### Host project tracker with FastAPI: private attachments

Deploy a project tracker built with FastAPI 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 FastAPI: 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 FastAPI: private attachments
- Where can I host Project tracker built with FastAPI?
- I need attachment metadata, access checks and a tested private object access path.

#### Resource Requirements
- **Compute**
- **Postgres**
- **S3-compatible object storage**

#### Infrastructure Requirements
| Primitive ID                                      | Label                       | Status   | Summary                                                                                          |
|--------------------------------------------------|-----------------------------|----------|--------------------------------------------------------------------------------------------------|
| primitive:compute                                | Compute                     | verified | Apps run in isolated x86_64 Firecracker microVMs that auto-pause when idle and wake on request; sizes are the priced VM sizes.
| primitive:postgres                                | Postgres                    | verified | Managed PostgreSQL 16 runs in its own microVM and is auto-provisioned when an app needs a database and no DATABASE_URL is supplied.
| primitive:s3-compatible-object-storage            | S3-compatible object storage | verified | Buckets are S3-compatible with issued credentials; PutObject and GetObject are verified by canary. Other S3 operations are not verified.

#### Prerequisites
- A FastAPI project that builds and starts with the documented commands (pip install into .ample/python from requirements.txt, then uvicorn from run.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

#### Tested Configuration
- **Template:** python-3.12  
- **Runtime:** python  
- **Size:** s-1vcpu-1gb  
- **Install:** python3 -m pip install --target .ample/python -r requirements.txt  
- **Start:** PYTHONPATH=.ample/python:${PYTHONPATH:-} python3 run.py

#### 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 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.
  
   ```
   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/private-document-library) from the example; then run your own checks. On failure read `ample logs  --kind build` then `--kind runtime`.
  
   ```
   ample logs  --kind build
   ```

#### Limitations
- Verified on the python-3.12 template at s-1vcpu-1gb with the example fixture; other sizes, templates and FastAPI 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:**  
  - **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.

#### Examples
- **FastAPI pattern fixture**  
  - **Description:** Multi-pattern FastAPI app whose private document library module was checked live; the module is under tests/deploy-canaries/_pattern-modules.  
  - **Source Ref:** tests/deploy-canaries/fastapi-patterns

#### Success Checks
- **App responds on its public URL**  
   - **Kind:** http_get  
   - **Path:** /  
   - **Expect:** ample canary fastapi patterns
- **Private-document-library self-test**  
   - **Kind:** http_get  
   - **Path:** /p/private-document-library  
   - **Expect:** private=ok (with ?role=owner; 401 without, 403 for viewer)

#### Evidence Summary
- **Canary Run**  
   - **Summary:** FastAPI pattern fixture deployed on Ample; checks passed for private-document-library and configuration-secrets.   
   - **Observed At:** 2026-09-21T01:14:18Z

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