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

memory-bank/features/version-control/implementation-plan.md

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+# Version Control System Enhancement Plan
+
+## Current Implementation
+The project currently uses django-simple-history with custom extensions:
+- `HistoricalModel` base class for history tracking
+- `HistoricalChangeMixin` for change tracking and diff computation
+- `HistoricalSlug` for slug history management
+
+## Enhanced Version Control Standards
+
+### 1. Core VCS Features
+
+#### Branching System
+```python
+class VersionBranch:
+    name = models.CharField(max_length=255)
+    parent = models.ForeignKey('self', null=True)
+    created_at = models.DateTimeField(auto_now_add=True)
+    metadata = models.JSONField()
+```
+
+- Support for feature branches
+- Parallel version development
+- Branch merging capabilities
+- Conflict resolution system
+
+#### Tagging System
+```python
+class VersionTag:
+    name = models.CharField(max_length=255)
+    version = models.ForeignKey(HistoricalRecord)
+    metadata = models.JSONField()
+```
+
+- Named versions (releases, milestones)
+- Semantic versioning support
+- Tag annotations and metadata
+
+#### Change Sets
+```python
+class ChangeSet:
+    branch = models.ForeignKey(VersionBranch)
+    changes = models.JSONField()  # Structured changes
+    metadata = models.JSONField()
+    dependencies = models.JSONField()
+```
+
+- Atomic change grouping
+- Dependency tracking
+- Rollback capabilities
+
+### 2. Full Stack Integration
+
+#### Frontend Integration
+
+##### Version Control UI
+```typescript
+interface VersionControlUI {
+  // Core Components
+  VersionHistory: Component;
+  BranchView: Component;
+  DiffViewer: Component;
+  MergeResolver: Component;
+  
+  // State Management
+  versionStore: {
+    currentVersion: Version;
+    branches: Branch[];
+    history: HistoryEntry[];
+    pendingChanges: Change[];
+  };
+  
+  // Actions
+  actions: {
+    createBranch(): Promise<void>;
+    mergeBranch(): Promise<void>;
+    revertChanges(): Promise<void>;
+    resolveConflicts(): Promise<void>;
+  };
+}
+```
+
+##### Real-time Collaboration
+```typescript
+interface CollaborationSystem {
+  // WebSocket integration
+  socket: WebSocket;
+  
+  // Change tracking
+  pendingChanges: Map<string, Change>;
+  
+  // Conflict resolution
+  conflictResolver: ConflictResolver;
+}
+```
+
+##### HTMX Integration
+```html
+<!-- Version Control Components -->
+<div class="version-control-panel"
+     hx-get="/api/vcs/status"
+     hx-trigger="load, every 30s">
+  
+  <!-- Branch Selector -->
+  <div class="branch-selector"
+       hx-get="/api/vcs/branches"
+       hx-target="#branch-list">
+  </div>
+  
+  <!-- Change History -->
+  <div class="history-view"
+       hx-get="/api/vcs/history"
+       hx-trigger="load, branch-change from:body">
+  </div>
+  
+  <!-- Merge Interface -->
+  <div class="merge-panel"
+       hx-post="/api/vcs/merge"
+       hx-trigger="merge-requested">
+  </div>
+</div>
+```
+
+#### Backend Integration
+
+##### API Layer
+```python
+class VersionControlViewSet(viewsets.ModelViewSet):
+    @action(detail=True, methods=['post'])
+    def create_branch(self, request):
+        """Create new version branch"""
+        
+    @action(detail=True, methods=['post'])
+    def merge_branch(self, request):
+        """Merge branches with conflict resolution"""
+        
+    @action(detail=True, methods=['post'])
+    def tag_version(self, request):
+        """Create version tag"""
+        
+    @action(detail=True, methods=['get'])
+    def changelog(self, request):
+        """Get structured change history"""
+```
+
+##### Change Tracking System
+```python
+class ChangeTracker:
+    """Track changes across the system"""
+    def track_change(self, instance, change_type, metadata=None):
+        """Record a change in the system"""
+        
+    def batch_track(self, changes):
+        """Track multiple changes atomically"""
+        
+    def compute_diff(self, version1, version2):
+        """Compute detailed difference between versions"""
+```
+
+### 3. Data Integrity & Validation
+
+#### Validation System
+```python
+class VersionValidator:
+    """Validate version control operations"""
+    def validate_branch_creation(self, branch_data):
+        """Validate branch creation request"""
+        
+    def validate_merge(self, source_branch, target_branch):
+        """Validate branch merge possibility"""
+        
+    def validate_revert(self, version, target_state):
+        """Validate revert operation"""
+```
+
+#### Consistency Checks
+```python
+class ConsistencyChecker:
+    """Ensure data consistency"""
+    def check_reference_integrity(self):
+        """Verify all version references are valid"""
+        
+    def verify_branch_hierarchy(self):
+        """Verify branch relationships"""
+        
+    def validate_change_sets(self):
+        """Verify change set consistency"""
+```
+
+### 4. Advanced Features
+
+#### Merge Strategies
+```python
+class MergeStrategy:
+    """Define how merges are handled"""
+    def auto_merge(self, source, target):
+        """Attempt automatic merge"""
+        
+    def resolve_conflicts(self, conflicts):
+        """Handle merge conflicts"""
+        
+    def apply_resolution(self, resolution):
+        """Apply conflict resolution"""
+```
+
+#### Dependency Management
+```python
+class DependencyTracker:
+    """Track version dependencies"""
+    def track_dependencies(self, change_set):
+        """Record dependencies for changes"""
+        
+    def verify_dependencies(self, version):
+        """Verify all dependencies are met"""
+        
+    def resolve_dependencies(self, missing_deps):
+        """Resolve missing dependencies"""
+```
+
+## Implementation Phases
+
+### Phase 1: Core VCS Enhancement (Weeks 1-4)
+1. Implement branching system
+2. Add tagging support
+3. Develop change set tracking
+4. Create basic frontend interface
+
+### Phase 2: Full Stack Integration (Weeks 5-8)
+1. Build comprehensive frontend UI
+2. Implement real-time collaboration
+3. Develop API endpoints
+4. Add WebSocket support
+
+### Phase 3: Advanced Features (Weeks 9-12)
+1. Implement merge strategies
+2. Add dependency tracking
+3. Enhance conflict resolution
+4. Build monitoring system
+
+### Phase 4: Testing & Optimization (Weeks 13-16)
+1. Comprehensive testing
+2. Performance optimization
+3. Security hardening
+4. Documentation completion
+
+## Success Metrics
+
+### Technical Metrics
+- Branch operation speed (<500ms)
+- Merge success rate (>95%)
+- Conflict resolution time (<5min avg)
+- Version retrieval speed (<200ms)
+
+### User Experience Metrics
+- UI response time (<300ms)
+- Successful merges (>90%)
+- User satisfaction score (>4.5/5)
+- Feature adoption rate (>80%)
+
+### System Health Metrics
+- System uptime (>99.9%)
+- Data integrity (100%)
+- Backup success rate (100%)
+- Recovery time (<5min)
+
+## Monitoring & Maintenance
+
+### System Monitoring
+- Real-time performance tracking
+- Error rate monitoring
+- Resource usage tracking
+- User activity monitoring
+
+### Maintenance Tasks
+- Regular consistency checks
+- Automated testing
+- Performance optimization
+- Security updates
+
+## Security Considerations
+
+### Access Control
+- Role-based permissions
+- Audit logging
+- Activity monitoring
+- Security scanning
+
+### Data Protection
+- Encryption at rest
+- Secure transmission
+- Regular backups
+- Data retention policies