# Change Approval Workflow Implementation Plan  

   ## Core Requirements  
   1. Configurable approval stages  
   2. Role-based reviewer assignments  
   3. Parallel vs sequential approvals  
   4. Audit trail of decisions  
   5. Integration with existing locks/comments  

   ## Technical Integration  
   - **State Machine**  
     Extend StateMachine interface:  
     ```typescript  
     interface ApprovalStateMachine extends StateMachine {  
         currentStage: ApprovalStage;  
         requiredApprovers: UserRef[];  
         overridePolicy: 'majority' | 'unanimous';  
     }  
     ```  

   - **Model Extensions**  
     Enhance ChangeSet (line 7):  
     ```python  
     class ChangeSet(models.Model):  
         approval_state = models.JSONField(default=list)  # [{stage: 1, approvers: [...]}]  
         approval_history = models.JSONField(default=list)  
     ```  

   - **API Endpoints**  
     Add to VersionControlViewSet (line 128):  
     ```python  
     @action(detail=True, methods=['post'])  
     def submit_for_approval(self, request, pk=None):  
         """Transition change set to approval state"""  
     ```  

   ## Security Considerations  
   - Approval chain validation  
   - Non-repudiation requirements  
   - Conflict resolution protocols  
   - Approval delegation safeguards  

   ## Phase Plan  
   1. **Week 1**: State machine implementation  
   2. **Week 2**: Approval UI components  
   3. **Week 3**: Integration testing  
   4. **Week 4**: Deployment safeguards