#347 Wire collaboration workflows into the app and align notifications with real actor identity

🎯 Overview

This PR resolves critical issues with the collaboration module by properly mounting it in the application and fixing identity mapping problems that caused notifications to be misrouted. The collaboration system now provides a robust, transactional workflow for artist collaborations with proper permission controls and validation.

🔧 Key Fixes

1. Module Mounting

✅ Mounted CollaborationModule in app.module.ts
✅ All collaboration endpoints are now live and accessible
✅ Proper dependency injection and module configuration

2. Identity Mapping Resolution

🎯 Root Issue Fixed: Notifications were using artistId instead of userId
✅ Updated sendCollaborationInvite() to target artist.userId
✅ Updated sendCollaborationResponse() to target track owner's userId
✅ All notifications now reach the correct user accounts

3. Enhanced Transactional Safety

🔄 All write operations wrapped in database transactions
🔄 Proper rollback mechanisms on failures
🔄 Event emission only after successful commits
🔄 Data integrity guarantees

🚀 New Features

Enhanced API Endpoints

GET    /collaborations/invitations/pending    # Get user's pending invitations
DELETE /collaborations/:id                    # Remove collaborator (track owner only)
GET    /collaborations/tracks/:id/stats       # Collaboration statistics

Improved Validation Rules

Split Percentage: 0.01%-100% bounds with total ≤100% cap
Primary Artist Protection: Must retain minimum 0.01% split
Duplicate Prevention: No self-invitation or duplicate invites
Response Validation: Required rejection reasons, prevent duplicate responses

Permission Enhancements

Track ownership verification using track.artist.userId
Response permissions validated against collaboration.artist.userId
Removal permissions restricted to track owners only

📊 Files Modified

Core Changes

backend/src/app.module.ts - Added CollaborationModule import
backend/src/collaboration/collaboration.service.ts - Identity fixes & validation
backend/src/collaboration/collaboration.controller.ts - New endpoints
backend/src/notifications/notifications.service.ts - Identity mapping fixes

New Files

backend/src/collaboration/README.md - Comprehensive documentation
backend/src/collaboration/collaboration.service.spec.ts - Full test suite
backend/src/collaboration/collaboration.service.simple.spec.ts - Focused tests

🧪 Testing Coverage

Test Categories

✅ Identity Validation: User vs Artist ID handling
✅ Permission Tests: Access control verification
✅ Validation Rules: Split percentage and duplicate prevention
✅ Transaction Safety: Rollback scenarios
✅ Notification Targeting: Correct recipient verification

Key Test Scenarios

Track ownership validation
Self-invitation prevention
Split percentage boundary testing
Duplicate invitation blocking
Permission enforcement
Transaction rollback on failures

📋 Before vs After

Before (Issues)

// ❌ Wrong notification target
await this.notificationsService.sendCollaborationInvite({
  artistId: artist.id, // Artist entity, not user
  // ...
});

// ❌ Module not mounted
// Collaboration endpoints returned 404

// ❌ No transaction safety
// Partial state corruption possible

After (Fixed)

// ✅ Correct notification target
await this.notificationsService.sendCollaborationInvite({
  userId: artist.userId, // Actual user account
  // ...
});

// ✅ Module properly mounted
// All endpoints accessible with proper guards

// ✅ Full transaction safety
// Atomic operations with rollback

🔒 Security Improvements

Identity Verification

All operations validate requesting user's identity
Artist-to-user mapping verified before permissions
Notifications sent to verified user accounts only

Access Control

JWT authentication required for all operations
Role-based permissions enforced at service level
Track ownership validated before modifications

Data Integrity

Transactional operations prevent corruption
Unique constraints prevent duplicates
Validation rules ensure consistency

📈 Performance Considerations

Database Optimizations

Indexed queries for track collaborations
Efficient join operations
Minimal transaction scopes

Notification Efficiency

Async notification sending
Event-driven updates
Proper error handling

🎉 Acceptance Criteria Met

✅ Collaboration endpoints are live and correctly guarded
✅ Notifications target the intended accounts reliably
✅ Duplicate invites and invalid split configurations are blocked consistently
✅ Tests cover owner actions, collaborator responses, and notification recipient correctness

🔗 Related Issues

Fixes: #347 - Wire collaboration workflows into the app and align notifications with real actor identity
Complexity: High (200 points)
Labels: stellar-wave, help-wanted, backend, collaboration, notifications

🚀 Deployment Notes

Database Migrations

No database schema changes required - existing collaborations table is sufficient.

Environment Variables

No new environment variables needed.

Breaking Changes

Notification Recipients: Now uses userId instead of artistId (fix, not breaking)
Validation: Stricter split percentage validation (enforces existing rules)
Permissions: Enhanced permission checks (security improvement)

📝 Documentation

Comprehensive API documentation added to backend/src/collaboration/README.md
Identity mapping rules clearly documented
Validation rules and security considerations detailed
Performance and monitoring guidelines included

🧪 Testing Commands

# Run collaboration tests
npm test -- --testPathPattern=collaboration

# Run with coverage
npm run test:cov -- --testPathPattern=collaboration

# Run specific test suites
npm test collaboration.service.simple.spec.ts

👥 Contributors

@ricky - Implementation and testing
Reviewers requested for collaboration workflow validation

This PR represents a significant improvement to the collaboration system, ensuring reliable notifications, proper identity management, and robust transactional safety for all collaboration workflows.

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