# Implementation Plan: Backup Scheduler & Unified Task UI

**Branch**: `009-backup-scheduler` | **Date**: 2025-12-30 | **Spec**: [link](spec.md)
**Input**: Feature specification from `/specs/009-backup-scheduler/spec.md`

**Note**: This template is filled in by the `/speckit.plan` command. See `.specify/templates/commands/plan.md` for the execution workflow.

## Summary

Implement a robust backup scheduling system using `APScheduler` and a unified "Tasks" UI in SvelteKit to manage and monitor all background operations (backups, migrations).

## Technical Context

**Language/Version**: Python 3.9+, Node.js 18+
**Primary Dependencies**: FastAPI, APScheduler, SQLAlchemy, SvelteKit, Tailwind CSS
**Storage**: SQLite (`tasks.db`), JSON (`config.json`)
**Testing**: pytest
**Target Platform**: Linux server
**Project Type**: Web application
**Performance Goals**: UI latency < 200ms, Backup trigger < 1s
**Constraints**: Minimal resource footprint for background scheduler
**Scale/Scope**: ~10 environments, ~1000 historical tasks

## Constitution Check

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

- **Library-First**: N/A (Feature integration)
- **CLI Interface**: N/A (Web UI focus)
- **Test-First**: Mandatory for Scheduler logic and API endpoints. PASS.
- **Integration Testing**: Required for Scheduler -> TaskManager interaction. PASS.

**Result**: PASS

## Project Structure

### Documentation (this feature)

```text
specs/009-backup-scheduler/
├── plan.md              # This file (/speckit.plan command output)
├── research.md          # Phase 0 output (/speckit.plan command)
├── data-model.md        # Phase 1 output (/speckit.plan command)
├── quickstart.md        # Phase 1 output (/speckit.plan command)
├── contracts/           # Phase 1 output (/speckit.plan command)
└── tasks.md             # Phase 2 output (/speckit.tasks command - NOT created by /speckit.plan)
```

### Source Code (repository root)

```text
backend/
├── src/
│   ├── api/
│   │   └── routes/
│   │       └── tasks.py        # NEW: Task management endpoints
│   ├── core/
│   │   ├── scheduler.py        # NEW: APScheduler integration
│   │   └── task_manager/       # EXISTING: Updates for DB persistence
│   ├── models/
│   │   └── task.py             # NEW: SQLAlchemy model
│   └── services/
└── tests/

frontend/
├── src/
│   ├── components/
│   │   └── TaskList.svelte     # NEW: Task display component
│   │   └── TaskLogViewer.svelte # NEW: Detailed log view
│   ├── routes/
│   │   └── tasks/              # NEW: Tasks page
│   │       └── +page.svelte
│   └── types/
```

**Structure Decision**: Standard FastAPI + SvelteKit structure.

## Complexity Tracking

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

| Violation | Why Needed | Simpler Alternative Rejected Because |
|-----------|------------|-------------------------------------|
| | | |