Implementation Plan: Plugin Architecture & Svelte Web UI

Branch: 001-plugin-arch-svelte-ui | Date: 2025-12-19 | Spec: spec.md Input: Feature specification from specs/001-plugin-arch-svelte-ui/spec.md

Summary

This feature introduces a dual-layer architecture: a Python backend exposing core tools (Backup, Migration, Search) via API, and a Svelte-based Single Page Application (SPA) for user interaction. It also implements a dynamic plugin system allowing developers to extend functionality by adding Python modules to a specific directory without modifying core code.

Technical Context

Language/Version: Python 3.9+ (Backend), Node.js 18+ (Frontend Build) Primary Dependencies:

Backend: Flask or FastAPI [NEEDS CLARIFICATION: Choice of web framework], Pydantic (validation), Plugin loader mechanism (importlib)
Frontend: Svelte, Vite, TailwindCSS (likely for UI) Storage: Filesystem (plugins, logs, backups), SQLite (optional, for job history if needed) Testing: pytest (Backend), vitest/playwright (Frontend) Target Platform: Windows/Linux (Hosted Service) Project Type: Web Application (Backend + Frontend) Performance Goals: UI load < 1s, Log streaming latency < 200ms Constraints: Must run in a hosted environment with ADFS authentication. Scale/Scope: ~5-10 concurrent users, Extensible plugin system.

Constitution Check

GATE: Must pass before Phase 0 research. Re-check after Phase 1 design.

Causal Validity: Do all planned modules have defined Contracts (inputs/outputs/invariants) before implementation logic? (Will be enforced in Phase 1)
Immutability: Are architectural layers and constraints defined in Module Headers? (Will be enforced in Phase 1)
Format Compliance: Does the plan ensure all code will be wrapped in [DEF] anchors? (Will be enforced in Phase 1)
Belief State: Is logging planned to follow the Entry -> Validation -> Action -> Coherence state transition model? (Will be enforced in Phase 1)

Project Structure

Documentation (this feature)

specs/001-plugin-arch-svelte-ui/
├── 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)

backend/
├── src/
│   ├── app.py           # Entry point
│   ├── api/             # REST API endpoints
│   ├── core/            # Plugin loader, Task manager
│   ├── plugins/         # Directory for dynamic plugins
│   └── services/        # Auth (ADFS), Logging
└── tests/

frontend/
├── src/
│   ├── components/      # Reusable UI components
│   ├── pages/           # Route views
│   ├── lib/             # API client, Stores
│   └── App.svelte
└── tests/

superset_tool/           # Existing core logic (refactored to be importable by backend)

Structure Decision: Adopting a standard "Web Application" structure with separated backend and frontend directories to maintain clean separation of concerns. The existing superset_tool library will be preserved and imported by the backend to execute actual tasks.

Complexity Tracking

Violation	Why Needed	Simpler Alternative Rejected Because
N/A

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