[EPIC] Complete remaining PWA Phase 3 features (Push Notifications, Analytics, Advanced Caching) #144
Description
🎯 Vision
Complete the remaining PWA Phase 3 features to achieve a production-ready Progressive Web App with push notifications, offline analytics, and optimized caching strategies.
📋 Sub-Issues & Work Plan
Implementation Phases
- Sub-Issue #144.1: Push Notifications Infrastructure #166 Sub-Issue 1: Push Notifications Infrastructure
- Sub-Issue #144.2: Offline Analytics & Telemetry #167 Sub-Issue 2: Offline Analytics & Telemetry
- Sub-Issue #144.3: Advanced Caching Strategies per Feature #168 Sub-Issue 3: Advanced Caching Strategies per Feature
📊 Context
PWA Phase 3 is ~75% complete (after PR #140 merges). Completed features:
- ✅ IndexedDB integration (PR feat: Phase 3.1 - IndexedDB Setup + App Shortcuts (Quick Wins) #88)
- ✅ App shortcuts (PR feat: Phase 3.1 - IndexedDB Setup + App Shortcuts (Quick Wins) #88)
- ✅ Storage quota monitoring (PR feat: Phase 3.1 - IndexedDB Setup + App Shortcuts (Quick Wins) #88)
- ✅ Background Sync API (PR feat: Background Sync API with automatic retry logic (Phase 3) #90)
- ✅ Share Target API with POST + file support (PR feat: Add POST method file sharing support to Share Target API (#101) #140)
Remaining Phase 3 items to complete the PWA advanced features are now tracked as sub-issues above.
🎯 Success Criteria
- ✅ Push notifications working (subscriptions, display, actions)
- ✅ Analytics tracked offline and synced when online
- ✅ Cache hit ratio >80% for returning users
- ✅ App remains fully functional offline
- ✅ Lighthouse PWA score: 100/100
- ✅ All sub-issues (Sub-Issue #144.1: Push Notifications Infrastructure #166, Sub-Issue #144.2: Offline Analytics & Telemetry #167, Sub-Issue #144.3: Advanced Caching Strategies per Feature #168) complete
- ✅ Comprehensive test coverage (≥80%)
- ✅ Documentation complete
📚 Technical Architecture
1. Push Notifications (Sub-Issue #166)
Components:
- Service Worker push event handler
useNotificationPermissionhook- Push subscription management
- Backend VAPID integration
Use Cases:
- New Secret shared with user
- Password expiration reminder
- Security alerts (unusual login)
- Background Sync completion
2. Offline Analytics (Sub-Issue #167)
Components:
- IndexedDB event queue
- Batch upload mechanism
- Web Vitals tracking
- Error tracking (React + Service Worker)
- GDPR-compliant consent management
Metrics:
- Pageviews
- Interactions (button clicks, form submissions)
- Errors (React errors, network failures)
- Performance (LCP, FID, CLS, cache hits)
3. Advanced Caching (Sub-Issue #168)
Strategies:
| Feature | Strategy | TTL | Rationale |
|---|---|---|---|
| Secrets List | NetworkFirst | 5 min | Fresh data preferred |
| Secret Details | StaleWhileRevalidate | 1 hour | Instant load + background refresh |
| Static Assets | CacheFirst | 1 year | Immutable, versioned |
| Images | CacheFirst | 30 days | Rarely change |
| Auth | NetworkOnly | N/A | Never cache credentials |
Features:
- Route-specific caching
- TTL-based expiration
- Cache invalidation on mutations
- Prefetching for likely actions
- Performance monitoring
🔗 Dependencies
Cross-Repository
- Backend VAPID keys (SecPal/api) - for push notifications
- Backend analytics endpoint (SecPal/api) - for telemetry
Internal
- Requires: Phase 3 basics (IndexedDB feat: Phase 3.1 - IndexedDB Setup + App Shortcuts (Quick Wins) #88, Background Sync feat: Background Sync API with automatic retry logic (Phase 3) #90, Share Target feat: Add POST method file sharing support to Share Target API (#101) #140) ✅
- Blocks: Phase 4 (Phase 4: Offline Data Management & Conflict Resolution #68 - Offline Data Management)
- Related: enhancement: Add file upload to backend API for Secret attachments #141, enhancement: Implement IndexedDB storage for offline file queue #142, [EPIC] Client-Side File Encryption for Zero-Knowledge Architecture #143 (file handling enhancements)
- Part of: Epic Epic: Progressive Web App Infrastructure #64 (Progressive Web App Infrastructure)
🚫 Non-Goals (Phase 4)
- Conflict resolution (Phase 4)
- Optimistic UI updates (Phase 4)
- Data versioning/migration (Phase 4)
📝 Implementation Timeline
Sub-Issue #166: Week 1 - Push Notifications
Sub-Issue #167: Week 2 - Offline Analytics
Sub-Issue #168: Week 3 - Advanced Caching
Total Estimated Effort: 3 weeks
Current Progress: 0/3 sub-issues complete
🔗 PR Linking Instructions
Fixes #<sub-issue-number>
Part of: #144Only the LAST PR (Sub-Issue #168) should close this epic:
Fixes #168
Closes #144Type: Epic (Phase 3 Completion)
Priority: Medium
Target Milestone: PWA Phase 3 Complete
Part of: Epic #64 (Progressive Web App Infrastructure)