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+---
+phase: 11-per-event-reminders
+plan: "03"
+subsystem: api/broker
+tags: [valarm, reminderLeadMinutes, tdd, schema, outbox, sync, expand, cal-13, cal-14]
+dependency_graph:
+  requires:
+    - "Plan 11-01 (buildTimedValarm, buildAllDayValarm, classifyValarms, extractValarms, computeAlertInstantUtc, NewEventParams extensions)"
+  provides:
+    - "reminderLeadMinutes in eventFieldsSchema (ingress validation)"
+    - "reminderLeadMinutes in outboxPayloadSchema (drain re-validation)"
+    - "hasExplicitReminder preserve-on-edit path in outboxWorker UPDATE branch"
+    - "VALARM wiring in buildVeventString calls (both UPDATE and CREATE branches)"
+    - "reminderLeadMinutesValue derivation + upsert in sync.ts"
+    - "reminderLeadMinutes on CalendarOccurrence (expand.ts)"
+    - "reminderLeadMinutes in GET /api/events select"
+  affects:
+    - "apps/api/src/routes/events.ts"
+    - "apps/api/src/broker/outboxWorker.ts"
+    - "apps/api/src/broker/sync.ts"
+    - "apps/api/src/broker/expand.ts"
+    - "Plan 11-02 (reminderScheduler — scheduler reads reminderLeadMinutes from DB)"
+tech_stack:
+  added: []
+  patterns:
+    - "hasExplicitReminder sentinel mirrors hasExplicitRecurrence WR-01 pattern"
+    - "Object.prototype.hasOwnProperty.call(fields, 'reminderLeadMinutes') for absent-vs-null distinction (D-08)"
+    - "classifyValarms(rawVevent) for series-level reminderLeadMinutes derivation in expand.ts"
+    - "computeAlertInstantUtc(start, leadDays, tz) for all-day absolute DATE-TIME trigger"
+    - "extractValarms(rawVevent) preserve-on-edit re-attachment via addSubcomponent"
+key_files:
+  created: []
+  modified:
+    - apps/api/src/routes/events.ts
+    - apps/api/src/broker/outboxWorker.ts
+    - apps/api/src/broker/sync.ts
+    - apps/api/src/broker/expand.ts
+    - apps/api/tests/broker/outboxWorker.test.ts
+    - apps/api/tests/broker/sync.test.ts
+    - apps/api/tests/broker/expand.test.ts
+decisions:
+  - "D-REMIND-ABSENT: absent field (not in payload) = no-change path (D-08); Object.prototype.hasOwnProperty.call distinguishes absent from null — mirrors WR-01 for VALARM preservation"
+  - "D-REMIND-EXPAND: reminderLeadMinutes derived inside expandOccurrences via classifyValarms(rawVevent) — self-contained; consistent with sync.ts derivation (both consume the same VEVENT source)"
+  - "D-REMIND-ALLDAY-LEADDAYS: all-day leadDays = reminderLeadMinutes / 1440 (consistent with D-05 mapping); computeAlertInstantUtc called at drain time (not enqueue) for correct DST"
+metrics:
+  duration_minutes: 8
+  completed_date: "2026-06-14"
+  tasks_completed: 3
+  files_modified: 7
+---
+
+# Phase 11 Plan 03: reminderLeadMinutes End-to-End Plumbing Summary
+
+`reminderLeadMinutes` round-trips end-to-end: `eventFieldsSchema` ingress validation → outbox payload drain → `buildVeventString` VALARM emission → Fastmail PUT; sync.ts parses native VALARMs into the DB column (scheduler ground truth); `CalendarOccurrence` surfaces the value for edit-mode picker pre-population.
+
+## Tasks Completed
+
+| Task | Description | RED Commit | GREEN Commit |
+|------|-------------|------------|--------------|
+| 1 | Schema field + outbox worker preserve-on-edit + buildVeventString wiring | 79f6871 | 4f42b75 |
+| 2 | sync.ts VALARM → reminderLeadMinutes upsert | cdca930 | 1cc0d72 |
+| 3 | Surface reminderLeadMinutes on CalendarOccurrence + GET select | 7df11d2 | e171431 |
+
+## Schema Field (eventFieldsSchema + outboxPayloadSchema)
+
+Both schemas now have:
+```typescript
+reminderLeadMinutes: z.number().int().min(0).nullable().optional()
+```
+
+Four-state semantics (D-08):
+- `absent` — field not present in payload; UPDATE branch preserves existing VALARM verbatim (D-08)
+- `null` — explicit "None" → VALARM cleared on write-back
+- `0` — same-day all-day (9 AM on event date); timed 0 = None (D-06)
+- `positive` — N minutes before event start (timed) or N/1440 days before (all-day)
+
+## hasExplicitReminder Preserve-on-Edit Path (CAL-14)
+
+Pattern mirrors the WR-01 `hasExplicitRecurrence` + `_preservedRrule` preserve path:
+
+UPDATE branch computes:
+- `const hasExplicitReminder = Object.prototype.hasOwnProperty.call(fields, 'reminderLeadMinutes')`
+- `!hasExplicitReminder` + rawVevent has VALARMs → `valarmsToPreserve = extractValarms(rawVevent)` (preserve verbatim via addSubcomponent)
+- `hasExplicitReminder` + allDay + value → `allDayAlertInstantUtcUpdate = computeAlertInstantUtc(start, lead/1440, tz)`
+- `hasExplicitReminder` + null → clear (no valarms, reminderLeadMinutes=null passed to buildVeventString)
+
+buildVeventString call extended with: `reminderLeadMinutes: hasExplicitReminder ? fields.reminderLeadMinutes : undefined`, `valarms: valarmsToPreserve`, `allDayAlertInstantUtc: allDayAlertInstantUtcUpdate`.
+
+CREATE branch: no preserve path (new event always carries explicit picker value). Computes `allDayAlertInstantUtcCreate` from `reminderLeadMinutes / 1440` when allDay.
+
+## sync.ts Derivation Rule
+
+```typescript
+import { classifyValarms } from './vevent.js';
+const alarmClass = classifyValarms(obj.data as string);
+const reminderLeadMinutesValue: number | null =
+  alarmClass.kind === 'preset' || alarmClass.kind === 'offlist'
+    ? alarmClass.leadMinutes
+    : null;
+```
+
+Written to both `.values({...})` and `.onDuplicateKeyUpdate({ set: {...} })`. Classification rules:
+- `preset` or `offlist` → `leadMinutes` (scheduler ground truth)
+- `custom` (absolute DATE-TIME or multiple VALARMs) → `null` (D-07/NOTIF-05)
+- `none` → `null` (no VALARM)
+
+No schema DDL change — `reminder_lead_minutes` column was added by Phase 10 migration.
+
+## CalendarOccurrence Propagation (D-10)
+
+```typescript
+// CalendarOccurrence interface:
+reminderLeadMinutes: number | null;  // after hasRrule
+```
+
+Derived once per VEVENT in `expandOccurrences` via `classifyValarms(rawVevent)` (series-level, D-10). All occurrences inherit the master's value. Added to both non-recurring and recurring occurrence construction branches. GET `/api/events` select also includes `calendarEvents.reminderLeadMinutes` for edit-mode pre-population.
+
+## Verification Results
+
+- `pnpm --filter @familysync/api exec vitest run tests/broker/ tests/broker/vevent.test.ts`: **132/132 PASS**
+- `pnpm --filter @familysync/api exec tsc --noEmit`: **CLEAN (0 errors)**
+- No `drizzle-kit push` introduced; no schema.ts DDL change
+- 13 new tests added: 4 (Task 1 outboxWorker), 5 (Task 2 sync), 4 (Task 3 expand)
+
+## Deviations from Plan
+
+None — plan executed exactly as written.
+
+## Known Stubs
+
+None. All wiring is complete end-to-end. No placeholder values or TODO markers.
+
+## Threat Flags
+
+No new threat surface. All new fields are bounded integers validated by Zod at both ingress (eventFieldsSchema) and drain (outboxPayloadSchema) — T-11-06 mitigated. `classifyValarms` is try/catch safe — T-11-07 mitigated. The VALARM preserve path (`extractValarms`) rides the existing CR-02 scoped query on the writing member's calendar — T-11-08 unchanged.
+
+## Self-Check: PASSED
+
+Files exist:
+- FOUND: apps/api/src/routes/events.ts
+- FOUND: apps/api/src/broker/outboxWorker.ts
+- FOUND: apps/api/src/broker/sync.ts
+- FOUND: apps/api/src/broker/expand.ts
+- FOUND: apps/api/tests/broker/outboxWorker.test.ts
+- FOUND: apps/api/tests/broker/sync.test.ts
+- FOUND: apps/api/tests/broker/expand.test.ts
+
+Commits exist:
+- 79f6871: test(11-03) RED Task 1
+- 4f42b75: feat(11-03) GREEN Task 1
+- cdca930: test(11-03) RED Task 2
+- 1cc0d72: feat(11-03) GREEN Task 2
+- 7df11d2: test(11-03) RED Task 3
+- e171431: feat(11-03) GREEN Task 3
+
+Key exports verified:
+- reminderLeadMinutes in eventFieldsSchema: CONFIRMED (grep: `reminderLeadMinutes: z.number()`)
+- hasExplicitReminder in outboxWorker.ts: CONFIRMED
+- reminderLeadMinutes on CalendarOccurrence: CONFIRMED
+- classifyValarms import in sync.ts: CONFIRMED
+- classifyValarms import in expand.ts: CONFIRMED