## Host GraphQL API with Axum: Postgres-backed state

### Summary
Deploy a GraphQL API built with Axum on Ample using the durable job state pattern. Compute runs the app in an isolated microVM behind a public HTTPS URL, and a managed PostgreSQL 16 database is auto-provisioned and injected as DATABASE_URL. Verified on Axum: 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.

### Representative Queries
- Host GraphQL API with Axum: Postgres-backed state
- Where can I host GraphQL API built with Axum?
- I need a durable state schema and retry/recovery semantics implemented by application code.

### Resource Requirements
- Compute
- Postgres

### 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.

### Framework
Axum

### Workload
GraphQL API

### Release Status
Published

### Support Status
Verified

### Execution Status
Ready

### Prerequisites
1. An Axum project that builds and starts with the documented commands (cargo build --release in the rust builder image (stable toolchain, Cargo.lock committed, pure-Rust dependencies), then the release binary on the ubuntu-24.04 template reading PORT and DATABASE_URL).
2. A PostgreSQL driver reading DATABASE_URL at runtime (auto-provisioned when omitted or supplied with --env).
3. An Ample account token with servers:write, databases:read.

### Tested Configuration
- **Template**: ubuntu-24.04
- **Runtime**: rust
- **Size**: s-1vcpu-2gb
- **Build**: cargo build --release
- **Start**: ./$(ls target/release/*.d | grep -v '/lib' | head -n 1 | sed 's/\.d$//')

### Workflow Steps
1. **Build and start**: `cargo build --release` in the rust builder image.
2. **Implement the pattern on PostgreSQL**: Ensure durable job state with a jobs table and state counter.
3. **Deploy**: Run the synchronous deploy once and read the result.
   - Command: `ample deploy . --name  --public`
4. **Verify**: Fetch the live URL and pattern self-test route(s) and run checks.
   - Command: `ample logs  --kind build`

### Examples
- **Axum pattern fixture**: Multi-pattern Axum app whose durable job state module was checked live.

### Success Checks
1. App responds on its public URL
   - Kind: http_get
   - Path: /
   - Expect: ample canary axum patterns
2. Durable-job-state self-test
   - Kind: http_get
   - Path: /p/durable-job-state
   - Expect: job=done attempts=1 idempotent=true

### Limitations
- Verified only on the ubuntu-24.04 template. Other sizes, templates, and Axum major versions are not verified.
- The GraphQL API behavior is application-specific and has not been tested separately.

### Cost Estimate
- **Monthly Amount**: $10.00
- **Note**: Always-on monthly price for tested sizes. Apps and databases auto-pause when idle.

### Evidence Summary
- **Canary Run**: Axum pattern fixture deployed, checks passed for durable-job-state and configuration-secrets.

### Unknowns
- Region availability and compliance attestations are unknown until verified facts are recorded.

### Formats
- **HTML**: [Ample recipe](/content/recipes/graphql-api/axum/persistent-state/index.html)
- **Markdown**: [Markdown version](/content/recipes/graphql-api/axum/persistent-state.md) 
- **JSON**: [API version](https://api.ample.computer/v1/catalog/recipes/page%3Arecipes%3Agraphql-api%3Aaxum%3Apersistent-state)