## Host form collection with FastAPI: structured data imports

Deploy a form collection built with FastAPI on Ample using the bulk import staging 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 FastAPI: a CSV staged as an object, row-level validation with per-row errors recorded, and a restart-safe import keyed by import id (imported=2 rejected=1 restart=ok). Not separately tested: your import format, mapping and conflict rules; treat the form collection-specific behavior as your application code.

### Representative Queries
- Host form collection with FastAPI: structured data imports
- Where can I host Form collection built with FastAPI?
- I need a workload-specific import mapping, conflict rules and restart behavior.

### Parent Resources
- **Form collection:** [View](/content/discover/workload/form-collection/index.html)
- **FastAPI:** [View](/content/discover/stack/framework-fastapi/index.html)
- **Bulk import staging:** [View](/content/discover/pattern/bulk-import-staging/index.html)
- **Deploy web app:** [View](/content/discover/intent/deploy-web-app/index.html)

### Resource Requirements
- **Compute**: Apps run in isolated x86_64 Firecracker microVMs.
- **Postgres**: Managed PostgreSQL 16 runs in its own microVM.
- **S3-compatible object storage**: Buckets are S3-compatible with issued credentials.

### 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 bulk import staging: a CSV staged as an object, row-level validation with per-row errors recorded, and a restart-safe import keyed by import id (imported=2 rejected=1 restart=ok). 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 Keep private data in an unpublished bucket.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. Re-running with no change is a no-op.
5. **Verify**: Fetch the live URL and the pattern self-test route(s); then run your own checks. On failure, read logs.

### Examples
- **FastAPI pattern fixture**: Multi-pattern FastAPI app whose bulk import staging module was checked live.

### Success Checks
- App responds on its public URL
- Bulk-import-staging self-test

### Limitations
- Verified on the python-3.12 template at s-1vcpu-1gb.

### Cost Estimate
- **Monthly Cost**: $10
  - App server s-1vcpu-1gb: $5
  - Managed PostgreSQL database s-1vcpu-1gb: $5