## Host MCP Server with Fastify: Postgres-backed State

### Summary
Deploy a MCP server built with Fastify 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 Fastify: 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 MCP server-specific behavior as your application code.

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

### Resource Requirements
- Primitive: Compute
- Primitive: Postgres

### Framework
Fastify

### Workload
MCP server

### Release Status
Published

### Support Status
Verified

### Execution Status
Ready

### Prerequisites
1. A Fastify project that builds and starts with the documented commands (npm install, npm run build --if-present, npm run start on the node-22 template).
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**: node-22
- **Runtime**: node
- **Size**: s-1vcpu-1gb
- **Install**: npm install
- **Build**: npm run build --if-present
- **Start**: npm run start

### Workflow Steps
1. **Build and Start**: `npm install, npm run build --if-present, npm run start` 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 <project> --kind build` then `--kind runtime`. Command: `ample logs <project> --kind build`

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

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

### Limitations
- Verified on the node-22 template at s-1vcpu-1gb with the example fixture; other sizes, templates and Fastify major versions are not verified.
- The MCP server 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.
- 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 databases are placed together.

### Cost Estimate
- **Currency**: USD
- **Monthly Amount**: 10.00
- **Authority**: true
- **Basis**: size prices from pricing.toml.
- **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.

### Evidence Summary
- **Kind**: canary_run
  - **Summary**: Fastify pattern fixture deployed on Ample; checks passed for durable-job-state and configuration-secrets.
  - **Observed At**: 2026-09-21T01:14:18Z
  - **Implementation Revision**: 50dbac567d2c5cc8e55e6c748a646be0025d9cfb-dirty.

### Next Actions
1. **Browse the Catalog Index**: Action ID: browse-catalog
2. **Search published recipes by intent**: Action ID: search-recipes
3. **Prepare a side-effect-free deployment plan for an authorized project**: Action ID: plan:page:recipes:mcp-server:fastify:persistent-state
4. **Read the existing agent authentication setup**: Action ID: auth-setup
5. **Browse MCP server**: Action ID: browse:workload:mcp-server
6. **Browse Fastify**: Action ID: browse:stack:framework-fastify
7. **Browse Durable job state**: Action ID: browse:pattern:durable-job-state
8. **Browse Deploy MCP server**: Action ID: browse:intent:deploy-mcp-server.