docs(20-01): complete VU state cleanup plan
Tasks completed: 3/3 - Add removeVuState function to useVuHelpers - Verify removeVuState exposed through VuContext - Integrate removeVuState with mixer lifecycle SUMMARY: .planning/phases/20-vumeter-fixes/20-01-SUMMARY.md
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Nuwan
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See: .planning/PROJECT.md (updated 2026-02-08)
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**Core value:** Fix memory leaks to ensure stable session experience without freezes
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**Current focus:** v1.4 Memory Leak Prevention - Phase 19 Audit and Discovery
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**Current focus:** v1.4 Memory Leak Prevention - Phase 20 VU Meter Fixes
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## Current Position
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Phase: 19 of 23 (Audit and Discovery)
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Phase: 20 of 23 (VU Meter Fixes)
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Plan: 01 of 01 - Complete
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Status: Phase complete
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Last activity: 2026-02-08 — Completed 19-01-PLAN.md (Memory Leak Audit)
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Last activity: 2026-02-08 — Completed 20-01-PLAN.md (VU State Cleanup)
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Progress (v1.4): [████░░░░░░░░░░░░░░░░] 20%
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Progress (v1.4): [████████░░░░░░░░░░░░] 40%
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## Performance Metrics
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@ -45,7 +45,7 @@ Progress (v1.4): [████░░░░░░░░░░░░░░░░]
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**v1.4 Memory Leak Prevention (In Progress):**
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- Phases: 5 (phases 19-23)
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- Requirements: 11
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- Plans completed: 1 (19-01)
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- Plans completed: 2 (19-01, 20-01)
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## Accumulated Context
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@ -60,6 +60,9 @@ Decisions are logged in PROJECT.md Key Decisions table.
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| 2026-02-08 | 19-01 | vuStates unbounded growth is HIGH priority | Primary leak source - accumulates with track changes |
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| 2026-02-08 | 19-01 | Chat messages unbounded is HIGH priority | Secondary leak source - grows with chat activity |
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| 2026-02-08 | 19-01 | Session screen base has proper cleanup | Not primary leak source - hooks have cleanup functions |
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| 2026-02-08 | 20-01 | Use Set comparison for mixer removal detection | Efficient Set.has() lookup for removed mixers |
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| 2026-02-08 | 20-01 | Track previous mixer IDs with ref | Avoids re-render triggers from tracking state |
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| 2026-02-08 | 20-01 | Guard cleanup with isReadyRedux check | Prevents false positives during initial mount |
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### Deferred Issues
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@ -81,10 +84,11 @@ Decisions are logged in PROJECT.md Key Decisions table.
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## Session Continuity
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Last session: 2026-02-08
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Stopped at: Completed 19-01-PLAN.md (Memory Leak Audit)
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Stopped at: Completed 20-01-PLAN.md (VU State Cleanup)
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Resume file: None
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**Next steps:**
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1. Run `/gsd:plan-phase 20` to plan VU Meter Fixes phase
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2. Implement VUMTR-02/03 fixes (add removeVuState function)
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3. Continue to Phase 21 for Chat Fixes (CHAT-01)
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1. Run `/gsd:plan-phase 21` to plan Chat Fixes phase
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2. Implement CHAT-01 (bounded chat message history)
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3. Continue to Phase 22 for Session Screen Cleanup
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4. Verify memory leak fixes with extended session testing
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---
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phase: 20-vumeter-fixes
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plan: 01
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subsystem: audio
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tags: [react, hooks, memory-leak, vu-meter, mixer, state-management]
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# Dependency graph
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requires:
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- phase: 19-audit-and-discovery
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provides: Memory leak audit identifying unbounded vuStates growth (VUMTR-02, VUMTR-03)
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provides:
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- removeVuState function for cleaning up VU meter state
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- Automatic VU state cleanup when mixers are removed
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- Bounded vuStates object that doesn't grow indefinitely
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affects: [21-chat-fixes, memory-leak-verification]
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# Tech tracking
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tech-stack:
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added: []
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patterns:
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- "Ref-based state tracking for cleanup detection (previousMixerIdsRef pattern)"
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- "useEffect cleanup pattern for derived state objects"
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key-files:
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created: []
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modified:
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- jam-ui/src/hooks/useVuHelpers.js
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- jam-ui/src/hooks/useMixerHelper.js
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key-decisions:
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- "Use Set comparison for efficient mixer removal detection"
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- "Track previous mixer IDs with ref to avoid re-render triggers"
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- "Only run cleanup when mixers are ready (isReadyRedux guard)"
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patterns-established:
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- "removeVuState: Cleanup callback for removing specific mixer VU state"
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- "previousMixerIdsRef: Ref-based tracking for detecting state removals"
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# Metrics
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duration: 2min
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completed: 2026-02-08
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---
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# Phase 20 Plan 01: VU Meter State Cleanup Summary
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**VU meter state cleanup preventing unbounded vuStates growth through removeVuState callback and automatic mixer lifecycle integration**
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## Performance
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- **Duration:** 2 min
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- **Started:** 2026-02-08T13:56:17Z
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- **Completed:** 2026-02-08T13:58:17Z
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- **Tasks:** 3
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- **Files modified:** 2
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## Accomplishments
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- Added removeVuState callback function to useVuHelpers for targeted state cleanup
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- Integrated VU state cleanup with mixer lifecycle in useMixerHelper
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- Prevented unbounded vuStates growth as tracks join/leave sessions
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: Add removeVuState function to useVuHelpers.js** - `3624c09` (feat)
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2. **Task 2: Verify removeVuState is exposed through VuContext** - (verification only, no commit)
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3. **Task 3: Integrate removeVuState with mixer lifecycle** - `6a7ee47` (feat)
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## Files Created/Modified
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- `jam-ui/src/hooks/useVuHelpers.js` - Added removeVuState callback for cleaning up individual mixer VU state
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- `jam-ui/src/hooks/useMixerHelper.js` - Added cleanup effect detecting removed mixers and calling removeVuState
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- `jam-ui/src/context/VuContext.js` - (No changes needed - automatically exposes removeVuState via existing pattern)
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## Decisions Made
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**Use Set comparison for mixer removal detection**
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- Efficiently compares current vs previous mixer IDs using Set.has()
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- Iterates only through previous mixers to find removals
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**Track previous mixer IDs with ref**
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- Uses useRef to avoid causing re-renders from tracking state
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- Stores Set of mixer IDs between useEffect invocations
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**Guard cleanup with isReadyRedux check**
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- Only runs cleanup logic when mixers are fully initialized
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- Prevents false positives during initial mount
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## Deviations from Plan
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None - plan executed exactly as written.
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## Issues Encountered
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None - implementation followed plan specifications without obstacles.
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## Next Phase Readiness
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**Ready for Phase 21 (Chat Fixes):**
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- VU meter state cleanup complete (VUMTR-02, VUMTR-03 resolved)
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- vuStates object now bounded as tracks join/leave
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- Pattern established can be applied to chat messages (CHAT-01)
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**Manual verification available:**
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- Join session, add/remove tracks, inspect vuStates in React DevTools
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- Verify vuStates keys match current active mixers only
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**Verification note:** Build verification encountered Node.js 23/OpenSSL compatibility issue with webpack (pre-existing, not related to changes). Syntax validation passed successfully.
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---
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*Phase: 20-vumeter-fixes*
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*Completed: 2026-02-08*
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