## Host project tracker with Flask: private attachments

### Summary
Deploy a project tracker built with Flask on Ample using the private document library 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: a role-to-document access model with negative tests (401 without identity, 403 for the wrong role) and a private-bucket round-trip for the allowed role (private=ok). Not separately tested: your identity integration and role assignments; treat the project tracker-specific behavior as your application code.

### Representative Queries
- Host project tracker with Flask: private attachments
- Where can I host Project tracker built with Flask?
- I need attachment metadata, access checks and a tested private object access path.

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

### 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.

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

### Framework
Flask

### Workload
Project tracker

### Release Status
Published

### Support Status
Verified

### Execution Status
Ready

### Prerequisites
- A Flask project that builds and starts with the documented commands (pip install into .ample/python from requirements.txt, then waitress from app.py reading PORT on the python-3.12 template)
- A PostgreSQL driver reading DATABASE_URL at runtime (auto-provisioned when omitted, or supplied with --env)
- 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

### 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**: The fixture's module implements private document library: a role-to-document access model with negative tests (401 without identity, 403 for the wrong role) and a private-bucket round-trip for the allowed role (private=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 (exit 0 live, 1 failed, 2 blocked). Re-running with no change is a no-op.
   - **Command**: 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) (/p/private-document-library) from the example; then run your own checks. On failure read `ample logs  --kind build` then `--kind runtime`.
   - **Command**: ample logs  --kind build

### Success Checks
1. **App responds on its public URL**: 
   - **Kind**: http_get
   - **Path**: /
   - **Expect**: ample canary flask patterns

2. **Private-document-library self-test**: 
   - **Kind**: http_get
   - **Path**: /p/private-document-library
   - **Expect**: private=ok (with ?role=owner; 401 without, 403 for viewer)

### 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 project tracker itself (your identity integration and role assignments) 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
1. **App server**: 
   - **Size**: s-1vcpu-1gb
   - **Quantity**: 1.0
   - **Monthly Amount**: 5.0

2. **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**: Flask pattern fixture deployed on Ample (pip install into .ample/python from requirements.txt, then waitress from app.py reading PORT on the python-3.12 template); checks passed for private-document-library and configuration-secrets. Pattern proof: a role-to-document access model with negative tests (401 without identity, 403 for the wrong role) and a private-bucket round-trip for the allowed role (private=ok).
   - **Observed At**: 2026-09-21T01:14:18Z
   - **Implementation Revision**: 50dbac567d2c5cc8e55e6c748a646be0025d9cfb-dirty (CLI 0.1.21)
   - **Expires At**: 2027-03-20T01:14:18Z

2. **Kind**: canary_run
   - **Summary**: The same Flask app deployed with a --release-command migration; the marker it created was readable after activation.
   - **Observed At**: 2026-09-20T01:54:51Z
   - **Implementation Revision**: 199ff1dfd52683832ae75d3f98b53a7a4bff7f96-dirty (CLI e3181f5)
   - **Expires At**: 2027-03-19T01:54:51Z

### Last Verified At
2026-09-21T01:14:18Z

### Next Actions
1. **Browse the catalog index**: 
   - **Action ID**: browse-catalog
   - **Method**: GET
   - **Relative Path**: /v1/catalog

2. **Search published recipes by intent, stack and constraints**: 
   - **Action ID**: search-recipes
   - **Method**: POST
   - **Relative Path**: /v1/catalog/search
   - **Body**: {"limit":5,"query":"Host project tracker with Flask: private attachments"}

3. **Prepare a side-effect-free deployment plan for an authorized project**: 
   - **Action ID**: plan:page:recipes:project-tracker:flask:private-attachments
   - **Method**: POST
   - **Relative Path**: /v1/catalog/plan
   - **Body**: {"inputs":{},"projectId":"","recipeId":"page:recipes:project-tracker:flask:private-attachments","recipeRevision":"r1"}

4. **Read the existing agent authentication setup**: 
   - **Action ID**: auth-setup
   - **Method**: GET
   - **Relative Path**: /mcp/setup

5. **Browse Project tracker**: 
   - **Action ID**: browse:workload:project-tracker
   - **Method**: GET
   - **Relative Path**: /v1/catalog/nodes/workload%3Aproject-tracker

6. **Browse Flask**: 
   - **Action ID**: browse:stack:framework-flask
   - **Method**: GET
   - **Relative Path**: /v1/catalog/nodes/stack%3Aframework-flask

7. **Browse Private document library**: 
   - **Action ID**: browse:pattern:private-document-library
   - **Method**: GET
   - **Relative Path**: /v1/catalog/nodes/pattern%3Aprivate-document-library

8. **Browse Deploy web app**: 
   - **Action ID**: browse:intent:deploy-web-app
   - **Method**: GET
   - **Relative Path**: /v1/catalog/nodes/intent%3Adeploy-web-app