# Host graphql api with Gin: Postgres-backed state

Deploy a graphql api built with Gin 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 Gin: 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 Gin: Postgres-backed state
- Where can I host GraphQL API built with Gin?
- I need a durable state schema and retry/recovery semantics implemented by application code.

## Resource Requirements
- **Primitive: compute**
- **Primitive: postgres**

## Infrastructure Requirements

1. **Compute**
   - Status: verified
   - Summary: Apps run in isolated x86_64 Firecracker microVMs that auto-pause when idle and wake on request; sizes are the priced VM sizes.

2. **Postgres**
   - Status: verified
   - Summary: Managed PostgreSQL 16 runs in its own microVM and is auto-provisioned when an app needs a database and no DATABASE_URL is supplied.

## Execution Status
- Status: ready
- Docs Only: false

## Prerequisites
- A Gin project that builds and starts with the documented commands (CGO_ENABLED=0 go build -o app ./... then ./app on the ubuntu-24.04 template (go.sum committed for a reproducible build))
- 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

## Workflow Steps
1. **Build and start**  
   CGO_ENABLED=0 go build -o app ./... then ./app on the ubuntu-24.04 template (go.sum committed for a reproducible build). 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  --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  --kind build` then `--kind runtime`.  
   Command: ample logs  --kind build

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

## Limitations
- Verified on the ubuntu-24.04 template at s-1vcpu-1gb with the example fixture; other sizes, templates and Gin 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.
- 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**: 10.0
- **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
1. **Kind**: canary_run  
   - **Summary**: Gin pattern fixture deployed on Ample (CGO_ENABLED=0 go build -o app ./... then ./app on the ubuntu-24.04 template (go.sum committed for a reproducible build)); checks passed for durable-job-state and configuration-secrets. Pattern proof: 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).
   - **Observed At**: 2026-09-21T01:15:54Z  
   - **Implementation Revision**: 50dbac567d2c5cc8e55e6c748a646be0025d9cfb-dirty (CLI 0.1.21)  
   - **Expires At**: 2027-03-20T01:15:54Z  
   - **Scope**: {"checks":["/p/durable-job-state"],"pattern":"pattern:durable-job-state","template":"ubuntu-24.04"}

2. **Kind**: canary_run  
   - **Summary**: The same Gin app deployed with a --release-command migration; the marker it created was readable after activation.  
   - **Observed At**: 2026-09-20T02:43:30Z  
   - **Implementation Revision**: 199ff1dfd52683832ae75d3f98b53a7a4bff7f96-dirty (CLI b75e104)  
   - **Expires At**: 2027-03-19T02:43:30Z  
   - **Scope**: {"pattern":"pattern:durable-job-state"}

## Last Verified At
- 2026-09-21T01:15:54Z

## Unknowns
- Region availability is unknown until a verified region fact is recorded.
- Compliance attestations are unknown; none are claimed.

## Formats
- **HTML**: https://ample.computer/recipes/graphql-api/gin/persistent-state  
- **Markdown**: https://ample.computer/recipes/graphql-api/gin/persistent-state.md  
- **JSON**: https://api.ample.computer/v1/catalog/recipes/page%3Arecipes%3Agraphql-api%3Agin%3Apersistent-state

## Next Actions
1. **Action ID**: browse-catalog  
   - **Label**: Browse the catalog index  
   - **Method**: GET  
   - **Path**: /v1/catalog
   - **Requires Authentication**: No

2. **Action ID**: search-recipes  
   - **Label**: Search published recipes by intent, stack and constraints  
   - **Method**: POST  
   - **Path**: /v1/catalog/search  
   - **Requires Authentication**: No

3. **Action ID**: plan:page:recipes:graphql-api:gin:persistent-state  
   - **Label**: Prepare a side-effect-free deployment plan for an authorized project  
   - **Method**: POST  
   - **Path**: /v1/catalog/plan  
   - **Requires Authentication**: Yes

4. **Action ID**: auth-setup  
   - **Label**: Read the existing agent authentication setup  
   - **Method**: GET  
   - **Path**: /mcp/setup  
   - **Requires Authentication**: No

5. **Action ID**: browse:workload:graphql-api  
   - **Label**: Browse GraphQL API  
   - **Method**: GET  
   - **Path**: /v1/catalog/nodes/workload%3Agraphql-api  
   - **Requires Authentication**: No

6. **Action ID**: browse:stack:framework-gin  
   - **Label**: Browse Gin  
   - **Method**: GET  
   - **Path**: /v1/catalog/nodes/stack%3Aframework-gin  
   - **Requires Authentication**: No

7. **Action ID**: browse:pattern:durable-job-state  
   - **Label**: Browse Durable job state  
   - **Method**: GET  
   - **Path**: /v1/catalog/nodes/pattern%3Adurable-job-state  
   - **Requires Authentication**: No

8. **Action ID**: browse:intent:deploy-api  
   - **Label**: Browse Deploy API  
   - **Method**: GET  
   - **Path**: /v1/catalog/nodes/intent%3Adeploy-api  
   - **Requires Authentication**: No