---
phase: quick-260610-hbu
verified: 2026-06-10T12:39:30Z
status: passed
score: 5/5 must-haves verified
overrides_applied: 0
---

# Quick Task 260610-hbu: Reminder Scheduler Resilience Verification Report

**Task Goal:** Make the Phase 5 reminder scheduler resilient to missed/late cron ticks — catch-up scan + per-uid exactly-once dedup
**Verified:** 2026-06-10T12:39:30Z
**Status:** passed
**Re-verification:** No — initial verification

---

## Goal Achievement

### Observable Truths

| #   | Truth                                                                                                                                                                                                                                      | Status   | Evidence                                                                                                                                                                                                          |
| --- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | -------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| 1   | A shared timed event in (now, now+16min] fires on the next scan even after a missed/late tick (catch-up).                                                                                                                                  | VERIFIED | `gt(calendarEvents.dtstartUtc, now)` at line 103; lower bound is `now`, not `now+14min`. Any scan while event is still future will find it. MISSED-TICK-RECOVERY test fires at 8-min lead.                        |
| 2   | A given event fires EXACTLY ONCE across all scans while in the catch-up window — no cross-tick double-fire.                                                                                                                                | VERIFIED | `sentReminders` is `Map<string, number>` keyed on bare uid (line 47); `if (sentReminders.has(uid)) continue` at line 145. SINGLE-FIRE test asserts `dispatchPush` called exactly once across 3 consecutive ticks. |
| 3   | An event whose dtstart has already passed (dtstart <= now) does NOT trigger a reminder.                                                                                                                                                    | VERIFIED | `gt(calendarEvents.dtstartUtc, now)` at line 103 excludes already-started events at the DB level. "already-started" test mocks empty rows, asserts 0 dispatches.                                                  |
| 4   | Notification body reflects actual lead time (e.g. "Starts in 8 min"), guarded to minimum 1.                                                                                                                                                | VERIFIED | Line 150: `const minutes = Math.max(1, Math.round((event.dtstartUtc.getTime() - now.getTime()) / 60000))` then `body: \`Starts in ${minutes} min\`` at line 156. Not hardcoded.                                   |
| 5   | Existing Phase-5 behaviours stay green: isShared-only (D-05), allDay excluded (D-07), always-visible notification (D-11), empty push_subscriptions -> zero sends/no crash (D-16), per-event and per-sub error isolation (T-05-18/T-05-19). | VERIFIED | All present in source (lines 101-102 for D-05/D-07; line 98 for D-11 via dispatchPush; lines 141-186 for T-05-18/19 try/catch isolation). Tests for D-05, D-07, D-16, T-05-19 all pass (10/10).                   |

**Score:** 5/5 truths verified

---

### Required Artifacts

| Artifact                                          | Expected                                                                                                      | Status   | Details                                                                                                                             |
| ------------------------------------------------- | ------------------------------------------------------------------------------------------------------------- | -------- | ----------------------------------------------------------------------------------------------------------------------------------- |
| `apps/api/src/broker/reminderScheduler.ts`        | Resilient catch-up scan with per-uid exactly-once dedup, `runReminderCheck` exported                          | VERIFIED | 213 lines; contains `runReminderCheck`, `startReminderScheduler`; `Map<string, number>` dedup; `gt` lower bound; lead-accurate body |
| `apps/api/tests/broker/reminderScheduler.test.ts` | Tests covering single-fire, missed-tick recovery, already-started exclusion, plus retained Phase-5 behaviours | VERIFIED | 409 lines; contains "SINGLE-FIRE", "MISSED-TICK-RECOVERY", "already-started", D-05/D-07/D-16/WR-01/CR-01/T-05-19 tests              |

---

### Key Link Verification

| From                   | To                          | Via                                          | Status   | Details                                                                                                                                                        |
| ---------------------- | --------------------------- | -------------------------------------------- | -------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `reminderScheduler.ts` | `calendarEvents.dtstartUtc` | `WHERE gt(now) AND lte(now+16min)`           | VERIFIED | Line 103: `gt(calendarEvents.dtstartUtc, now)`. Line 104: `lte(calendarEvents.dtstartUtc, windowEnd)`.                                                         |
| `reminderScheduler.ts` | `dispatchPush`              | fan-out per subscription, then mark uid sent | VERIFIED | Lines 163-174: per-sub loop calling `await dispatchPush(sub, notification)`. Line 179: `sentReminders.set(uid, ...)` after the fan-out loop (WR-01 preserved). |

---

### Behavioral Spot-Checks

| Behavior                                          | Command                                                                                | Result                                               | Status |
| ------------------------------------------------- | -------------------------------------------------------------------------------------- | ---------------------------------------------------- | ------ |
| TypeScript compilation (strict)                   | `pnpm --filter @familysync/api typecheck`                                              | exit 0, no output                                    | PASS   |
| All 10 reminderScheduler tests pass               | `pnpm --filter @familysync/api exec vitest run tests/broker/reminderScheduler.test.ts` | 1 file passed, 10/10 tests passed                    | PASS   |
| `gt(dtstartUtc, now)` lower bound present         | `grep -n "gt(" reminderScheduler.ts`                                                   | line 103: `gt(calendarEvents.dtstartUtc, now)`       | PASS   |
| `gte` import/usage removed                        | `grep -n "gte" reminderScheduler.ts`                                                   | no matches                                           | PASS   |
| `minuteBucket` variable fully removed             | `grep -n "minuteBucket" reminderScheduler.ts`                                          | only in comments, no variable                        | PASS   |
| Dedup store is `Map<string, number>` keyed by uid | `grep -n "Map" reminderScheduler.ts`                                                   | line 47: `new Map<string, number>()`                 | PASS   |
| Lead-accurate body with Math.max guard            | `grep -n "Math.max" reminderScheduler.ts`                                              | line 150: `Math.max(1, Math.round(...))`             | PASS   |
| WR-01 mark-after-dispatch preserved               | `grep -n "sentReminders.set" reminderScheduler.ts`                                     | line 179: after fan-out loop                         | PASS   |
| CR-01 started-event pruning                       | `grep -n "dtstartMs" reminderScheduler.ts`                                             | lines 192-194: prune on `dtstartMs <= now.getTime()` | PASS   |
| Required test names present                       | grep for SINGLE-FIRE, MISSED, already-started in test file                             | all found at lines 178, 214, 119                     | PASS   |

---

### Anti-Patterns Found

None. No TBD/FIXME/XXX markers in modified files. No hardcoded empty data. No stubs.

The two `minuteBucket` occurrences at lines 42 and 142 of `reminderScheduler.ts` are comment text only (no variable), correctly documenting the old scheme for historical context — not a stub indicator.

---

### Human Verification Required

None. All must-haves are verifiable programmatically and confirmed by running commands.

---

## Gaps Summary

No gaps. All 5 must-have truths are VERIFIED against the actual codebase:

- Catch-up window implemented: `gt(dtstartUtc, now)` lower bound (not `gte(now+14min)`) confirmed in source and tested.
- Per-uid exactly-once dedup: `Map<string, number>` keyed on bare uid confirmed; `minuteBucket` variable fully absent.
- Already-started exclusion: strict `gt` lower bound confirmed; test coverage present.
- Lead-accurate body: `Math.max(1, Math.round(...))` formula confirmed in source.
- Phase-5 decisions preserved: D-05/D-07/D-11/D-12/D-16/T-05-18/T-05-19/WR-01/CR-01 all present in source and tested.
- Typecheck: exit 0.
- Test suite: 10/10 passing, including the three required new tests (SINGLE-FIRE, MISSED-TICK-RECOVERY, already-started exclusion).

---

_Verified: 2026-06-10T12:39:30Z_
_Verifier: Claude (gsd-verifier)_
