# Connect Postgres for Fastify

Connect a Fastify app to PostgreSQL on Ample. Read DATABASE_URL at runtime with pg: when you supply one with --env it is delivered encrypted and takes precedence; when you supply none and the app needs PostgreSQL, Ample auto-provisions a managed PostgreSQL 16 database and injects its connection string.

## Prerequisites
- pg reading the DATABASE_URL environment variable at runtime
- Either a production DATABASE_URL to pass with --env, or nothing (auto-provision)
- An Ample account token with servers:write and databases:read

## Workflow Steps
1. **Read the URL at runtime**  
   Open connections from the DATABASE_URL environment variable inside the app; never commit credentials and never connect at build time.

2. **Choose the source of the database**  
   Pass --env DATABASE_URL=... for an existing database, or omit it to let Ample provision a managed one on first deploy and reuse it on redeploys.  
   Command: `ample deploy . --name  --public`

3. **Test the connection through the app**  
   Expose a route (/items) that runs a trivial query and returns postgres=ok.

4. **Verify**  
   Fetch the live URL and run the success checks below. On failure read the build log, then the runtime log, fix the cause and deploy again; do not blind-retry.  
   Command: `ample logs  --kind build`

## Examples
- **Fastify + PostgreSQL canary**  
  Auto-provisioned managed database with a real query.  
  Source Ref: `tests/deploy-canaries/fastify-postgres-api`

## Success Checks
- Database route reports a live connection  
  Kind: `http_get`  
  Path: `/items`  
  Expect: `postgres=ok`

## Limitations
- Verified on the node-22 template at s-1vcpu-1gb; other templates and sizes are not verified by this recipe.
- Region, compliance attestations and request-duration limits are unknown and not claimed.
- Apps auto-pause when idle and wake on the next request; always-on is an operator setting, not a plan feature.
- Managed PostgreSQL 16 only; extensions, connection limits and backup or restore procedures are not verified.
- Apps and their managed databases are placed together; cross-node shared databases are unsupported.

## Cost Estimate
- **Currency**: USD
- **Monthly Amount**: 10.0
- **Basis**: size prices from pricing.toml (loaded by the API) at build revision 1ac5595375130d45290090e82ed0f554ccd45405-dirty
- **Components**:
  - App server:  
    Size: `s-1vcpu-1gb`  
    Quantity: 1.0  
    Monthly Amount: 5.0
  - Managed PostgreSQL database:  
    Size: `s-1vcpu-1gb`  
    Quantity: 1.0  
    Monthly Amount: 5.0
- **Note**: Apps and managed databases auto-pause when idle; the estimate is the always-on monthly price of the tested sizes. Plan quotas and budgets apply.