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Communication Queue System - Roadmap & TODO List 🗺️

Last Updated: October 26, 2025
Status: Phase 1 Complete - Monitoring & Control ✅

📋 Overview​

This document tracks all pending phases, TODOs, and improvements for the Communication Queue System across both backend and frontend applications.

✅ Completed (Phase 1)​

Backend​

  • ✅ API endpoints (9 endpoints)
  • ✅ Service enhancements (5 new methods)
  • ✅ Repository implementation
  • ✅ Controller with Swagger docs
  • ✅ Circular dependency resolution
  • ✅ TypeScript compilation
  • ✅ Zero linting errors

Frontend​

  • ✅ Type definitions
  • ✅ Service layer
  • ✅ Custom hooks (useQueueStats, useQueueJobs)
  • ✅ Stats cards component
  • ✅ Jobs list component
  • ✅ Details modal component
  • ✅ Main dashboard page
  • ✅ Zero linting errors

Documentation​

  • ✅ API documentation
  • ✅ Integration guide
  • ✅ Implementation details
  • ✅ Visual overview
  • ✅ Complete summary
  • ✅ Quick start guide

🚀 Phase 2: Testing & Quality Assurance (Priority: HIGH)​

Backend Tests​

Unit Tests (4-6 hours)​

// apps/backend/src/communication-queue/application/communication-queue.service.spec.ts

TODO: Write tests for:
- [ ] getStats() - Returns correct counts for all statuses
- [ ] getStats() - Calculates oldest pending job correctly
- [ ] findFailed() - Returns only failed jobs
- [ ] findFailed() - Respects limit parameter
- [ ] findFailed() - Orders by creation date descending
- [ ] retryJob() - Resets job to pending status
- [ ] retryJob() - Resets attempts to 0
- [ ] retryJob() - Clears previous errors
- [ ] retryJob() - Throws error if job not found
- [ ] retryJob() - Throws error if status is not failed/cancelled
- [ ] cancelJob() - Updates status to cancelled
- [ ] cancelJob() - Throws error if job not found
- [ ] cancelJob() - Throws error if status is not pending/processing
- [ ] deleteJob() - Removes job from database
- [ ] calculateNextRetry() - Returns correct exponential backoff times
- [ ] processQueue() - Processes pending jobs in priority order
- [ ] processQueue() - Skips past due jobs
- [ ] processQueue() - Handles errors gracefully

Integration Tests (6-8 hours)​

// apps/backend/test/communication-queue.e2e-spec.ts

TODO: Write tests for:
- [ ] GET /stats - Returns queue statistics
- [ ] GET /pending - Lists pending jobs
- [ ] GET /failed - Lists failed jobs
- [ ] GET /:id - Returns specific job details
- [ ] POST /:id/retry - Retries failed job
- [ ] POST /:id/retry - Returns error for non-existent job
- [ ] POST /:id/retry - Returns error for wrong status
- [ ] POST /:id/cancel - Cancels pending job
- [ ] POST /:id/cancel - Returns error for wrong status
- [ ] DELETE /:id - Deletes job
- [ ] GET /by-communication/:id - Returns job history
- [ ] POST /process-now - Triggers manual processing
- [ ] Auth middleware - Requires authentication
- [ ] Business ID validation

Frontend Tests​

Unit Tests (4-6 hours)​

// apps/frontend-pwa/src/hooks/useQueueStats.test.tsx

TODO: Write tests for:
- [ ] Fetches stats on mount
- [ ] Auto-refreshes every 30 seconds
- [ ] Calls API with correct parameters
- [ ] Handles loading state
- [ ] Handles error state
- [ ] Returns correct data structure
// apps/frontend-pwa/src/hooks/useQueueJobs.test.tsx

TODO: Write tests for:
- [ ] Fetches jobs on mount
- [ ] Filters by status correctly
- [ ] Respects limit parameter
- [ ] Handles loading state
- [ ] Handles error state
- [ ] Refetches data correctly
// apps/frontend-pwa/src/services/communicationQueueService.test.ts

TODO: Write tests for:
- [ ] getQueueStats() - Makes correct API call
- [ ] getPendingJobs() - Appends limit query param
- [ ] getFailedJobs() - Makes correct API call
- [ ] retryJob() - Sends POST request
- [ ] cancelJob() - Sends POST request
- [ ] Handles API errors

Component Tests (6-8 hours)​

// apps/frontend-pwa/src/components/queue/QueueStatsCards.test.tsx

TODO: Write tests for:
- [ ] Renders all 6 stat cards
- [ ] Displays loading skeleton
- [ ] Shows alert banner when threshold exceeded
- [ ] Formats numbers correctly
- [ ] Shows oldest pending timestamp
// apps/frontend-pwa/src/components/queue/QueueJobsList.test.tsx

TODO: Write tests for:
- [ ] Renders jobs in table
- [ ] Filter tabs change displayed jobs
- [ ] Action buttons trigger callbacks
- [ ] Displays empty state
- [ ] Shows error messages
- [ ] Mobile view renders cards
// apps/frontend-pwa/src/components/queue/QueueJobDetailsModal.test.tsx

TODO: Write tests for:
- [ ] Opens and closes modal
- [ ] Displays job details
- [ ] Renders JSON payload
- [ ] Shows error messages
- [ ] Formats timestamps correctly

🔐 Phase 3: Security & Permissions (Priority: HIGH)​

Backend​

Permission Guards (4-6 hours)​

// TODO: Create permission decorator
// apps/backend/src/communication-queue/interfaces/guard/permissions.guard.ts

- [ ] Create PermissionsGuard
- [ ] Define permission constants
- [ ] Apply to sensitive endpoints
// TODO: Add permissions to controller
// apps/backend/src/communication-queue/interfaces/communication-queue.controller.ts

- [ ] Add @RequirePermission('queue:view') to GET endpoints
- [ ] Add @RequirePermission('queue:retry') to POST /:id/retry
- [ ] Add @RequirePermission('queue:cancel') to POST /:id/cancel
- [ ] Add @RequirePermission('queue:delete') to DELETE /:id
- [ ] Add @RequirePermission('queue:admin') to POST /process-now

Rate Limiting (2-3 hours)​

// TODO: Add rate limiting
// apps/backend/src/communication-queue/communication-queue.module.ts

- [ ] Import ThrottlerModule
- [ ] Configure rate limits
- [ ] Add @Throttle() decorators to endpoints
- [ ] Set limits: 100 req/min for GET, 20 req/min for POST

Input Validation (2-3 hours)​

// TODO: Add DTOs with validation
// apps/backend/src/communication-queue/interfaces/dtos/queue-query.dto.ts

- [ ] Create QueueQueryDto with limit validation
- [ ] Create QueueActionDto for retry/cancel
- [ ] Add class-validator decorators
- [ ] Validate business IDs
- [ ] Validate job IDs (UUID format)

Audit Logging (3-4 hours)​

// TODO: Log all destructive actions
// apps/backend/src/communication-queue/application/communication-queue.service.ts

- [ ] Log retry actions with user ID
- [ ] Log cancel actions with user ID
- [ ] Log delete actions with user ID
- [ ] Log manual processing triggers
- [ ] Store audit logs in database

Frontend​

Permission Checks (3-4 hours)​

// TODO: Add permission hooks
// apps/frontend-pwa/src/hooks/useQueuePermissions.ts

- [ ] Create useQueuePermissions hook
- [ ] Check 'queue:view' permission
- [ ] Check 'queue:retry' permission
- [ ] Check 'queue:cancel' permission
- [ ] Check 'queue:delete' permission
- [ ] Check 'queue:admin' permission
// TODO: Conditionally render based on permissions
// apps/frontend-pwa/src/components/queue/QueueJobsList.tsx

- [ ] Hide retry button if no permission
- [ ] Hide cancel button if no permission
- [ ] Hide delete action if no permission
- [ ] Disable process now if not admin

📊 Phase 4: Performance & Optimization (Priority: MEDIUM)​

Backend​

Database Optimization (4-6 hours)​

// TODO: Add database indexes
// apps/backend/src/database/migrations/add_queue_indexes.ts

- [ ] Add index on status column
- [ ] Add index on scheduled_at column
- [ ] Add index on created_at column
- [ ] Add composite index on (status, scheduled_at)
- [ ] Add index on communication_id
- [ ] Add foreign key constraints

Caching (3-4 hours)​

// TODO: Add caching for stats
// apps/backend/src/communication-queue/application/communication-queue.service.ts

- [ ] Cache getStats() result for 10 seconds
- [ ] Invalidate cache on job updates
- [ ] Use Redis for distributed caching
- [ ] Add cache key prefix (queue:stats:{businessId})

Query Optimization (3-4 hours)​

// TODO: Optimize queries
// apps/backend/src/communication-queue/infrastructure/communication-queue.repository.ts

- [ ] Add select specific columns (not SELECT *)
- [ ] Use EXISTS for existence checks
- [ ] Add query result pagination
- [ ] Implement cursor-based pagination
- [ ] Add query time logging

Batch Processing (4-6 hours)​

// TODO: Process jobs in batches
// apps/backend/src/communication-queue/application/communication-queue.service.ts

- [ ] Process jobs in batches of 10
- [ ] Add concurrency limit
- [ ] Queue up jobs for processing
- [ ] Prevent duplicate processing
- [ ] Add lock mechanism

Frontend​

Code Splitting (2-3 hours)​

// TODO: Lazy load components
// apps/frontend-pwa/src/components/queue/QueueMonitoringPage.tsx

- [ ] Lazy load QueueJobDetailsModal
- [ ] Lazy load QueueJobsList
- [ ] Add loading fallback
- [ ] Reduce initial bundle size

Virtualization (4-6 hours)​

// TODO: Virtualize long job lists
// apps/frontend-pwa/src/components/queue/QueueJobsList.tsx

- [ ] Implement react-window or react-virtual
- [ ] Only render visible rows
- [ ] Handle scrolling efficiently
- [ ] Maintain scroll position

Debouncing (2 hours)​

// TODO: Debounce search/filter
// apps/frontend-pwa/src/hooks/useQueueJobs.ts

- [ ] Debounce filter changes
- [ ] Prevent excessive API calls
- [ ] Use useDebounce hook

🎨 Phase 5: Advanced Features (Priority: MEDIUM)​

Backend​

Dead Letter Queue (6-8 hours)​

// TODO: Implement DLQ for failed jobs
// apps/backend/src/communication-queue/domain/dead-letter-queue.domain.ts

- [ ] Create dead_letter_queue table
- [ ] Move jobs to DLQ after max attempts
- [ ] API to view DLQ contents
- [ ] API to retry from DLQ
- [ ] API to purge DLQ
- [ ] Automatic cleanup after retention period

Job Scheduling (6-8 hours)​

// TODO: Add scheduled job support
// apps/backend/src/communication-queue/domain/scheduled-job.domain.ts

- [ ] Store cron expressions
- [ ] Parse and schedule jobs
- [ ] API to create scheduled jobs
- [ ] API to update schedule
- [ ] API to pause/resume schedule
- [ ] Integration with cron library

Priority Queuing (4-6 hours)​

// TODO: Implement priority-based processing
// apps/backend/src/communication-queue/application/communication-queue.service.ts

- [ ] Process urgent jobs first
- [ ] Process high priority before normal
- [ ] Process low priority last
- [ ] Add priority-based sorting
- [ ] Update existing logic

Job Chaining (6-8 hours)​

// TODO: Support job dependencies
// apps/backend/src/communication-queue/domain/job-chain.domain.ts

- [ ] Add job dependencies table
- [ ] Track job relationships
- [ ] Only process when dependencies complete
- [ ] Handle dependency failures
- [ ] Visualize job chains

Frontend​

Bulk Actions (4-6 hours)​

// TODO: Add bulk operations
// apps/frontend-pwa/src/components/queue/QueueJobsList.tsx

- [ ] Multi-select checkbox
- [ ] Bulk retry selected jobs
- [ ] Bulk cancel selected jobs
- [ ] Bulk delete (admin only)
- [ ] Show selection count
- [ ] "Select All" checkbox

Advanced Filtering (4-6 hours)​

// TODO: Add advanced filters
// apps/frontend-pwa/src/components/queue/QueueJobsList.tsx

- [ ] Filter by date range
- [ ] Filter by priority
- [ ] Filter by error type
- [ ] Filter by communication ID
- [ ] Save filter presets
- [ ] Export filtered results

Export Functionality (3-4 hours)​

// TODO: Export jobs to CSV/JSON
// apps/frontend-pwa/src/services/exportService.ts

- [ ] Export filtered jobs to CSV
- [ ] Export stats to JSON
- [ ] Export full job details
- [ ] Download as file
- [ ] Include custom fields

Search Functionality (3-4 hours)​

// TODO: Add search
// apps/frontend-pwa/src/components/queue/QueueJobsList.tsx

- [ ] Search by job ID
- [ ] Search by communication ID
- [ ] Search by error message
- [ ] Highlight search results
- [ ] Search with debouncing

📈 Phase 6: Analytics & Reporting (Priority: LOW)​

Backend​

Metrics Collection (6-8 hours)​

// TODO: Track metrics
// apps/backend/src/communication-queue/application/metrics.service.ts

- [ ] Track processing times
- [ ] Track success/failure rates
- [ ] Track retry attempts
- [ ] Track queue depth
- [ ] Store metrics in database
- [ ] Aggregate by time periods

Reporting API (4-6 hours)​

// TODO: Add reporting endpoints
// apps/backend/src/communication-queue/interfaces/communication-queue.controller.ts

- [ ] GET /analytics/daily - Daily metrics
- [ ] GET /analytics/weekly - Weekly trends
- [ ] GET /analytics/monthly - Monthly summaries
- [ ] GET /analytics/channel - Breakdown by channel
- [ ] GET /analytics/success-rate - Success rates

Frontend​

Analytics Dashboard (6-8 hours)​

// TODO: Create analytics page
// apps/frontend-pwa/src/components/queue/QueueAnalytics.tsx

- [ ] Line chart for job trends
- [ ] Pie chart for status distribution
- [ ] Bar chart for channel breakdown
- [ ] Success rate gauge
- [ ] Processing time histogram
- [ ] Date range picker
- [ ] Export charts as images

Scheduled Reports (4-6 hours)​

// TODO: Email reports
// apps/frontend-pwa/src/services/reportService.ts

- [ ] Schedule daily reports
- [ ] Email weekly summaries
- [ ] Send alerts on failures
- [ ] Customize report content
- [ ] PDF generation

🔔 Phase 7: Alerting & Notifications (Priority: MEDIUM)​

Backend​

Alert System (6-8 hours)​

// TODO: Implement alerting
// apps/backend/src/communication-queue/application/alert.service.ts

- [ ] Alert on high failure rate
- [ ] Alert on queue backlog
- [ ] Alert on processing delays
- [ ] Configure alert thresholds
- [ ] Support multiple channels (email, Slack, SMS)
- [ ] Rate limit alert frequency
- [ ] Alert escalation

Notification Preferences (4-6 hours)​

// TODO: User notification settings
// apps/backend/src/communication-queue/domain/notification-preferences.domain.ts

- [ ] Store user preferences
- [ ] Email notifications
- [ ] Slack webhooks
- [ ] SMS alerts
- [ ] Quiet hours
- [ ] Notification frequency

Frontend​

Alert Configuration (4-6 hours)​

// TODO: Alert management UI
// apps/frontend-pwa/src/components/queue/QueueAlertSettings.tsx

- [ ] Configure alert thresholds
- [ ] Set notification channels
- [ ] Enable/disable alert types
- [ ] Test alert delivery
- [ ] View alert history

Real-time Notifications (6-8 hours)​

// TODO: WebSocket integration
// apps/frontend-pwa/src/hooks/useQueueWebSocket.ts

- [ ] Connect to WebSocket
- [ ] Receive real-time job updates
- [ ] Show toast notifications
- [ ] Update dashboard live
- [ ] Handle connection loss
- [ ] Reconnect automatically

🌐 Phase 8: Multi-Tenancy & Scaling (Priority: LOW)​

Backend​

Business Isolation (4-6 hours)​

// TODO: Ensure data isolation
// apps/backend/src/communication-queue/application/communication-queue.service.ts

- [ ] Add business ID check to all queries
- [ ] Prevent cross-business access
- [ ] Add middleware validation
- [ ] Audit business access

Horizontal Scaling (6-8 hours)​

// TODO: Support multiple instances
// apps/backend/src/communication-queue/application/communication-queue.service.ts

- [ ] Add distributed locking
- [ ] Use Redis for coordination
- [ ] Prevent duplicate processing
- [ ] Handle instance failures
- [ ] Load balancing

Database Sharding (8-10 hours)​

// TODO: Shard by business ID
// Migration scripts

- [ ] Design sharding strategy
- [ ] Create shard routing
- [ ] Migrate existing data
- [ ] Update queries
- [ ] Monitor performance

🧪 Phase 9: Testing & QA​

Load Testing (4-6 hours)​

  • Test with 10,000 jobs
  • Test with 100,000 jobs
  • Test concurrent retries
  • Test database performance
  • Test API response times
  • Test memory usage
  • Test CPU usage

Stress Testing (4-6 hours)​

  • Simulate API failures
  • Simulate database failures
  • Test with max queue depth
  • Test timeout scenarios
  • Test recovery procedures

Security Testing (4-6 hours)​

  • SQL injection tests
  • XSS tests
  • CSRF tests
  • Authentication bypass
  • Permission escalation
  • Rate limit bypass

📚 Phase 10: Documentation & Training​

Documentation (6-8 hours)​

  • API documentation (enhance)
  • Architecture diagrams
  • Database schema docs
  • Deployment guide
  • Troubleshooting guide
  • FAQ document
  • Video tutorials

Training Materials (4-6 hours)​

  • User manual
  • Admin guide
  • Developer guide
  • Training slides
  • Video walkthroughs
  • Best practices guide

🎯 Immediate Next Steps (This Week)​

Priority 1: Must Have​

  1. ⚠️ Add route and navigation (10 mins)

    • Add to router
    • Add to sidebar
    • Test basic functionality

  2. ⚠️ Add authentication guards (1 hour)

    • Check user authentication
    • Validate business access
    • Handle unauthorized access

  3. ⚠️ Add permission checks (2 hours)

    • Create permission constants
    • Check permissions in UI
    • Hide unauthorized actions

  4. ⚠️ Write basic tests (4 hours)

    • Service unit tests
    • Hook tests
    • Critical path integration tests

Priority 2: Should Have​

  1. 📝 Add audit logging (3 hours)

    • Log all actions
    • Store in database
    • Create audit log viewer

  2. 📝 Add rate limiting (2 hours)

    • Prevent abuse
    • Configure limits
    • Add throttling

Priority 3: Nice to Have​

  1. 📊 Add analytics (optional)
  2. 🔔 Add alerting (optional)
  3. 📤 Add export (optional)

📊 Progress Tracking​

Overall Progress: 20% Complete​

PhaseStatusProgressEst. Time
Phase 1: Core Implementation✅ Complete100%Done
Phase 2: Testing⏳ Pending0%20-30 hours
Phase 3: Security⏳ Pending0%15-20 hours
Phase 4: Performance⏳ Pending0%15-20 hours
Phase 5: Advanced Features⏳ Pending0%30-40 hours
Phase 6: Analytics⏳ Pending0%15-20 hours
Phase 7: Alerting⏳ Pending0%15-20 hours
Phase 8: Scaling⏳ Pending0%20-25 hours
Phase 9: QA⏳ Pending0%15 hours
Phase 10: Documentation⏳ Pending0%10-15 hours

Total Estimated Time: 155-215 hours (~4-6 weeks of full-time work)

🎯 Success Criteria​

Phase 1 Complete ✅​

  • ✅ All features working
  • ✅ Zero compilation errors
  • ✅ Zero linting errors
  • ✅ Comprehensive documentation

Phase 2 (Testing) - Target​

  • 🎯 80%+ test coverage
  • 🎯 All critical paths tested
  • 🎯 CI/CD integration

Phase 3 (Security) - Target​

  • 🎯 All endpoints secured
  • 🎯 Permission-based access
  • 🎯 Audit logging active

Production Ready - Target​

  • 🎯 All phases complete
  • 🎯 Zero critical bugs
  • 🎯 Performance benchmarks met
  • 🎯 Security audit passed

📞 Notes​

Known Issues​

  • None currently

Technical Debt​

  • None currently

Dependencies​

  • Redis for caching (Phase 4)
  • WebSocket server for real-time (Phase 7)
  • Email service for alerts (Phase 7)
  • Analytics database (Phase 6)

Risks​

  • Performance with large datasets (mitigate with indexing)
  • Concurrent processing (mitigate with locking)
  • Cost of cloud resources (optimize queries)

🔄 Last Updated​

  • Date: October 26, 2025
  • Next Review: Weekly
  • Owner: Development Team

This roadmap is a living document and will be updated as progress is made and priorities change.