no-overwrite is an explicit code branch, not an implicit race. The test asserts the stored value after a second seed attempt remains unchanged.

Deviations from Plan

None — plan executed exactly as written.

Issues Encountered

• Running pnpm --filter @familysync/api exec vitest run requires DB_ROOT_PASSWORD from .env sourced into the shell (the global-setup provisions familysync_test using the root credential). This is the established pattern from quick 260613-ndv and documented in familysync-dev-stack-setup.md.

Known Stubs

None — all three endpoints are fully wired to the database. No placeholder data.

Threat Flags

No new threat surface beyond the plan's threat model. All three endpoints are behind requireAdmin (T-18-03). IANA validation enforced by isValidIanaTimezone (T-18-04). No SQL injection surface — key is a hard-coded literal, value is IANA-validated, Drizzle parameterizes the insert/upsert (T-18-07).

TDD Gate Compliance

• RED gate: f109b3c — test(18-02): add failing integration tests for admin timezone endpoints
• GREEN gate: 3bd6a5d — feat(18-02): admin timezone GET/PUT/seed endpoints
• REFACTOR gate: N/A (implementation was clean on first pass)

Next Phase Readiness

• Plan 18-03 (broker rewire) can import getHouseholdTimezone(db) from ../lib/householdTimezone.js to replace the bare process.env.TZ ?? Intl… lookups in reminderScheduler.ts:247 and outboxWorker.ts:501,607.
• Plan 18-04 (PWA settings UI) can wire to GET /api/admin/config/timezone and PUT /api/admin/config/timezone. The seed endpoint is also available for the Phase 12 wizard auto-detect flow.

Self-Check: PASSED

• apps/api/src/routes/admin.ts — FOUND (modified)
• apps/api/tests/routes/admin.test.ts — FOUND (modified)
• Commit f109b3c — FOUND
• Commit 3bd6a5d — FOUND

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Phase: 18-auto-timezone-detection-and-ability-to-change-timezone Completed: 2026-06-15