# Backup and Restore

Each site owns its own data (single-tenant, ADR-004), so backups are the site's
responsibility. A complete backup is two parts:

1. **The MySQL database** - all asset, user, audit, and settings data.
2. **The `instance/` directory** - uploaded floor plans, branding assets,
   `plugins.json` (the enabled-plugin list), and any tokens or files the app
   writes to disk. These are NOT in the database, so a DB-only backup loses
   them. Back up `instance/` alongside every database dump.

Restoring the database without the matching `instance/` directory leaves the
app pointing at floor plans and logos that no longer exist.

## What to back up

| Item | Location | Why |
|------|----------|-----|
| Database | MySQL `shopdb_flask` | All application data. |
| `instance/branding/` | repo `instance/` dir | Uploaded logos and favicon. |
| `instance/` floor plans | repo `instance/` dir | Uploaded map blueprints. |
| `instance/plugins.json` | repo `instance/` dir | Which plugins this site enabled. |
| `.env` | repo root (offline, secured) | Secrets needed to bring the stack back up. Store separately from the data backup, in a secrets manager. |

## Backup

### Database (Docker)

```bash
docker compose exec -T db mysqldump \
  -u root -p"${MYSQL_ROOT_PASSWORD}" \
  --single-transaction --routines --triggers \
  shopdb_flask | gzip > shopdb-$(date +%F).sql.gz
```

`--single-transaction` gives a consistent dump without locking the tables (InnoDB).

### Database (external MySQL, no container)

```bash
mysqldump -h <host> -u <user> -p \
  --single-transaction --routines --triggers \
  shopdb_flask | gzip > shopdb-$(date +%F).sql.gz
```

### instance directory

```bash
tar czf instance-$(date +%F).tar.gz instance/
```

Recommended cadence: nightly database dump to offsite storage, 14-day
retention; `instance/` captured on the same schedule (and always right before an
upgrade). Verify a restore quarterly.

## Restore

Restoring replaces the current database contents. Do it into a known-empty or a
throwaway target first if you are unsure.

### Step 1: Bring up the stack (or a fresh one)

```bash
cp .env.example .env   # or restore your saved .env
# ensure MYSQL_* and DATABASE_URL match the dump's database name (shopdb_flask)
docker compose up -d db
```

Wait for the `db` container to report healthy (`docker compose ps`).

### Step 2: Load the database dump

```bash
gunzip -c shopdb-2026-07-10.sql.gz | \
  docker compose exec -T db mysql -u root -p"${MYSQL_ROOT_PASSWORD}" shopdb_flask
```

For an external MySQL:

```bash
gunzip -c shopdb-2026-07-10.sql.gz | mysql -h <host> -u <user> -p shopdb_flask
```

If the target database does not exist yet, create it as utf8mb4 first (matching
the schema charset):

```sql
CREATE DATABASE shopdb_flask CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
```

### Step 3: Restore the instance directory

```bash
tar xzf instance-2026-07-10.tar.gz    # restores ./instance/
```

The docker-compose api container reads `instance/` from the repo working
directory; make sure it is present before starting `api`.

### Step 4: Bring up the API and reconcile migrations

```bash
docker compose up -d api
docker compose exec api flask db upgrade
```

`flask db upgrade` is a safety net: if the dump predates the current code, this
applies any newer migrations. If the dump is at the same version it is a no-op.

### Step 5: Verify

- Log in with a known account.
- Confirm the floor map renders (branding and map blueprints resolve from
  `instance/`).
- Spot-check a few asset records and the audit log.
- `curl -s -X POST -H "Content-Type: application/json" -d '{}' http://localhost:5001/api/auth/login | jq .`
  should return a `VALIDATION_ERROR`, not a 500.

## See also

- [DEPLOY.md](DEPLOY.md) - first-time deploy
- [UPGRADE.md](UPGRADE.md) - upgrade procedure (back up first)
- [CONFIG.md](CONFIG.md) - environment variables and Setting keys