# Host graphql api with NestJS: Postgres-backed state

Deploy a graphql api built with NestJS on Ample using the durable job state pattern. Compute runs the app in an isolated microVM behind a public HTTPS URL, a managed PostgreSQL 16 database is auto-provisioned and injected as DATABASE_URL. Verified on NestJS: a jobs table with a state and attempts counter, processing inside a row-locked transaction, and a second run that is a no-op (job=done attempts=1 idempotent=true). Not separately tested: your job types, payload schema and retry policy; treat the graphql api-specific behavior as your application code.

## Prerequisites
- A NestJS project that builds and starts with the documented commands (npm install, nest build (TypeScript) then node dist/main.js on the node-22 template)
- A PostgreSQL driver reading DATABASE_URL at runtime (auto-provisioned when omitted, or supplied with --env)
- An Ample account token with servers:write, databases:read

## Infrastructure Requirements
- **Compute**: Apps run in isolated x86_64 Firecracker microVMs that auto-pause when idle and wake on request; sizes are the priced VM sizes.
- **Postgres**: Managed PostgreSQL 16 runs in its own microVM and is auto-provisioned when an app needs a database and no DATABASE_URL is supplied.

## Workflow Steps
1. **Build and start**  
npm install, nest build (TypeScript) then node dist/main.js on the node-22 template. The server must bind 0.0.0.0 on PORT.
2. **Implement the pattern on PostgreSQL**  
The fixture's module implements durable job state: a jobs table with a state and attempts counter, processing inside a row-locked transaction, and a second run that is a no-op (job=done attempts=1 idempotent=true). Copy the approach into your schema; keep migrations idempotent and run them with --release-command.
3. **Deploy**  
Run the synchronous deploy once and read the result (exit 0 live, 1 failed, 2 blocked). Re-running with no change is a no-op.  
Command: `ample deploy . --name <name> --public`
4. **Verify**  
Fetch the live URL and the pattern self-test route(s) (/p/durable-job-state) from the example; then run your own checks. On failure read `ample logs <deploy_id> --kind build` then `--kind runtime`.  
Command: `ample logs --kind build`

## Limitations
- Verified on the node-22 template at s-1vcpu-1gb with the example fixture; other sizes, templates and NestJS major versions are not verified.
- The graphql api itself (your job types, payload schema and retry policy) is application code and was not separately tested; the pattern checks are what was verified.
- Region, compliance attestations and request-duration limits are unknown and not claimed.

## Success Checks
- **app responds on its public URL**  
Kind: http_get  
Path: /  
Expect: ample canary nestjs patterns
- **durable-job-state self-test**  
Kind: http_get  
Path: /p/durable-job-state  
Expect: job=done attempts=1 idempotent=true

## 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
Always-on monthly price of the tested sizes; apps and databases auto-pause when idle. Buckets are allocation-priced per quota and not included.

## Evidence Summary
- **Canary Run**: NestJS pattern fixture deployed on Ample; checks passed for durable-job-state and configuration-secrets. 
- **Observed At**: 2026-09-21T02:34:39Z  
- **Implementation Revision**: 1d28ae0-dirty

## Examples
- **Title**: NestJS pattern fixture  
**Description**: Multi-pattern NestJS app whose durable job state module was checked live; the module is under tests/deploy-canaries/_pattern-modules.  
**Source Ref**: tests/deploy-canaries/nestjs-patterns

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