# Host csv import tool with Phoenix: relational workflow state

## Summary
Deploy a csv import tool built with Phoenix on Ample using the transactional workflows 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. Verified on Phoenix: an optimistic version check and an event row written in the same transaction, a stale update rejected, and a history query over the application-owned events (history=2 conflict=rejected). Not separately tested: your domain records, validation rules and concurrency policy; treat the csv import tool-specific behavior as your application code.

## Representative Queries
- Host csv import tool with Phoenix: relational workflow state
- Where can I host CSV import tool built with Phoenix?
- I need a domain record schema, validation rules and concurrency behavior.

## Resource Requirements
- **Compute**
- **Postgres**

## 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.

## Framework
Phoenix

## Workload
CSV import tool

## Release Status
Published

## Support Status
Verified

## Execution Status
Ready

## 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).
- An Ample account token with servers:write, databases:read.

## Tested Configuration
- **Template**: elixir-1.18
- **Runtime**: elixir
- **Size**: s-1vcpu-1gb
- **Install**: mix local.hex --force && mix local.rebar --force && MIX_ENV=prod mix deps.get --only prod
- **Build**: MIX_ENV=prod mix compile && MIX_ENV=prod mix release --overwrite
- **Start**: PHX_SERVER=true _build/prod/rel/$(ls _build/prod/rel | head -n 1)/bin/$(ls _build/prod/rel | head -n 1) start

## 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 transactional workflows: an optimistic version check and an event row written in the same transaction, a stale update rejected, and a history query over the application-owned events (history=2 conflict=rejected). Copy the approach into your schema; keep migrations idempotent and run them with --release-command.
3. **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 <name> --public
4. **Verify**: Fetch the live URL and the pattern self-test route(s) (/p/transactional-workflows) from the example; then run your own checks. On failure read `ample logs <deployment-name> --kind build` then `--kind runtime`. Command: ample logs <deployment-name> --kind build.

## Examples
- **Phoenix pattern fixture**: Multi-pattern Phoenix app whose transactional workflows module was checked live; the module is under tests/deploy-canaries/_pattern-modules.

## Success Checks
- App responds on its public URL. Kind: http_get, Path: /, Expect: ample canary phoenix patterns.
- Transactional-workflows self-test. Kind: http_get, Path: /p/transactional-workflows, Expect: tx=ok history=2 conflict=rejected.

## 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 csv import tool itself (your domain records, validation rules and concurrency policy) 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.

## Cost Estimate
- **Currency**: USD
- **Monthly Amount**: 10.0
- **Basis**: size prices from pricing.toml (loaded by the API) at build revision
- **Components**:
  - App server: s-1vcpu-1gb, Quantity: 1.0, Monthly Amount: 5.0
  - Managed PostgreSQL database: 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
- **Canary Run**: 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; checks passed for transactional-workflows and configuration-secrets). Pattern proof: an optimistic version check and an event row written in the same transaction, a stale update rejected, and a history query over the application-owned events (history=2 conflict=rejected).

## Next Actions
- **Browse the catalog index**: GET `/v1/catalog`
- **Search published recipes by intent, stack and constraints**: POST `/v1/catalog/search`
- **Prepare a side-effect-free deployment plan for an authorized project**: POST `/v1/catalog/plan`
- **Read the existing agent authentication setup**: GET `/mcp/setup`
- **Browse CSV import tool**: GET `/v1/catalog/nodes/workload%3Acsv-import-tool`
- **Browse Phoenix**: GET `/v1/catalog/nodes/stack%3Aframework-phoenix`
- **Browse Transactional workflows**: GET `/v1/catalog/nodes/pattern%3Atransactional-workflows`
- **Browse Deploy web app**: GET `/v1/catalog/nodes/intent%3Adeploy-web-app`