docs(15): complete Phase 15 - Real-time Synchronization
Phase 15 verified and complete with bug fixes: - WebSocket handler extracts attachment fields correctly - Deduplication works for both WebSocket and REST API paths - Integration tests created (test/attachments/real-time-sync.spec.ts) - Human verification passed Bug fixes applied during UAT: - Optimistic update for uploader (sender excluded from WebSocket) - fetchChatHistory dispatch on channel activation - API field name (chats not messages) - API parameter name (music_session not session_id) - Infinite loop prevention in fetch Known limitation documented: - WebSocket only broadcasts to musicians (as_musician: true filter) - Pre-existing backend behavior, not introduced by v1.2 Requirements satisfied: REQ-3.1*, REQ-3.2 * REQ-3.1 has known limitation for non-musician participants Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Nuwan
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@ -480,8 +480,8 @@ The following are explicitly **NOT** requirements for v1.2:
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| REQ-2.3 | Phase 14 | Complete |
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| REQ-2.4 | Phase 14 | Complete |
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| REQ-2.5 | Phase 14 | Complete |
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| REQ-3.1 | Phase 15 | Pending |
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| REQ-3.2 | Phase 15 | Pending |
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| REQ-3.1 | Phase 15 | Complete* |
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| REQ-3.2 | Phase 15 | Complete |
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| REQ-4.1 | Phase 14 | Complete |
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| REQ-4.2 | Phase 14 | Complete |
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| REQ-5.1 | Phase 16 | Pending |
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@ -279,7 +279,7 @@ Plans:
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6. User joining session after upload sees attachment in chat history
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Plans:
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- [ ] 15-01-PLAN.md — Verify real-time sync and create integration tests
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- [x] 15-01-PLAN.md — Verify real-time sync and create integration tests
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#### Phase 16: Attachment Finalization
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**Goal**: Complete attachment feature with comprehensive error handling, edge cases, and UAT validation
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@ -322,5 +322,5 @@ Phases execute in numeric order: 1 → 2 → 3 → 4 → 5 → 6 → 7 → 8 →
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| 12. Attachment Research & Backend Validation | v1.2 | 2/2 | Complete | 2026-02-02 |
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| 13. File Upload Infrastructure | v1.2 | 3/3 | Complete | 2026-02-05 |
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| 14. Chat Integration & Display | v1.2 | 3/3 | Complete | 2026-02-06 |
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| 15. Real-time Synchronization | v1.2 | 0/1 | Not started | - |
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| 15. Real-time Synchronization | v1.2 | 1/1 | Complete | 2026-02-06 |
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| 16. Attachment Finalization | v1.2 | 0/2 | Not started | - |
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@ -9,12 +9,12 @@ See: .planning/PROJECT.md (updated 2026-02-02)
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## Current Position
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Phase: 14 of 16 (Chat Integration and Display)
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Plan: 3 of 3 (Complete)
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Status: Phase 14 COMPLETE — Gap closed: REST API attachment transformation
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Last activity: 2026-02-05 — Completed 14-03-PLAN.md (Gap closure: REST API attachment transformation)
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Phase: 15 of 16 (Real-time Synchronization)
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Plan: 1 of 1 (Complete)
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Status: Phase 15 COMPLETE — Real-time sync verified, bug fixes applied
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Last activity: 2026-02-06 — Completed 15-01-PLAN.md (Verification + bug fixes)
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Progress: ████████░░░░ 80% (v1.2 MILESTONE - 8/10 plans complete)
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Progress: █████████░░░ 90% (v1.2 MILESTONE - 9/10 plans complete)
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## Performance Metrics
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@ -424,6 +424,16 @@ Recent decisions affecting current work:
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- Flex layout pattern: minWidth: 0 on flex parent required for text-overflow: ellipsis to work
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- Phase 14 COMPLETE: All attachment display and interaction features delivered
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**From Phase 15 Plan 1 (15-real-time-synchronization):**
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- WebSocket handler verified: extracts attachmentId, attachmentName, attachmentType, purpose, attachmentSize
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- Deduplication confirmed: both WebSocket and REST API paths use message.id for deduplication
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- Backend excludes sender from WebSocket broadcast (server_publish_to_session uses exclude_client_id)
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- Optimistic update added for uploader: constructs message from MusicNotation response + user info
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- Chat history fetch fixed: was never being called, now dispatches on channel activation
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- API parameter name fixed: backend expects `music_session` not `session_id`
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- API response field fixed: backend returns `chats` not `messages`
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- Known limitation: WebSocket only broadcasts to musicians (as_musician: true filter)
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### Deferred Issues
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**From Phase 3 Plan 3 UAT:**
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@ -443,6 +453,14 @@ Recent decisions affecting current work:
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- Root cause: Mixer system not available without Redux state
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- Needs: Architecture refactor or document as modal-only feature
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4. **WebSocket chat messages only broadcast to musicians** (Medium)
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- Backend's `server_publish_to_session` uses `as_musician: true` filter
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- Root cause: `mq_router.rb` line 42 filters recipients to musicians only
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- Impact: Listeners/fans without audio tracks don't receive real-time WebSocket messages
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- Workaround: Messages visible after page refresh (REST API doesn't have this filter)
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- Fix: Change `chat_message.rb` to use `server_publish_to_everyone_in_session`
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- Blocker: Backend changes out of scope for v1.2
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### Roadmap Evolution
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- **v1.0 Media Players** (Phases 1-5): Completed 2026-01-14 - Backing Track and JamTrack modernization
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@ -461,14 +479,12 @@ Recent decisions affecting current work:
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## Session Continuity
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Last session: 2026-02-05T20:23:10Z
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Stopped at: Completed 14-03-PLAN.md (Gap closure: REST API attachment transformation)
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Last session: 2026-02-06T12:00:00Z
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Stopped at: Completed 15-01-PLAN.md (Real-time sync verification + bug fixes)
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Resume file: None
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**Status:** Phase 14 COMPLETE — Gap closed: Attachments now display correctly via both WebSocket and REST API paths
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**Status:** Phase 15 COMPLETE — Real-time sync verified, multiple bug fixes applied
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**Next steps:**
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1. Start Phase 15: Attachment Metadata & Display
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2. Continue with Phase 16: File Access Control & Security
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3. Ensure WebSocket and REST API paths both deliver attachments correctly
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4. Validate chat history includes attachments on join
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5. mp3 format support decision still pending (frontend allows, backend doesn't support yet)
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1. Start Phase 16: Attachment Finalization (error handling, edge cases, UAT)
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2. mp3 format support decision still pending (frontend allows, backend doesn't support yet)
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3. Known limitation: WebSocket only broadcasts to musicians (backend `as_musician: true` filter)
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@ -0,0 +1,108 @@
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---
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phase: 15-real-time-synchronization
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plan: 01
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status: complete
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started: 2026-02-06
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completed: 2026-02-06
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duration: ~45 min (including bug fixes from UAT)
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commits:
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- 86206e199: "feat(15): verify WebSocket handler and clean debug logs"
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- e9dd992e2: "test(15): create real-time sync integration tests"
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- bfee9acdf: "fix(15): resolve UAT issues - uploader message visibility and chat history"
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- da4e864ab: "fix(15): correct API response field name (chats not messages)"
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- 5df60ad6c: "fix(15): pass sessionId to fetchChatHistory for session messages"
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- fce74152f: "fix(15): prevent infinite loop in chat history fetch"
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- e24c65590: "fix(15): use correct parameter name for chat API (music_session)"
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---
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# Plan 15-01 Summary: Real-time Sync Verification
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## Objective
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Verify and test real-time attachment synchronization across session participants.
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## Completed Tasks
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### Task 1: Verify WebSocket Handler Implementation ✓
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- Verified handleChatMessage extracts all attachment fields correctly
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- Cleaned up debug console.log statements from JKSessionScreen.js
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- Confirmed sessionId is added from currentSession.id
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### Task 2: Verify Deduplication Logic ✓
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- Confirmed addMessageFromWebSocket uses `message.id` for deduplication
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- Confirmed fetchChatHistory.fulfilled also deduplicates by id
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- Both paths (WebSocket + REST API) use consistent deduplication
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### Task 3: Create Real-time Sync Integration Tests ✓
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- Created `test/attachments/real-time-sync.spec.ts` (215 lines)
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- Tests cover: WebSocket message receipt, deduplication, chat history integration
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- Uses Redux dispatch to simulate WebSocket messages
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### Task 4: Human Verification ✓
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- Multi-user testing performed with two browsers
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- Identified and fixed multiple bugs during UAT
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## Bug Fixes During UAT
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### Issue 1 & 2: Uploader doesn't see their own attachment
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**Root cause:** Backend's `server_publish_to_session` excludes sender via `exclude_client_id`
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**Fix:** Added optimistic message in `uploadAttachment.fulfilled` for the uploader
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### Issue 3: No messages after page reload
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**Root cause:** `fetchChatHistory` was imported but never called
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**Fix:** Added useEffect in JKChatMessageList to dispatch fetchChatHistory
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### Issue 4: TypeError on chat window open
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**Root cause:** API returns `{ chats: [...] }` but code expected `{ messages: [...] }`
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**Fix:** Changed to extract `chats` field from API response
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### Issue 5: Infinite loop when fetching chat
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**Root cause:** Condition allowed retry on 'failed' status
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**Fix:** Changed to only fetch when status is 'idle'
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### Issue 6: "Failed to load message history"
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**Root cause:** Backend expects `music_session` param, we sent `session_id`
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**Fix:** Changed getChatMessages to use `music_session` parameter
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## Known Limitation
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**WebSocket only broadcasts to musicians:**
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- Backend's `server_publish_to_session` uses `as_musician: true` filter
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- Users without audio tracks (listeners/fans) don't receive real-time messages
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- Workaround: Messages visible after page refresh via REST API
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- This is a pre-existing backend limitation, not introduced by our changes
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- Fix would require backend change (out of scope for v1.2)
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## Files Modified
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- `jam-ui/src/components/client/JKSessionScreen.js` - Cleaned debug logs, added user info to upload
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- `jam-ui/src/components/client/chat/JKChatMessageList.js` - Added fetchChatHistory dispatch
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- `jam-ui/src/store/features/sessionChatSlice.js` - Fixed API field name, added optimistic upload message
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- `jam-ui/src/helpers/rest.js` - Fixed API parameter name (music_session)
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- `jam-ui/src/store/features/__tests__/sessionChatSlice.test.js` - Updated test payloads
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- `jam-ui/test/attachments/real-time-sync.spec.ts` - New integration tests
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## Verification Results
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| Test | Result |
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|------|--------|
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| Uploader sees own attachment | ✓ Pass (via optimistic update) |
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| Other participants see attachment in real-time | ✓ Pass (for musicians) |
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| No duplicate messages | ✓ Pass |
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| Messages persist after page refresh | ✓ Pass |
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| Attachments in chat history on join | ✓ Pass |
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## Phase 15 Success Criteria
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- [x] WebSocket handler verified and debug logs cleaned
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- [x] Deduplication logic verified for both message paths
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- [x] Integration tests created and checked in
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- [x] Human verification confirms multi-user real-time sync works
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- [x] No duplicate messages for any user
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- [x] Attachments persist in chat history
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## Next Steps
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Phase 16: Attachment Finalization
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- Error handling and edge case validation
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- UAT and final integration testing
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