docs(phase-07): complete phase execution
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gsd_state_version: 1.0
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milestone: v1.0
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milestone_name: milestone
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status: in-progress
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last_updated: "2026-03-05T01:58:48Z"
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status: completed
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last_updated: "2026-03-05T02:04:09.789Z"
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progress:
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total_phases: 8
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total_phases: 7
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completed_phases: 7
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total_plans: 13
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completed_plans: 13
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@@ -23,7 +23,7 @@ progress:
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**Phase:** 07-backend-performance (complete)
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**Plan:** 2/2 (all complete)
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**Status:** Phase 7 complete
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**Status:** Milestone complete
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```
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Phase Progress: [#######.] 7/8 phases — Phase 7: 2/2 plans complete ✓
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---
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phase: 07-backend-performance
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verified: 2026-03-04T22:45:00Z
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status: passed
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score: 9/9 must-haves verified
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---
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# Phase 7: Backend Performance Verification Report
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**Phase Goal:** Queue mutations and library loading are fast — single-track queue changes are O(1) instead of O(n), and the library doesn't block startup with a full data fetch
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**Verified:** 2026-03-04T22:45:00Z
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**Status:** passed
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**Re-verification:** No — initial verification
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## Goal Achievement
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### Observable Truths
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| # | Truth | Status | Evidence |
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|---|-------|--------|----------|
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| 1 | AddTrack persists a single INSERT + position shift instead of DELETE ALL + batch INSERT | ✓ VERIFIED | `AddTrack` calls `q.persistAddTrack(track)` (queue.go:368) which does a single `InsertQueueTrack` (persistence.go:17-23). No `commitMutation` or `persistTracks` call. |
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| 2 | RemoveTrack persists a single DELETE + position shift instead of DELETE ALL + batch INSERT | ✓ VERIFIED | `RemoveTrack` calls `q.persistRemoveTrack(position)` (queue.go:774) which does `RemoveQueueTrackByPosition` + `ShiftQueuePositionsDown` in a transaction (persistence.go:146-192). No `commitMutation` or `persistTracks` call. |
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| 3 | InsertNext/InsertNextTracks/InsertTracksAt persist incremental INSERTs + position shift instead of DELETE ALL + batch INSERT | ✓ VERIFIED | `InsertNext` calls `q.persistInsertTracks([]Track{track}, insertPos)` (queue.go:526), `InsertNextTracks` calls `q.persistInsertTracks(newTracks, insertPos)` (queue.go:476), `InsertTracksAt` calls `q.persistInsertTracks(newTracks, index)` (queue.go:593). `persistInsertTracks` does variable-N position shift + batch INSERT in a transaction (persistence.go:81-141). |
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| 4 | SetQueue Phase 2 skips file paths already resolved in Phase 1 | ✓ VERIFIED | `resolveRemainingTracks` accepts `phase1Meta map[string]trackMeta` (queue.go:267), filters `unresolvedPaths` by excluding keys in `phase1Meta` (queue.go:270-276), calls `lookupTrackMetaBatch(unresolvedPaths)` only for unresolved paths (queue.go:279), then merges Phase 1 results back in (queue.go:282-284). |
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| 5 | Bulk operations (SetQueue, Clear, MoveQueueTracks) still use the full DELETE ALL + batch INSERT pattern | ✓ VERIFIED | `resolveRemainingTracks` calls `q.commitMutation(false)` (queue.go:330), `MoveQueueTracks` calls `q.commitMutation(true)` (queue.go:737), `Clear` calls `q.commitMutation(false)` (queue.go:1102), `RemoveTracks` calls `q.persistTracks()` (queue.go:849). All bulk paths preserved. |
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| 6 | All existing queue persistence roundtrip tests pass | ✓ VERIFIED | `go test ./queue/... -race -count=1` passes all 29 tests including persistence roundtrip tests (TestSaveState_RestoreState_Roundtrip, TestSaveState_RestoreState_EmptyQueue, etc.) |
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| 7 | LibraryStore constructor does NOT call eagerFetch() — app shell renders instantly | ✓ VERIFIED | Constructor calls `this.deferEagerFetch()` (library-store.ts:56) instead of `this.eagerFetch()` directly. No direct `eagerFetch()` call in constructor. |
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| 8 | After DOM is ready, eagerFetch() is called — all 4 data types still loaded eagerly | ✓ VERIFIED | `deferEagerFetch()` listens for `DOMContentLoaded` event (library-store.ts:70-76) or calls immediately if DOM already parsed (library-store.ts:80). `eagerFetch()` still calls all 4 getters: `getTracks`, `getAlbums`, `getArtists`, `getGenres` (library-store.ts:325-330). |
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| 9 | Post-scan invalidation still calls eagerFetch() to re-fetch everything | ✓ VERIFIED | `invalidate()` method calls `this.eagerFetch()` directly (library-store.ts:315), not deferred. Scan complete event listener calls `this.invalidate()` (library-store.ts:51-53). |
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**Score:** 9/9 truths verified
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### Required Artifacts
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| Artifact | Expected | Status | Details |
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|----------|----------|--------|---------|
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| `backend/queue/persistence.go` | Incremental persist helpers: persistAddTrack, persistAddTracks, persistInsertTracks, persistRemoveTrack | ✓ VERIFIED | All 4 helpers present (lines 16, 30, 81, 146). Contains `func (q *Queue) persistAddTrack` as required. 475 lines, substantive implementations with transactions, error handling, and SAFETY comments. |
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| `backend/queue/queue.go` | Updated mutations using incremental persistence; resolveRemainingTracks with exclusion set | ✓ VERIFIED | AddTrack (line 368), AddTracks (line 418), InsertNext (line 526), InsertNextTracks (line 476), InsertTracksAt (line 593), RemoveTrack (line 774) all use incremental persist. resolveRemainingTracks accepts `phase1Meta` and filters with exclusion set (lines 267-284). Contains `persistAddTrack` as required. |
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| `frontend/src/store/library-store.ts` | Deferred eagerFetch via DOMContentLoaded event | ✓ VERIFIED | Contains `deferEagerFetch()` method with `DOMContentLoaded` listener (line 68-82). Constructor calls `deferEagerFetch()` (line 56) instead of `eagerFetch()`. Contains `EventsOn` as required. |
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### Key Link Verification
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| From | To | Via | Status | Details |
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|------|----|-----|--------|---------|
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| queue.go AddTrack | persistence.go persistAddTrack | direct method call | ✓ WIRED | `q.persistAddTrack(track)` at queue.go:368, replaces commitMutation |
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| queue.go RemoveTrack | persistence.go persistRemoveTrack | direct method call | ✓ WIRED | `q.persistRemoveTrack(position)` at queue.go:774, replaces commitMutation |
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| queue.go resolveRemainingTracks | queue.go lookupTrackMetaBatch | exclusion set filtering | ✓ WIRED | `phase1Meta` parameter (queue.go:267), exclusion filter (queue.go:270-276), `lookupTrackMetaBatch(unresolvedPaths)` (queue.go:279) |
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| library-store.ts constructor | library-store.ts eagerFetch | DOMContentLoaded event | ✓ WIRED | `this.deferEagerFetch()` (line 56) → `DOMContentLoaded` listener → `this.eagerFetch()` (lines 68-82) |
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### Requirements Coverage
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| Requirement | Source Plan | Description | Status | Evidence |
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|-------------|------------|-------------|--------|----------|
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| PERF-01 | 07-01-PLAN | Queue single-track mutations use incremental INSERT/DELETE instead of full table rewrite | ✓ SATISFIED | AddTrack→persistAddTrack, RemoveTrack→persistRemoveTrack, InsertNext/InsertNextTracks/InsertTracksAt→persistInsertTracks. No commitMutation/persistTracks for single-track ops. |
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| PERF-02 | 07-01-PLAN | SetQueue Phase 2 skips file paths already resolved in Phase 1 | ✓ SATISFIED | resolveRemainingTracks filters unresolvedPaths via phase1Meta exclusion set, calls lookupTrackMetaBatch only for unresolved paths, merges Phase 1 results back. |
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| PERF-03 | 07-02-PLAN | Library store constructor no longer calls eagerFetch(); data loads after DOM ready | ✓ SATISFIED | Constructor calls deferEagerFetch() which uses DOMContentLoaded event. eagerFetch() loads all 4 data types eagerly once triggered. invalidate() still calls eagerFetch() directly. |
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No orphaned requirements — all 3 requirements (PERF-01, PERF-02, PERF-03) from REQUIREMENTS.md traceability table for Phase 7 are accounted for by plans 07-01 and 07-02.
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### Anti-Patterns Found
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| File | Line | Pattern | Severity | Impact |
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|------|------|---------|----------|--------|
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| — | — | No TODO/FIXME/PLACEHOLDER found | — | — |
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| — | — | No empty implementations found | — | — |
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| — | — | No stub patterns found | — | — |
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Clean — no anti-patterns detected in any modified files.
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### Human Verification Required
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#### 1. App Shell Renders Before Data Loads
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**Test:** Launch the app and observe whether the UI shell appears before library data populates the views
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**Expected:** App shell (sidebar, toolbar, empty views) renders immediately; then tracks/albums/artists/genres populate after a brief delay
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**Why human:** Visual render timing cannot be verified programmatically — requires observing paint order
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#### 2. Queue Operations Feel Fast on Large Queues
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**Test:** Build a queue with 500+ tracks, then add/remove individual tracks
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**Expected:** Single-track add/remove completes noticeably faster than before (no perceptible delay from full table rewrite)
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**Why human:** Performance improvement is a feel/perception check, not a binary pass/fail
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#### 3. Post-Scan Library Refresh Still Works
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**Test:** Trigger a library scan while the app is running, then verify all views refresh with new data
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**Expected:** After scan completes, all 4 views (tracks, albums, artists, genres) show updated data
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**Why human:** End-to-end behavior involving backend scan + event emission + frontend refresh cycle
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### Gaps Summary
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No gaps found. All 9 observable truths verified, all 3 artifacts substantive and wired, all 4 key links connected, all 3 requirements satisfied. Backend builds, all 29 queue tests pass with `-race`, and all 3 commits exist in git history.
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---
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_Verified: 2026-03-04T22:45:00Z_
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_Verifier: Claude (gsd-verifier)_
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