## Host recruiting tracker with Phoenix: private attachments

### Summary
Deploy a recruiting tracker built with Phoenix 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 Phoenix: 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 recruiting tracker-specific behavior as your application code.

### Representative Queries
- Host recruiting tracker with Phoenix: private attachments
- Where can I host Recruiting tracker built with Phoenix?
- 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
#### 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.

#### 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.

#### 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.

### Prerequisites
- A Phoenix project that builds and starts with the documented commands (mix deps.get, MIX_ENV=prod mix compile and mix release in the builder, then the release bin script with PHX_SERVER=true on the elixir-1.18 template; PORT, DATABASE_URL and SECRET_KEY_BASE read in config/runtime.exs)
- 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**  
   mix deps.get, MIX_ENV=prod mix compile and mix release in the builder, then the release bin script with PHX_SERVER=true on the elixir-1.18 template; PORT, DATABASE_URL and SECRET_KEY_BASE read in config/runtime.exs. 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 --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

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

### Success Checks
- **Description:** app responds on its public URL  
  **Kind:** http_get  
  **Path:** /  
  **Expect:** ample canary phoenix patterns
- **Description:** 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 elixir-1.18 template at s-1vcpu-1gb with the example fixture; other sizes, templates and Phoenix major versions are not verified.
- The recruiting 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 verified.

### Cost Estimate
- **Currency:** USD  
- **Monthly Amount:** 10.0  
- **Basis:** size prices from pricing.toml (loaded by the API) at build revision 1ac5595375130d45290090e82ed0f554ccd45405-dirty  
- **Components:**  
  - **Name:** app server  
    - **Size:** s-1vcpu-1gb  
    - **Quantity:** 1.0  
    - **Monthly Amount:** 5.0  
  - **Name:** 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
- **Kind:** canary_run  
  **Summary:** Phoenix pattern fixture deployed on Ample (mix deps.get, MIX_ENV=prod mix compile and mix release in the builder, then the release bin script with PHX_SERVER=true on the elixir-1.18 template; PORT, DATABASE_URL and SECRET_KEY_BASE read in config/runtime.exs); 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:** 2026-09-20T23:45:31Z  
  **Implementation Revision:** 4d1511e574302f3904b75088bd4048a0975218b3-dirty (CLI 0.1.21)  
  **Expires At:** 2027-03-19T23:45:31Z

- **Kind:** canary_run  
  **Summary:** The same Phoenix app deployed with a --release-command migration; the marker it created was readable after activation.  
  **Observed At:** 2026-09-20T23:45:31Z  
  **Implementation Revision:** 4d1511e574302f3904b75088bd4048a0975218b3-dirty (CLI 0.1.21)  
  **Expires At:** 2027-03-19T23:45:31Z

### Last Verified At
2026-09-20T23:45:31Z

### Unknowns
- region availability is unknown until a verified region fact is recorded
- compliance attestations are unknown; none are claimed

### Formats
- **HTML:** https://ample.computer/recipes/recruiting-tracker/phoenix/private-attachments  
- **Markdown:** https://ample.computer/recipes/recruiting-tracker/phoenix/private-attachments.md  
- **JSON:** https://api.ample.computer/v1/catalog/recipes/page%3Arecipes%3Arecruiting-tracker%3Aphoenix%3Aprivate-attachments

### Next Actions
- **Action ID:** browse-catalog  
  **Label:** Browse the catalog index  
  **Operation ID:** catalog_index  
  **Method:** GET  
  **Relative Path:** /v1/catalog  
  **Requires Authentication:** false  
  **Requires Approval:** false

- **Action ID:** search-recipes  
  **Label:** Search published recipes by intent, stack and constraints  
  **Operation ID:** search_recipes  
  **Method:** POST  
  **Relative Path:** /v1/catalog/search  
  **Parameters:**  
  - **Body:**  
    - **Limit:** 5  
    - **Query:** Host recruiting tracker with Phoenix: private attachments  
  **Requires Authentication:** false  
  **Requires Approval:** false

- **Action ID:** plan:page:recipes:recruiting-tracker:phoenix:private-attachments  
  **Label:** Prepare a side-effect-free deployment plan for an authorized project  
  **Operation ID:** plan_deployment  
  **Method:** POST  
  **Relative Path:** /v1/catalog/plan  
  **Parameters:**  
  - **Body:**  
    - **Inputs:** {}  
    - **Project ID:** ""  
    - **Recipe ID:** page:recipes:recruiting-tracker:phoenix:private-attachments  
    - **Recipe Revision:** r1  
  **Requires Authentication:** true  
  **Requires Approval:** false

- **Action ID:** auth-setup  
  **Label:** Read the existing agent authentication setup  
  **Operation ID:** existing_auth_setup  
  **Method:** GET  
  **Relative Path:** /mcp/setup  
  **Requires Authentication:** false  
  **Requires Approval:** false

- **Action ID:** browse:workload:recruiting-tracker  
  **Label:** Browse Recruiting tracker  
  **Operation ID:** browse_node  
  **Method:** GET  
  **Relative Path:** /v1/catalog/nodes/workload%3Arecruiting-tracker  
  **Parameters:**  
  - **Node ID:** workload:recruiting-tracker  
  **Requires Authentication:** false  
  **Requires Approval:** false

- **Action ID:** browse:stack:framework-phoenix  
  **Label:** Browse Phoenix  
  **Operation ID:** browse_node  
  **Method:** GET  
  **Relative Path:** /v1/catalog/nodes/stack%3Aframework-phoenix  
  **Parameters:**  
  - **Node ID:** stack:framework-phoenix  
  **Requires Authentication:** false  
  **Requires Approval:** false

- **Action ID:** browse:pattern:private-document-library  
  **Label:** Browse Private document library  
  **Operation ID:** browse_node  
  **Method:** GET  
  **Relative Path:** /v1/catalog/nodes/pattern%3Aprivate-document-library  
  **Parameters:**  
  - **Node ID:** pattern:private-document-library  
  **Requires Authentication:** false  
  **Requires Approval:** false

- **Action ID:** browse:intent:deploy-web-app  
  **Label:** Browse Deploy web app  
  **Operation ID:** browse_node  
  **Method:** GET  
  **Relative Path:** /v1/catalog/nodes/intent%3Adeploy-web-app  
  **Parameters:**  
  - **Node ID:** intent:deploy-web-app  
  **Requires Authentication:** false  
  **Requires Approval:** false