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+# Agent Context
+
+| Meta | Value |
+|------|-------|
+| **Repo** | `xpltdco/media-rip` |
+| **Language** | Python 3.12 (backend), TypeScript (frontend) |
+| **Framework** | FastAPI + Vue 3 + Vite + Pinia |
+| **Entry Point** | `backend/start.py` → `backend/app/main.py` |
+| **Test Command** | `cd backend && pytest tests/ -v -m "not integration"` |
+| **Build Command** | `docker build -t media-rip .` |
+| **Upstream Port** | `8000` |
+| **Database** | SQLite (aiosqlite) |
+| **Last Updated** | 2026-04-04 |
+
+## File Index
+
+| Priority | File | Purpose |
+|----------|------|---------|
+| 1 | `backend/app/main.py` | FastAPI app + lifespan (full init sequence) |
+| 2 | `backend/app/core/config.py` | Pydantic Settings (env + YAML + defaults) |
+| 3 | `backend/app/core/database.py` | SQLite schema, CRUD, WAL/DELETE detection |
+| 4 | `backend/app/services/download.py` | yt-dlp wrapper, ThreadPoolExecutor, playlist handling |
+| 5 | `backend/app/core/sse_broker.py` | Thread-safe pub/sub for SSE events |
+| 6 | `backend/app/routers/downloads.py` | Download job CRUD endpoints |
+| 7 | `backend/app/routers/sse.py` | EventSource stream endpoint |
+| 8 | `backend/app/routers/admin.py` | Admin panel (auth, settings, purge) |
+| 9 | `backend/app/middleware/session.py` | Cookie session middleware |
+| 10 | `backend/app/services/purge.py` | Scheduled cleanup service |
+| 11 | `backend/app/models/job.py` | Job, JobStatus, FormatInfo models |
+| 12 | `frontend/src/stores/downloads.ts` | Job state management + SSE handlers |
+| 13 | `frontend/src/composables/useSSE.ts` | EventSource lifecycle + reconnect |
+| 14 | `frontend/src/api/client.ts` | Fetch-based API client |
+| 15 | `Dockerfile` | 3-stage multi-arch build |
+
+## Common Modification Patterns
+
+### To add an API endpoint:
+1. Create/edit router in `backend/app/routers/`
+2. Add models in `backend/app/models/`
+3. Register in `backend/app/main.py`
+4. Add frontend call in `frontend/src/api/client.ts`
+
+### To add a database table:
+1. Add CREATE TABLE in `backend/app/core/database.py` `_create_tables()`
+2. Add CRUD functions in same file
+3. Write tests in `backend/tests/`
+
+### To modify download behavior:
+1. Edit `backend/app/services/download.py`
+2. yt-dlp options are built per-job in `_run_download()`
+3. Format extraction in `get_formats()`
+
+## Gotchas
+
+1. **yt-dlp is sync** — runs in ThreadPoolExecutor, never share YoutubeDL instances between threads
+2. **SSE broker threading** — progress hooks run in worker threads, must use `loop.call_soon_threadsafe()` to publish
+3. **Network FS detection** — reads `/proc/mounts` at startup, switches SQLite journal mode accordingly
+4. **Admin password** — plaintext from env var is hashed with bcrypt at startup, then cleared from memory
+5. **Session modes** — `isolated` creates separate queues per browser, `shared` shows all jobs, `open` uses fixed session ID
+6. **Zombie recovery** — on startup, any jobs stuck in queued/downloading are marked failed
+7. **Purge protection** — active jobs (queued/extracting/downloading) are never purged even if past retention
+
+## Verification Commands
+
+```bash
+# Run backend tests
+cd backend && pytest tests/ -v -m "not integration"
+
+# Run frontend tests
+cd frontend && npx vitest run
+
+# Lint
+cd backend && ruff check .
+cd frontend && npx vue-tsc --noEmit
+
+# Docker build
+docker build -t media-rip .
+
+# Health check
+curl http://localhost:8000/api/health
+```
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