### Host inventory manager with Flask: downloadable reports

Deploy a inventory manager built with Flask 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 Flask: 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 inventory manager-specific behavior as your application code.

#### Representative Queries
- Host inventory manager with Flask: downloadable reports
- Where can I host Inventory manager built with Flask?
- I need an export query, generated artifact retention and authorized download flow.

#### Resource Requirements
- primitive:compute
- primitive:postgres
- primitive:s3-compatible-object-storage

#### 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.
- **S3-compatible object storage**: Buckets are S3-compatible with issued credentials; PutObject and GetObject are verified by canary. Other S3 operations are not verified.

#### Workflow Steps
1. **Build and start**: `pip install into .ample/python from requirements.txt`, then `waitress from app.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**: 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.
4. **Deploy**: `ample deploy . --name --public --start "python3 app.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) from the example; then run your own checks.

#### Limitations
- Verified on the python-3.12 template at s-1vcpu-1gb with the example fixture; other sizes, templates and Flask major versions are not verified.
- The inventory manager itself (your export formats, retention policy and entitlement model) is application code and was not separately tested; the pattern checks are what was verified.

#### Cost Estimate
- **Currency**: USD
- **Monthly Amount**: 10.0
- **Components**:
  - App server (size: s-1vcpu-1gb): $5.0
  - Managed PostgreSQL database (size: s-1vcpu-1gb): $5.0

#### Success Checks
1. App responds on its public URL.
2. Generated-downloads self-test.

#### Evidence Summary
- Canary run summary indicating successful deployment and verification of features.

### Prerequisites
- A Flask project that builds and starts with the documented commands.
- A PostgreSQL driver reading DATABASE_URL at runtime.
- A bucket from `ample bucket create` with its credentials passed as encrypted S3_* environment variables.
- An Ample account token with servers:write, databases:read, buckets:read.