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ln-720-structure-migrator

Type: L2 Domain Coordinator Category: 7XX Project Bootstrap Parent: ln-700-project-bootstrap

Coordinates project restructuring to Clean Architecture. Mode-aware: delegates to workers with appropriate mode parameters based on CREATE/TRANSFORM pipeline.

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Purpose & Scope

Aspect	Description
Input	Current project structure + mode (CREATE/TRANSFORM) from ln-700
Output	Restructured project with Clean Architecture
Workers	See Workers table below

Workers

Worker	Role	CREATE mode	TRANSFORM mode
ln-721	Frontend structure	SCAFFOLD (generate starter)	RESTRUCTURE (migrate monolith)
ln-722	Backend generator	RUN (generate backend)	RUN (generate backend)
ln-723	Seed data	GENERATE (from entities)	MIGRATE (from ORM schemas)
ln-724	Artifact cleaner	SKIP (no artifacts)	CONDITIONAL (only if platform detected)

Scope boundaries:

• Analyzes current project structure (TRANSFORM) or accepts target config (CREATE)
• Generates migration plan or scaffold plan
• Delegates to specialized workers via Task tool
• Verifies final result

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Workflow

Phase	Name	CREATE mode	TRANSFORM mode
1	Analyze	Receive target stack config	Scan structure, detect framework, map files
2	Plan	Calculate scaffold actions	Calculate moves, identify conflicts
3	Execute	Delegate: ln-721 SCAFFOLD → ln-722 → ln-723 GENERATE	Delegate: ln-724 (conditional) → ln-721 RESTRUCTURE → ln-722 → ln-723 MIGRATE
4	Verify	Check file structure, validate configs	Run builds, check imports, validate structure

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Target Structures

Frontend (React)

src/frontend/
├── public/
├── src/
│   ├── components/
│   │   ├── layout/      # AppLayout, Header, Sidebar
│   │   └── ui/          # Reusable UI components
│   ├── contexts/        # React contexts
│   ├── hooks/           # Custom hooks
│   ├── lib/             # Utilities, API clients
│   ├── pages/           # Page components
│   │   └── {Feature}/   # Feature-specific files
│   ├── App.tsx
│   ├── main.tsx
│   └── index.css
├── package.json
├── vite.config.ts
└── tsconfig.json

Backend (.NET Clean Architecture)

src/
├── {Project}.Api/
│   ├── Controllers/
│   ├── DTOs/
│   ├── Middleware/
│   ├── MockData/
│   ├── Extensions/
│   ├── Program.cs
│   └── appsettings.json
├── {Project}.Domain/
│   ├── Entities/
│   ├── Enums/
│   └── Common/
├── {Project}.Services/
│   └── Interfaces/
├── {Project}.Repositories/
│   └── Interfaces/
└── {Project}.Shared/

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Delegation Protocol

To ln-724 (Artifact Cleaner)

When to invoke: TRANSFORM mode AND platform artifacts detected (.replit, .stackblitzrc, sandbox.config.json, glitch.json). Skip conditions: CREATE mode OR no platform config files found.

Context:
  projectPath: /project
  skipPreview: false
Options:
  # ln-724 auto-detects platform, no need to specify
  cleanConfigFiles: true
  cleanDirectories: true
  cleanPackages: true
  cleanBuildConfig: true
  cleanCodeComments: true
  cleanGitignore: true

To ln-721 (Frontend)

Context:
  mode: SCAFFOLD | RESTRUCTURE          # From pipeline mode
  # SCAFFOLD mode:
  targetPath: /project/src/frontend
  projectName: MyApp
  # RESTRUCTURE mode:
  sourcePath: /project/client
  targetPath: /project/src/frontend
  framework: react
  features:
    - Dashboard
    - Settings
    - Profile
Options:
  # RESTRUCTURE only:
  splitMonolithicFiles: true
  extractConstants: true
  extractTypes: true
  createComponentLibrary: true

To ln-722 (Backend)

Context:
  projectName: MyApp
  targetPath: /project/src
  targetFramework: net10.0
  features:
    - Dashboard
    - Users
Options:
  createMockData: true
  addSwagger: true
  addHealthChecks: true

To ln-723 (Seed Data)

Context:
  mode: MIGRATE | GENERATE              # From pipeline mode
  targetFormat: csharp | typescript | python | json | sql
  # MIGRATE mode:
  sourceORM: auto                        # Auto-detect (drizzle/prisma/typeorm/efcore/sqlalchemy/django)
  sourcePath: /project/shared/schema.ts
  # GENERATE mode:
  entities:                              # Optional — if empty, starter template used
    - name: User
      fields: [id, name, email, role, createdAt]
    - name: Role
      fields: [id, name, description]
  targetPath: /project/src/MyApp.Api/MockData

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Critical Rules

• Orchestrator Pattern: Analyze and delegate via Task tool, do not execute transformations directly
• Mode Awareness: Pass correct mode to all workers — CREATE vs TRANSFORM determines worker behavior
• Conditional Workers: ln-724 runs ONLY in TRANSFORM mode when platform artifacts detected; SKIP otherwise
• Sequential Workers: Execute in order (ln-724 conditional → ln-721 → ln-722 → ln-723)
• Pre-flight Checks: Verify git status clean, target paths available
• No Data Loss: Copy before delete, verify before removing source (TRANSFORM mode)
• Build Verification: All builds must pass (npm run build, dotnet build)
• Rollback Ready: Keep backup branch until verification complete (TRANSFORM mode)

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Definition of Done

CREATE mode:

• Target stack config received from ln-700
• ln-721 completed: Frontend scaffolded (SCAFFOLD mode)
• ln-722 completed: Backend generated
• ln-723 completed: Seed data generated (GENERATE mode)
• File structure matches target templates
• All configs valid (package.json, tsconfig.json, .csproj)

TRANSFORM mode:

• Current structure analyzed and documented
• Migration plan generated
• ln-724 completed: Platform artifacts removed (if applicable)
• ln-721 completed: Frontend restructured (RESTRUCTURE mode)
• ln-722 completed: Backend generated
• ln-723 completed: Seed data migrated (MIGRATE mode)
• Frontend builds successfully (npm run build)
• Backend builds successfully (dotnet build)
• No orphan files in old locations
• All imports resolve correctly
• Migration report generated

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Risk Mitigation

Risk	Detection	Mitigation
Uncommitted changes	git status not clean	Require clean working directory
Build failure (frontend)	npm run build fails	Rollback, delegate to ln-721 for fix
Build failure (backend)	dotnet build fails	Rollback, delegate to ln-722 for fix
Lost files	Files missing after migration	Restore from backup branch
Import errors	Module not found	Re-run import update phase
Partial migration	Worker fails mid-execution	Atomic: complete all or rollback all
Wrong worker mode	Mode mismatch	Validate mode parameter before delegation

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Reference Files

File	Purpose
references/clean_architecture_dotnet.md	.NET project structure template
references/frontend_structure.md	React project structure template

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Version: 3.0.0 Last Updated: 2026-02-07