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# Implementation Summary

**Session ID**: `phase22-session06-persistence-lifecycle` **Package**: apps/web **Completed**: 2026-07-05 **Duration**: 0.75 hours

***

## Overview

Completed the browser-local persistence lifecycle for the Phase 22 `GameProjection` aggregate. The web store now schedules guarded projection writes only after reducer changes, supports idle and max-latency flushing, flushes on page lifecycle events, exposes a synchronous test flush helper, and clears projection persistence during reset.

***

## Deliverables

### Files Created

| File | Purpose                                   | Lines |
| ---- | ----------------------------------------- | ----- |
| None | This session extended existing app files. | 0     |

### Files Modified

| File                                         | Changes                                                                                                                                                                    |
| -------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `apps/web/src/store/useGameStore.ts`         | Added projection persistence scheduling, guarded write context, timer cleanup, lifecycle flush handlers, test flush export, and reset storage removal.                     |
| `apps/web/tests/gameProjectionStore.test.ts` | Added focused coverage for debounce flush, synchronous flush, max latency, replay and mock write guards, lifecycle flushing, storage failure tolerance, and reset cleanup. |

***

## Technical Decisions

1. **Store-local scheduler**: Kept projection persistence beside the existing replay persistence helpers so scheduling remains close to the event-apply path and avoids a second projection authority.
2. **Guard helper reuse**: Routed persistence eligibility through `shouldPersistGameProjection()` so replay and mock rules stay owned by `gameProjection.ts`.
3. **Idempotent lifecycle listeners**: Installed page lifecycle flush handlers once and proxied them to the latest module flush callback to support tests and hot module reload behavior.

***

## Test Results

| Metric         | Value                              |
| -------------- | ---------------------------------- |
| Focused Tests  | 55                                 |
| Focused Passed | 55                                 |
| Root Tests     | 3203 total, 3202 passed, 1 skipped |
| Typecheck      | PASS                               |
| Biome          | PASS                               |
| Coverage       | Not reported                       |

***

## Lessons Learned

1. Projection persistence tests must explicitly disable mock mode because the default settings keep mock traffic from writing browser storage.
2. Max-latency behavior needs burst coverage that repeatedly resets the idle debounce while preserving a single forced flush window.
3. Reset paths must clear pending timers before removing storage so stale pending projections cannot be written after reset.

***

## Future Considerations

Items for future sessions:

1. Session 07 should add the replay, reconnect, and honesty regression matrix now that guarded local persistence exists.
2. Session 08 should close browser-local erasure inventory coverage and documentation for the persisted projection key.

***

## Session Statistics

* **Tasks**: 18 completed
* **Files Created**: 0
* **Files Modified**: 2 implementation files
* **Tests Added**: 11 focused store tests
* **Blockers**: 0 resolved


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