Add version control system functionality with branch management, history tracking, and merge operations

memory-bank/features/version-control/technical-guide.md

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+# Version Control System Technical Implementation Guide
+
+## System Overview
+The version control system implements full VCS capabilities with branching, merging, and collaboration features, building upon django-simple-history while adding robust versioning capabilities across the full stack.
+
+## Core VCS Features
+
+### 1. Branching System
+
+```python
+from vcs.models import VersionBranch, VersionTag, ChangeSet
+
+class BranchManager:
+    def create_branch(name: str, parent: Optional[VersionBranch] = None):
+        """Create a new branch"""
+        return VersionBranch.objects.create(
+            name=name,
+            parent=parent,
+            metadata={'created_by': current_user}
+        )
+    
+    def merge_branches(source: VersionBranch, target: VersionBranch):
+        """Merge two branches with conflict resolution"""
+        merger = MergeStrategy()
+        return merger.merge(source, target)
+
+    def list_branches():
+        """Get all branches with their relationships"""
+        return VersionBranch.objects.select_related('parent').all()
+```
+
+### 2. Change Tracking
+
+```python
+class ChangeTracker:
+    def record_change(model_instance, change_type, metadata=None):
+        """Record a change in the system"""
+        return ChangeSet.objects.create(
+            instance=model_instance,
+            change_type=change_type,
+            metadata=metadata or {},
+            branch=get_current_branch()
+        )
+
+    def get_changes(branch: VersionBranch):
+        """Get all changes in a branch"""
+        return ChangeSet.objects.filter(branch=branch).order_by('created_at')
+```
+
+### 3. Frontend Integration
+
+#### State Management (React/TypeScript)
+```typescript
+interface VCSState {
+  currentBranch: Branch;
+  branches: Branch[];
+  changes: Change[];
+  conflicts: Conflict[];
+}
+
+class VCSStore {
+  private state: VCSState;
+  
+  async switchBranch(branchName: string): Promise<void> {
+    // Implementation
+  }
+  
+  async createBranch(name: string): Promise<void> {
+    // Implementation
+  }
+  
+  async mergeBranch(source: string, target: string): Promise<void> {
+    // Implementation
+  }
+}
+```
+
+#### UI Components
+```typescript
+// Branch Selector Component
+const BranchSelector: React.FC = () => {
+  const branches = useVCSStore(state => state.branches);
+  
+  return (
+    <div className="branch-selector">
+      {branches.map(branch => (
+        <BranchItem key={branch.id} branch={branch} />
+      ))}
+    </div>
+  );
+};
+
+// Change History Component
+const ChangeHistory: React.FC = () => {
+  const changes = useVCSStore(state => state.changes);
+  
+  return (
+    <div className="change-history">
+      {changes.map(change => (
+        <ChangeItem key={change.id} change={change} />
+      ))}
+    </div>
+  );
+};
+```
+
+### 4. API Integration
+
+#### Django REST Framework ViewSets
+```python
+class VCSViewSet(viewsets.ModelViewSet):
+    @action(detail=True, methods=['post'])
+    def create_branch(self, request):
+        name = request.data.get('name')
+        parent = request.data.get('parent')
+        
+        branch = BranchManager().create_branch(name, parent)
+        return Response(BranchSerializer(branch).data)
+
+    @action(detail=True, methods=['post'])
+    def merge(self, request):
+        source = request.data.get('source')
+        target = request.data.get('target')
+        
+        try:
+            result = BranchManager().merge_branches(source, target)
+            return Response(result)
+        except MergeConflict as e:
+            return Response({'conflicts': e.conflicts}, status=409)
+```
+
+### 5. Conflict Resolution
+
+```python
+class ConflictResolver:
+    def detect_conflicts(source: ChangeSet, target: ChangeSet) -> List[Conflict]:
+        """Detect conflicts between changes"""
+        conflicts = []
+        # Implementation
+        return conflicts
+
+    def resolve_conflict(conflict: Conflict, resolution: Resolution):
+        """Apply conflict resolution"""
+        with transaction.atomic():
+            # Implementation
+```
+
+### 6. Real-time Collaboration
+
+```python
+class CollaborationConsumer(AsyncWebsocketConsumer):
+    async def connect(self):
+        await self.channel_layer.group_add(
+            f"branch_{self.branch_id}",
+            self.channel_name
+        )
+
+    async def receive_change(self, event):
+        """Handle incoming changes"""
+        change = event['change']
+        await self.process_change(change)
+```
+
+## Best Practices
+
+### 1. Branch Management
+- Create feature branches for isolated development
+- Use meaningful branch names
+- Clean up merged branches
+- Regular synchronization with main branch
+
+### 2. Change Management
+- Atomic changes
+- Clear change descriptions
+- Related changes grouped in changesets
+- Regular commits
+
+### 3. Conflict Resolution
+- Early conflict detection
+- Clear conflict documentation
+- Structured resolution process
+- Team communication
+
+### 4. Performance Optimization
+- Efficient change tracking
+- Optimized queries
+- Caching strategy
+- Background processing
+
+### 5. Security
+- Access control
+- Audit logging
+- Data validation
+- Secure transmission
+
+## Implementation Examples
+
+### 1. Creating a New Branch
+```python
+branch_manager = BranchManager()
+feature_branch = branch_manager.create_branch(
+    name="feature/new-ui",
+    parent=main_branch
+)
+```
+
+### 2. Recording Changes
+```python
+change_tracker = ChangeTracker()
+change = change_tracker.record_change(
+    instance=model_object,
+    change_type="update",
+    metadata={"field": "title", "reason": "Improvement"}
+)
+```
+
+### 3. Merging Branches
+```python
+try:
+    result = branch_manager.merge_branches(
+        source=feature_branch,
+        target=main_branch
+    )
+except MergeConflict as e:
+    conflicts = e.conflicts
+    resolution = conflict_resolver.resolve_conflicts(conflicts)
+    result = branch_manager.apply_resolution(resolution)
+```
+
+## Error Handling
+
+### 1. Branch Operations
+```python
+try:
+    branch = branch_manager.create_branch(name)
+except BranchExistsError:
+    # Handle duplicate branch
+except InvalidBranchNameError:
+    # Handle invalid name
+```
+
+### 2. Merge Operations
+```python
+try:
+    result = branch_manager.merge_branches(source, target)
+except MergeConflictError as e:
+    # Handle merge conflicts
+except InvalidBranchError:
+    # Handle invalid branch
+```
+
+## Monitoring
+
+### 1. Performance Monitoring
+```python
+class VCSMonitor:
+    def track_operation(operation_type, duration):
+        """Track operation performance"""
+        
+    def check_system_health():
+        """Verify system health"""
+```
+
+### 2. Error Tracking
+```python
+class ErrorTracker:
+    def log_error(error_type, details):
+        """Log system errors"""
+        
+    def analyze_errors():
+        """Analyze error patterns"""
+```
+
+## Testing
+
+### 1. Unit Tests
+```python
+class BranchTests(TestCase):
+    def test_branch_creation(self):
+        """Test branch creation"""
+        
+    def test_branch_merge(self):
+        """Test branch merging"""
+```
+
+### 2. Integration Tests
+```python
+class VCSIntegrationTests(TestCase):
+    def test_complete_workflow(self):
+        """Test complete VCS workflow"""
+        
+    def test_conflict_resolution(self):
+        """Test conflict resolution"""
+```
+
+## Deployment Considerations
+
+### 1. Database Migrations
+- Create necessary tables
+- Add indexes
+- Handle existing data
+
+### 2. Cache Setup
+- Configure Redis
+- Set up caching strategy
+- Implement cache invalidation
+
+### 3. Background Tasks
+- Configure Celery
+- Set up task queues
+- Monitor task execution
+
+## Maintenance
+
+### 1. Regular Tasks
+- Clean up old branches
+- Optimize database
+- Update indexes
+- Verify backups
+
+### 2. Monitoring Tasks
+- Check system health
+- Monitor performance
+- Track error rates
+- Analyze usage patterns