001-migration-ui-redesign (#3)

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# Implementation Plan: Migration Process and UI Redesign
**Branch**: `001-migration-ui-redesign` | **Date**: 2025-12-20 | **Spec**: [specs/001-migration-ui-redesign/spec.md](specs/001-migration-ui-redesign/spec.md)
## Summary
Redesign the migration process to support environment-based selection and automated database mapping. The technical approach involves using a SQLite database to persist mappings between source and target databases, implementing a fuzzy matching algorithm for empirical suggestions, and intercepting asset definitions during migration to apply these mappings.
## Technical Context
**Language/Version**: Python 3.9+, Node.js 18+
**Primary Dependencies**: FastAPI, SvelteKit, Tailwind CSS, Pydantic, SQLite
**Storage**: SQLite (for database mappings and environment metadata)
**Testing**: pytest (Backend), Vitest/Playwright (Frontend)
**Target Platform**: Linux server
**Project Type**: Web application (FastAPI + SvelteKit SPA)
**Performance Goals**: SC-001: Users can complete a full database mapping for 5+ databases in under 60 seconds.
**Constraints**: SPA-First Architecture (Constitution Principle I), API-Driven Communication (Constitution Principle II).
**Scale/Scope**: Support for multiple environments and hundreds of database mappings.
## Constitution Check
*GATE: Must pass before Phase 0 research. Re-check after Phase 1 design.*
| Principle | Status | Notes |
|-----------|--------|-------|
| I. SPA-First Architecture | PASS | SvelteKit will be built as a static SPA and served by FastAPI. |
| II. API-Driven Communication | PASS | All mapping and migration actions will go through FastAPI endpoints. |
| III. Modern Stack Consistency | PASS | Using FastAPI, SvelteKit, and Tailwind CSS. |
| IV. Semantic Protocol Adherence | PASS | Code will include GRACE-Poly anchors and contracts. |
## Project Structure
### Documentation (this feature)
```text
specs/001-migration-ui-redesign/
├── plan.md # This file
├── research.md # Phase 0 output
├── data-model.md # Phase 1 output
├── quickstart.md # Phase 1 output
├── contracts/ # Phase 1 output
└── tasks.md # Phase 2 output
```
### Source Code (repository root)
```text
backend/
├── src/
│ ├── api/
│ │ └── routes/
│ │ ├── environments.py # New: Env selection
│ │ └── mappings.py # New: DB mapping management
│ ├── core/
│ │ └── migration_engine.py # Update: DB replacement logic
│ └── models/
│ └── mapping.py # New: SQLite models
└── tests/
frontend/
├── src/
│ ├── components/
│ │ ├── MappingTable.svelte # New: DB mapping UI
│ │ └── EnvSelector.svelte # New: Source/Target selection
│ └── routes/
│ └── migration/ # New: Migration dashboard
└── tests/
```
**Structure Decision**: Web application structure (Option 2) is selected to maintain separation between the FastAPI backend and SvelteKit frontend while adhering to the SPA-first principle.
## Complexity Tracking
> **Fill ONLY if Constitution Check has violations that must be justified**
| Violation | Why Needed | Simpler Alternative Rejected Because |
|-----------|------------|-------------------------------------|
| None | N/A | N/A |