# Child Gold Land — Nest API (primary backend)

NestJS API for Child Gold Land (primary backend since G2).

Legacy Fastify `backend/` was removed in G4 (2026-08-01).

## Requirements

- **Node.js:** `^22.18.0` or `>=24.12.0` (`package.json` → `engines`)
- **Pinned for local dev / CI:** `22.18.0` (see `.nvmrc`)

```powershell
nvm install 22.18.0
nvm use 22.18.0
```

After switching Node on a new machine, ensure **better-sqlite3** matches the Node ABI:

```powershell
npm ci
# if load fails: npm rebuild better-sqlite3
```

On Linux CI/runners, native build needs `build-essential` and `python3`.

## Configuration

Copy `.env.example` to `.env` for a new machine. Do not commit `.env`.

| Variable | Local development |
|----------|-------------------|
| `PORT` | `3000` |
| `CORS_ORIGIN` | `http://localhost:5174` (Vite dev server) |
| `DB_PATH` | optional; defaults to `backend-nest/data/app.db` |
| `JWT_SECRET` | dev value in `.env.example`; required in production |

**CI/tests** use temporary SQLite paths or env overrides — never commit or upload `data/app.db`.

## Development (this repo)

```powershell
npm ci
npm run build          # first time or after src changes if not using dev watch
npm run dev            # nest start --watch
# or run compiled:
npm run start
```

- Health: http://127.0.0.1:3000/health
- API prefix: `/api/...`

## Frontend (sibling repo)

Vue app: `gold_land_user` on Gitea — dev http://localhost:5174, proxies `/api` to this backend.

## CI (Gitea Actions)

Workflow: [`.gitea/workflows/ci.yml`](.gitea/workflows/ci.yml) (runs on **push** / **pull_request** when **act_runner** is available — **not verified** on `get.feep.ir` from this repo alone).

### Job **checks**

```powershell
npm ci
npm run type-check
npm run build
npm run test
```

- **Node:** `22.18.0`
- **Env in job:** `NODE_ENV=test`, `JWT_SECRET=ci-test-jwt-not-for-production` (not production secrets)
- **Timeout:** 25 minutes
- **Cache:** npm optional via `actions/setup-node`

### Local equivalent

Same commands as the CI job above. Use a **clean** tree:

```powershell
Remove-Item -Recurse -Force node_modules -ErrorAction SilentlyContinue
npm ci
npm run type-check
npm run build
npm run test
```

### E2E (frontend repo)

Browser E2E lives in **frontend** (`.gitea/workflows/ci.yml` job **e2e**). It clones this repo at a **pinned ref** (`frontend/e2e/backend.contract.json` + optional variable `E2E_BACKEND_REF`). Backend CI does not run Playwright.

### Runner prerequisites

- Node **22.18.0**
- Toolchain for **better-sqlite3** native module on Linux

### Secrets

This workflow needs **no** repository secrets. Frontend E2E may use `E2E_BACKEND_CHECKOUT_TOKEN` to clone this repo if it is private.

### Not yet verified on a real runner

- Workflow execution on `get.feep.ir` with registered **act_runner**
- `npm ci` + full test suite on a clean Linux runner (validated locally in a temp checkout — see stage 7 report)

## Optional: start backend + frontend (Windows)

```powershell
powershell -ExecutionPolicy Bypass -File .\scripts\dev-local-stack.ps1
```

Test ports + temp DB (does not touch `data/app.db`):

```powershell
powershell -ExecutionPolicy Bypass -File .\scripts\dev-local-stack.ps1 -UseTestPorts -SmokeTest
```

## Production

```powershell
npm run build
npm run start
```

Set `NODE_ENV=production` and a strong `JWT_SECRET` via environment or `.env` on the server.

## Tests

Uses **temporary SQLite files only** — not `data/app.db`.

```powershell
npm run test
```

Includes: progression, integration, concurrency, gold-precision, lesson-rewards, dual-connection.

Removed historical `test:cutover:*` scripts — see [docs/cutover-scripts-removed.md](docs/cutover-scripts-removed.md).

## Docker

`docker-compose.yml` in this repo runs backend only. Full stack compose lives in the **frontend** repo.

Trial deploy guide (6 lessons, placeholders, backup, rollback): [../frontend/docs/DEPLOY-TRIAL.md](../frontend/docs/DEPLOY-TRIAL.md) when repos are siblings, or `frontend/docs/DEPLOY-TRIAL.md` in the user repo.

## Backup / restore (SQLite)

WAL-safe backup (not raw copy):

```powershell
$env:DB_PATH = ".\data\app.db"
$env:BACKUP_DIR = ".\backups"
$env:BACKUP_RETENTION_DAYS = "14"
npm run backup:sqlite
npm run restore:sqlite -- backups\app-....db .\restored-trial.db
```

**Live database path:** the script cannot restore directly onto configured `DB_PATH`. Stop the service, restore to a sibling file, swap files, remove stale `-wal`/`-shm`. See [docs/restore-production-db.md](docs/restore-production-db.md). `RESTORE_ACK_STOPPED=YES` is operator acknowledgment only — not a service stop detector.

## Production smoke (local, temp DB)

```powershell
npm run build
npm run smoke:trial-production
```