# VM Deployment (Flatlogic Executor)

This is how Flatlogic production/preview works: no Docker — PM2 + local PostgreSQL +
Cloudflare tunnel. The end of this document contains a reference **VM file structure**
(executor, pm2, project).

> **Docker deployment** (compose / single-image / staging) is covered in a separate
> document: [`deployment-docker.md`](./deployment-docker.md).

The project consists of two applications:

- `frontend/` — Vite + React + TypeScript (SPA). Build output → `frontend/dist/`.
- `backend/` — Express + Sequelize on TypeScript/ESM. Build output → `backend/dist/`.

The project lives in `~/executor/workspace`, processes are managed by PM2, DB is local
PostgreSQL, external access via Cloudflare tunnel (`cloudflared`). Docker is not used here.

## 1.1. Topology

```
                 Browser
                    │  https://<subdomain>.dev.flatlogic.app
                    ▼
             cloudflared (tunnel)
                    │
                    ▼
               nginx :8080
                    ├── /          → frontend :3001   (Vite)
                    ├── /api        → backend  :3000   (Express)
                    └── /api-docs   → backend  :3000
                                         │
                                         ▼
                              PostgreSQL :5432 (local)
```

- In `NODE_ENV=dev_stage` the backend listens on **3000** (`config.serverPort`), frontend on **3001**.
- The browser opens the tunnel domain; the frontend calls the API via relative path `/api`
  (see `frontend/src/shared/constants/api.ts`), nginx proxies it to the backend —
  same origin, so CORS/CSRF are not a problem.

## 1.2. Environment Variables

**Injected by the platform** into the pm2 environment of the backend process (values are
secrets, not committed to the repository):

| Variable | Purpose |
|---|---|
| `NODE_ENV=dev_stage` | mode (production-like, but without strict production checks) |
| `SECRET_KEY` | JWT signature (required — otherwise backend won't start) |
| `DB_HOST`, `DB_PORT`, `DB_NAME`, `DB_USER`, `DB_PASS` | connection to local Postgres (`DB_PASS` = project UUID) |
| `GOOGLE_CLIENT_ID/SECRET`, `MS_CLIENT_ID/SECRET` | OAuth (optional) |
| `SMTP_*`, `EMAIL_*`, `MAIL_*` | email (optional) |
| `CF_TUNNEL_*` | Cloudflare tunnel (for `cloudflared`, not for the application) |

**From committed `backend/.env`** (not production-level secrets):

- `PORT` (optional, defaults to 8080).
- Seed passwords and DB credentials for development are hardcoded in `shared/constants/app.ts`
  and `seeders/*`; `.env` is only needed for overrides.
- `backend/src/shared/config/load-env.ts` finds `backend/.env` the same way for both `tsx` and
  compiled `dist`.

> `ALLOWED_ORIGINS` is NOT set by the platform. In `dev_stage` this is acceptable: the
> backend doesn't crash and reflects the request origin (`config.auth.allowAllOrigins`).
> Strict `ALLOWED_ORIGINS` check only applies in strict `NODE_ENV=production`.

## 1.3. PM2 Processes

`pm2 status` on the VM shows (names are fixed during provisioning):

| Process | Command (cwd) | Port |
|---|---|---|
| `frontend-dev` | `npm run dev -- --hostname 0.0.0.0 --port 3001` (`workspace/frontend`) | 3001 |
| `backend-dev` | `NODE_ENV=dev_stage npm run start` (`workspace/backend`) | 3000 |
| `fl-executor` | `executor.js` — Flatlogic agent (cable, git, AI commands) | — |
| `fl-telemetry` | `telemetry-daemon.js` | — |

> ⚠️ `--hostname` is a Next.js flag; Vite CLI rejects it (`Unknown option`).
> Therefore `dev`/`start` for the frontend run through the wrapper `frontend/scripts/serve.mjs`,
> which translates `--hostname`→`--host` and starts Vite. Without it, the frontend won't
> start on the VM.

## 1.4. Deployment After `git pull`

PM2 commands **do not install dependencies**. After pulling new code:

```bash
cd ~/executor/workspace/backend  && npm ci
cd ~/executor/workspace/frontend && npm ci
```

The DB schema is created by the initial migration. On an existing DB, `npm run start`
runs `db:migrate` (idempotent, `CREATE TABLE IF NOT EXISTS`) + `db:seed` automatically.
For a guaranteed clean state (recommended after major migrations —
**will delete data**):

```bash
cd ~/executor/workspace/backend && npm run db:reset   # drop all tables → migrate → seed
```

> ⚠️ **On VM**: `npm run db:reset` uses local dev credentials by default, which won't work.
> You must install dependencies and pass the platform-injected DB credentials explicitly:
>
> ```bash
> # 1. Install dependencies first
> cd ~/executor/workspace/backend && npm ci
> cd ~/executor/workspace/frontend && npm ci
>
> # 2. Get DB credentials
> pm2 env 1 | grep DB_PASS              # DB_PASS from PM2 environment
> cat ~/executor/.env | grep DB_        # DB_NAME, DB_USER, DB_HOST, DB_PORT
>
> # 3. Run reset with correct credentials
> cd ~/executor/workspace/backend && \
>   DB_HOST=127.0.0.1 DB_PORT=5432 \
>   DB_NAME=app_<id> DB_USER=app_<id> DB_PASS=<uuid> \
>   npm run db:reset
>
> # 4. Restart PM2 (has platform credentials)
> pm2 restart backend-dev frontend-dev --update-env
> ```

Restart processes (or the executor does this after pull):

```bash
pm2 restart backend-dev frontend-dev --update-env
```

### Scheduled maintenance: refresh-token cleanup

Expired refresh-token rows accumulate (the table is not paranoid). Schedule the
cleanup command (e.g. a daily cron) to delete rows past the retention window
(`AUTH_REFRESH_TOKEN_RETENTION_MS`, default 7 days):

```bash
# crontab -e — daily at 03:30
30 3 * * * cd ~/executor/workspace/backend && npm run db:cleanup-tokens >> ~/token-cleanup.log 2>&1
```

It is idempotent and never touches valid sessions. See
`backend/docs/cookie-auth.md` (Operational maintenance).

### What the Startup Commands Do

- `backend-dev` → `npm run start` = `db:migrate` (initial migration → schema) +
  `db:seed` + `watch` (server via `tsx` + nodemon, port 3000).
- `frontend-dev` → `npm run dev` (via `serve.mjs`) — Vite dev server on 3001,
  `allowedHosts: true` allows the tunnel domain.

## 1.5. nginx

If nginx is a system service, its config should match `nginx.conf` from the
repository (`/` → 3001, `/api` and `/api-docs` → 3000):

```bash
sudo cp ~/executor/workspace/nginx.conf /etc/nginx/nginx.conf
sudo nginx -t && sudo nginx -s reload
```

## 1.6. Verification

```bash
curl -s -o /dev/null -w "front %{http_code}\n" http://127.0.0.1:3001/
curl -s -o /dev/null -w "api   %{http_code}\n" http://127.0.0.1:3000/api-docs/
pm2 status
pm2 logs backend-dev --lines 50
```

## 1.7. Production Mode on VM (Compiled Builds)

"Production mode" = **compiled builds while keeping `NODE_ENV=dev_stage`**
(frontend minification, `node dist` for backend, source maps). Strict `NODE_ENV=production`
cannot be used — it requires `ALLOWED_ORIGINS`, which the platform doesn't set,
and the backend will crash on startup.

To switch to production, change the pm2 commands (on the executor side):

```bash
# Frontend
cd ~/executor/workspace/frontend && npm ci && npm run build
pm2 delete frontend-dev 2>/dev/null || true
FRONT_PORT=3001 pm2 start npm --name frontend --update-env -- run start

# Backend (keep NODE_ENV=dev_stage)
cd ~/executor/workspace/backend && npm ci && npm run build
pm2 delete backend-dev 2>/dev/null || true
NODE_ENV=dev_stage pm2 start npm --name backend --update-env -- run start:production

pm2 save
```

- `frontend npm run start` = `vite preview` on `FRONT_PORT` (3001), serves `dist/`.
- `backend npm run start:production` = `db:migrate:prod` + `db:seed:prod` +
  `node --enable-source-maps dist/index.js` (port 3000).

To have the executor automatically rebuild production on each code update — add
`npm ci && npm run build` to its service restart step (see `vcs.js`, ~line 412,
array `const services = ['backend-dev', 'frontend-dev']`).

## 1.8. Troubleshooting

| Symptom | Cause / Solution |
|---|---|
| Frontend won't start, `Unknown option --hostname` | old code without `serve.mjs`; update workspace (`git pull` + `npm ci`) |
| Backend crashes: `ALLOWED_ORIGINS must be configured` | running with `NODE_ENV=production`; on VM it should be `dev_stage` |
| Backend crashes: `SECRET_KEY` required | platform didn't pass `SECRET_KEY` to pm2-env (required in production/dev_stage) |
| Backend crashes: `Missing required database credentials` | DB_* not set in production/dev_stage (dev defaults don't apply) |
| `tsx: not found` / `vite: not found` | `npm ci` not run after pull |
| 502 on domain | backend/frontend not listening on 3000/3001, or nginx routing mismatch |

---

# Part 2. VM File Structure (Reference)

Snapshot of a production VM (`pool-saas-*`). Useful for understanding where things are located.

## 2.1. Home Directory `~`

```
~/
├── executor/                  # Flatlogic agent + the project itself (see below)
├── .pm2/                      # PM2: processes, logs, pids
│   ├── logs/                  #   *-out.log, *-error.log per process
│   ├── pids/
│   └── dump.pm2               #   saved process list (pm2 save)
├── .bun/ .yarn/ .npm/ .cache/ # toolchains/caches
├── .codex/ .gemini/ .config/  # AI CLI configs
├── .ssh/ .pki/
├── recipes.md
└── google-gemini-cli-0.17.1.tgz
```

## 2.2. `~/executor/` — Flatlogic Agent

```
~/executor/
├── .env                       # agent and project config (PROJECT_UUID, PROJECT_ID,
│                              #   CABLE_URL, DB_NAME=app_<id>, SUBDOMAIN, FRONT_PORT, ...)
├── executor.js               # main agent process (pm2: fl-executor):
│                              #   WebSocket cable to flatlogic.com, receiving commands,
│                              #   launching AI runners (gemini/codex), fs/git operations
├── gemini.js / gemini-proc.js / opencode.js / opencode-proc.js  # AI runners
├── vcs.js  and  vcs/vcs.js   # git: init/pull/push/commit, Gitea mirror,
│                              #   service restart (array ['backend-dev','frontend-dev'])
├── vm-tools.js               # VM tools (commands from platform)
├── activity-tracker.js       # runner activity tracking
├── telemetry-daemon.js / telemetry-server.js / telemetry-file-watcher.js  # telemetry (pm2: fl-telemetry)
├── sentry.js                 # Sentry
├── config.js                 # WORKSPACE_ROOT etc.
├── index.php                 # static preloader page ("Analyzing your requirements...")
├── setup_postgres_project.sh # create role/DB for project in local Postgres
├── setup_mariadb_project.sh  # same for MariaDB
├── setup_workspace_permissions.sh
├── cleanup_vm.sh
├── AGENTS.md / README.md     # instructions for AI agent (describe project template)
├── otel-local.yaml / schema.json / proto/
├── node_modules/  package.json  package-lock.json
├── workspace/                # ◀── THE PROJECT ITSELF (git repository = this repository)
├── workspace_baseline.tar.gz # baseline workspace snapshot
├── workspace_codegen/        # code generation workspace
└── templates/                # templates for new projects
    ├── app-templates/
    └── frontend-tailwind-backend-nodejs/   # Next.js+Node template (NOT our stack)
```

> Files in `executor/` (agent) and `templates/` are not related to running **our** project —
> they don't need to be modified. `index.php` is just a preloader during generation.

## 2.3. `~/executor/workspace/` — The Project

This is the git repository (`40227-vm`):

```
workspace/
├── frontend/      # Vite + React + TS  → builds to frontend/dist, served on :3001
├── backend/       # Express + Sequelize TS/ESM → backend/dist, served on :3000
│   ├── .env       # PORT (committed)
│   └── src/db/migrations/  # initial migration (schema)
├── nginx.conf     # routing / → 3001, /api → 3000 (for system nginx)
├── Dockerfile / Dockerfile.dev / docker/   # alternative Docker path
├── 502.html
└── docs/          # including this file
```

## 2.4. `~/executor/.env` — Keys (Values are Secret/Individual)

```
PROJECT_UUID, PROJECT_ID, CABLE_URL, GEMINI_MODEL, TELEMETRY_*, OTEL_*,
MAIL_*, SMTP_*, SUBDOMAIN, BASE_DOMAIN, FULL_DOMAIN, HOST_FQDN,
DB_NAME=app_<id>, DB_USER=app_<id>, DB_HOST=127.0.0.1, DB_PORT=5432,
FRONT_PORT=3001, SENTRY_DSN
```

Application secrets (`SECRET_KEY`, `DB_PASS`, OAuth/SMTP, git tokens, `CF_TUNNEL_*`)
are placed by the platform directly into the **pm2 environment** of `backend-dev`/`fl-executor`
processes, not in `backend/.env`.
