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# Enhancement Scope and Integration Strategy
## Enhancement Overview
**Enhancement Type:****Major Feature Addition** (3-Portal Cohort Management System)
**Scope:** Transform the single-portal DocuSeal platform into a specialized 3-portal cohort management system for South African private training institutions. The system will manage training cohorts (learnerships, internships, candidacies) through a coordinated workflow involving institution admins, students, and sponsors.
**Integration Impact:****Significant Impact** (substantial existing code changes required)
## Integration Approach
**Code Integration Strategy:**
- **Additive Approach:** All new functionality will be added as new models, controllers, and components without modifying existing DocuSeal core logic
- **Extension Pattern:** Extend existing authentication and authorization to support new role types
- **Service Layer:** Create new service objects in `lib/cohorts/` directory for cohort-specific business logic
- **Event-Driven:** Leverage existing webhook infrastructure for cohort workflow notifications
**Database Integration:**
- **New Tables:** Create 5 new tables (`cohorts`, `cohort_enrollments`, `institutions`, `sponsors`, `document_verifications`) with foreign keys to existing tables
- **No Schema Modifications:** Existing tables remain unchanged, only new relationships added
- **Migration Strategy:** Sequential migrations with rollback capability, tested on production-like data
- **Data Integrity:** Use database transactions for cohort state transitions
**API Integration:**
- **Endpoint Extension:** New endpoints under `/api/v1/cohorts/*` following existing RESTful patterns
- **Authentication Reuse:** Leverage existing Devise + JWT authentication without modification
- **Submission Integration:** Use existing submission APIs for document signing workflows
- **Versioning:** No new API version needed, endpoints extend v1
**UI Integration:**
- **Portal Architecture:** Three separate Vue-based portals (Admin, Student, Sponsor) with custom TailwindCSS design
- **Component Reuse:** Embed existing DocuSeal form builder and signing components within new portal frameworks
- **Navigation:** Role-based portal switching via new navigation layer
- **Design System:** Custom TailwindCSS (replacing DaisyUI) for portals while maintaining mobile responsiveness
## Compatibility Requirements
**Existing API Compatibility:****MAINTAINED**
- All new endpoints follow existing DocuSeal API patterns
- No breaking changes to existing public APIs
- Existing authentication mechanisms remain unchanged
**Database Schema Compatibility:****MAINTAINED**
- New tables only, no modifications to existing tables
- Foreign key relationships to existing tables (users, submissions, templates)
- Backward compatibility through additive schema changes
**UI/UX Consistency:****ADAPTED**
- **Challenge:** PRD specifies custom UI/UX (not DaisyUI) for portals
- **Solution:** Maintain mobile-first responsive principles, consistent interaction patterns, but allow custom design system
- **Existing UI:** DocuSeal's existing DaisyUI interface remains unchanged for legacy features
**Performance Impact:****ACCEPTABLE**
- **Target:** Not exceed current memory usage by more than 20%
- **Mitigation:** Pagination, lazy loading, background processing for large cohorts
- **Monitoring:** Extend existing metrics to track cohort-specific performance
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