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Data Management & User System Enhancement - Brownfield Epic

Epic Goal​

Enhance the existing data import and user management system to provide comprehensive data validation, migration capabilities, and user access control that seamlessly extends the current NestJS/Prisma architecture.

Epic Description​

Existing System Context:

  • Current functionality: Basic data import service for legacy system migration with complex data transformation (Sites, Clients, Contacts, Cadastres) and simple user management with client association
  • Technology stack: NestJS controllers/services, Prisma ORM, PostgreSQL database, Axios for external data, file system operations
  • Integration points: All major entities (Client, Site, Contact, Cadastre, ApporteurAffaire), User with Client relationship
  • Existing patterns: Service-based data transformation, legacy interface mapping, role-based user system

Enhancement Details:

  • What's being added/changed: Complete data management workflow including import validation, data quality checks, user access control, and administrative capabilities for system maintenance
  • How it integrates: Extends existing ImportService with validation pipelines, adds user management capabilities with role-based permissions, leverages all existing entity relationships
  • Success criteria: Robust data import with validation operational, user management with proper access control functional, data integrity maintained, existing functionality preserved

Stories​

  1. Story 1: Enhanced Data Import & Validation Pipeline

    • Implement comprehensive data validation for all import operations (Sites, Clients, Contacts, Cadastres)
    • Add data quality checks, duplicate detection, and error reporting
    • Create import rollback capabilities and data consistency verification

  2. Story 2: User Management & Access Control System

    • Enhance user CRUD operations with role-based permissions and access control
    • Implement user authentication workflows and session management
    • Create client-user relationship management and access restrictions

  3. Story 3: System Administration & Data Maintenance

    • Add administrative tools for data cleanup, migration monitoring, and system health checks
    • Implement bulk data operations and maintenance utilities
    • Create system monitoring and logging for import operations and user activities

Compatibility Requirements​

  • Existing import functionality remains unchanged (legacy data transformation preserved)
  • Database schema changes are backward compatible (additive fields only)
  • User system follows existing role-based patterns
  • Performance impact is minimal (optimized batch operations)

Risk Mitigation​

  • Primary Risk: Breaking existing legacy data import processes and user-client relationships
  • Mitigation: All new features are additive, existing import service methods preserved, comprehensive data validation testing before production migration
  • Rollback Plan: Database migrations are reversible, new validation can be bypassed via feature flags, existing import functionality isolated

Definition of Done​

  • All stories completed with acceptance criteria met
  • Existing import functionality verified through testing
  • User management and client relationships working correctly
  • Data integrity validation operational
  • No regression in existing legacy data transformation capabilities

Story Manager Handoff​

"Please develop detailed user stories for this brownfield epic. Key considerations:

  • This is an enhancement to an existing system running NestJS/Prisma/PostgreSQL
  • Integration points: All major entities (Client, Site, Contact, Cadastre, ApporteurAffaire), User with Client relationship, legacy data transformation interfaces
  • Existing patterns to follow: Service-based architecture, complex data transformation logic, role-based user system, file system operations for import
  • Critical compatibility requirements: Preserve existing import functionality, maintain user-client relationships, follow existing role patterns, ensure data integrity throughout migration processes
  • Each story must include verification that existing import functionality (legacy data transformation, entity creation, relationship mapping) remains intact

The epic should maintain system integrity while delivering comprehensive data management and user administration capabilities."