# Host graphql api with Starlette: stored input and output artifacts

Deploy a graphql api built with Starlette on Ample using the generated downloads 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, a private S3-compatible bucket holds objects with credentials delivered as encrypted environment variables. Verified on Starlette: an export query rendered to a CSV artifact stored with metadata in a private bucket and returned only to an authorized caller (401 without token, export=ok rows=3). Not separately tested: your export formats, retention policy and entitlement model; treat the graphql api-specific behavior as your application code.

## Representative Queries

- Host graphql api with Starlette: stored input and output artifacts
- Where can I host GraphQL API built with Starlette?
- I need an input/output artifact contract, object metadata and access boundaries.

## Resource Requirements

- primitive:compute
- primitive:postgres
- primitive:s3-compatible-object-storage

## Workflow Steps

1. **Build and start**  
   pip install into .ample/python from requirements.txt, then uvicorn from run.py reading PORT on the python-3.12 template. The server must bind 0.0.0.0 on PORT.

2. **Implement the pattern on PostgreSQL**  
   The fixture's module implements generated downloads: an export query rendered to a CSV artifact stored with metadata in a private bucket and returned only to an authorized caller (401 without token, export=ok rows=3). Copy the approach into your schema; keep migrations idempotent and run them with --release-command.

3. **Wire object storage**  
   Create the bucket(s), then pass endpoint, region, bucket and keys as --env values. Use path-style addressing. Keep private data in an unpublished bucket.

4. **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 --start "python3 run.py" --env S3_ENDPOINT=... --env S3_REGION=... --env S3_BUCKET=... --env S3_ACCESS_KEY_ID=... --env S3_SECRET_ACCESS_KEY=...`

5. **Verify**  
   Fetch the live URL and the pattern self-test route(s) (/p/generated-downloads) from the example; then run your own checks. On failure read `ample logs  --kind build` then `--kind runtime`.  
   Command: `ample logs  --kind build`

## Limitations

- Verified on the python-3.12 template at s-1vcpu-1gb with the example fixture; other sizes, templates and Starlette major versions are not verified.
- The graphql api itself (your export formats, retention policy and entitlement model) 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.
- PutObject and GetObject with path-style addressing are verified; multipart upload, listing, presigned URLs and lifecycle rules are not.

## 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, monthlyAmount 5.0  
  - managed PostgreSQL database: size s-1vcpu-1gb, quantity 1.0, monthlyAmount 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**  
  Starlette pattern fixture deployed on Ample (pip install into .ample/python from requirements.txt, then uvicorn from run.py reading PORT on the python-3.12 template); checks passed for generated-downloads and configuration-secrets. Pattern proof: an export query rendered to a CSV artifact stored with metadata in a private bucket and returned only to an authorized caller (401 without token, export=ok rows=3).  
  Observed At: 2026-09-21T01:21:36Z  
  Implementation Revision: 50dbac567d2c5cc8e55e6c748a646be0025d9cfb-dirty (CLI 0.1.21)  
  Expires At: 2027-03-20T01:21:36Z

- **Canary Run**  
  The same Starlette app deployed with a --release-command migration; the marker it created was readable after activation.  
  Observed At: 2026-09-20T02:16:51Z  
  Implementation Revision: 199ff1dfd52683832ae75d3f98b53a7a4bff7f96-dirty (CLI e3181f5)  
  Expires At: 2027-03-19T02:16:51Z

## Next Actions

- **Browse the catalog index**: relativePath: `/v1/catalog`
- **Search published recipes by intent, stack and constraints**: relativePath: `/v1/catalog/search`
- **Prepare a side-effect-free deployment plan for an authorized project**: relativePath: `/v1/catalog/plan`
- **Read the existing agent authentication setup**: relativePath: `/mcp/setup`
- **Browse GraphQL API**: relativePath: `/v1/catalog/nodes/workload%3Agraphql-api`
- **Browse Starlette**: relativePath: `/v1/catalog/nodes/stack%3Aframework-starlette`
- **Browse Generated downloads**: relativePath: `/v1/catalog/nodes/pattern%3Agenerated-downloads`
- **Browse Deploy API**: relativePath: `/v1/catalog/nodes/intent%3Adeploy-api`