# Implementation Plan: File Storage Management & UI

**Branch**: `014-file-storage-ui` | **Date**: 2026-01-24 | **Spec**: [specs/014-file-storage-ui/spec.md](../014-file-storage-ui/spec.md)
**Input**: Feature specification from `specs/014-file-storage-ui/spec.md`

## Summary

This feature implements a managed file storage system for dashboard backups and exported repositories. It introduces a configurable storage root (defaulting to outside the workspace) and a Web UI to list, upload, download, and delete files. The system enforces a structured layout with `backups/` and `repositories/` subdirectories to keep artifacts organized. The UI supports hierarchical folder navigation (e.g., `backups/SS2/DashboardName`), allowing users to browse, download, and manage files within nested directories.

## Technical Context

**Language/Version**: Python 3.9+ (Backend), Node.js 18+ (Frontend)
**Primary Dependencies**: FastAPI (Backend), SvelteKit (Frontend)
**Storage**: Local Filesystem (for artifacts), Config (for storage path)
**Testing**: pytest (Backend), vitest/playwright (Frontend - implied)
**Target Platform**: Linux server
**Project Type**: Web application
**Performance Goals**: File list load < 1s for 100 files, supports 50MB+ uploads
**Constraints**: Must prevent path traversal, must not pollute git repo
**Scale/Scope**: ~2-3 backend endpoints, 1-2 frontend pages/components

## Constitution Check

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

- **I. Semantic Protocol Compliance**:
  - **Status**: PASSED
  - **Check**: Will use `[DEF]` anchors and `@RELATION` tags.
  - **Check**: Will follow File Structure Standard.

- **II. Causal Validity (Contracts First)**:
  - **Status**: PASSED
  - **Check**: Contracts will be defined in `specs/014-file-storage-ui/contracts/` before implementation.

- **III. Immutability of Architecture**:
  - **Status**: PASSED
  - **Check**: No changes to immutable architectural constraints expected.

- **IV. Design by Contract (DbC)**:
  - **Status**: PASSED
  - **Check**: Functions will define `@PRE` and `@POST` conditions.

- **V. Belief State Logging**:
  - **Status**: PASSED
  - **Check**: Will use standard logging patterns.

- **VI. Fractal Complexity Limit**:
  - **Status**: PASSED
  - **Check**: Feature scope is small, unlikely to exceed complexity limits.

- **VII. Everything is a Plugin**:
  - **Status**: PASSED
  - **Check**: New functionality will be implemented as a `StoragePlugin` (or similar) inheriting from `PluginBase`.

## Project Structure

### Documentation (this feature)

```text
specs/014-file-storage-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)

```text
backend/
├── src/
│   ├── api/
│   │   └── routes/
│   │       └── storage.py      # New route handler
│   ├── plugins/
│   │   └── storage.py          # New plugin implementation
│   └── models/
│       └── storage.py          # Pydantic models (StoredFile, StorageConfig)
└── tests/
    └── test_storage.py         # Backend tests

frontend/
├── src/
│   ├── routes/
│   │   └── storage/
│   │       └── +page.svelte    # Main storage UI
│   ├── components/
│   │   └── storage/
│   │       ├── FileList.svelte # Component for listing files and folders (explorer view)
│   │       ├── Breadcrumbs.svelte # Component for navigation
│   │       └── FileUpload.svelte # Component for uploading
│   └── services/
│       └── storageService.js   # Frontend API client
```

**Structure Decision**: Standard Web Application structure (Backend + Frontend) with Plugin architecture for the backend logic.

## Complexity Tracking

> **Fill ONLY if Constitution Check has violations that must be justified**

| Violation | Why Needed | Simpler Alternative Rejected Because |
|-----------|------------|-------------------------------------|
| N/A | | |