VETOnline

Implements a use case's backend: FastAPI router, Pydantic request/response schemas, service/domain layer, and SQLAlchemy models/queries. Use when the user asks to "implement the backend for UC-xxx", "build the API endpoint", "add a FastAPI route", "write the service layer", or mentions FastAPI implementation, Pydantic schemas, or SQLAlchemy queries for a specific use case.

Writes pytest unit and integration tests for a use case's backend, against an ephemeral Postgres container, and updates the use-case-to-test traceability matrix. Use when the user asks to "write tests for UC-xxx", "add pytest coverage", "test the backend", or mentions unit tests, integration tests, or pytest for a specific use case.

Implements a use case's frontend: a React view, form, or grid wired to the backend API, covering the main flow and every alternative/failure flow. Use when the user asks to "implement the frontend for UC-xxx", "build the React view", "wire up the form", "add the page for", or mentions React implementation for a specific use case.

Scaffolds or extends a Terraform module for this project's AWS infrastructure, wired to input.yaml, tagged per the cost-allocation strategy, and following least-privilege IAM. Use when the user asks to "create a Terraform module", "provision the VPC/Aurora/Lambda/Cognito", "add infrastructure for", or mentions Terraform, IaC, or AWS resource provisioning for this project.

Writes Playwright end-to-end functional tests and visual regression baselines for a use case, and updates the use-case-to-test traceability matrix. Use when the user asks to "write E2E tests for UC-xxx", "add Playwright coverage", "add a visual regression test", or mentions end-to-end testing or screenshot testing for a specific use case.

Creates versioned Alembic migration scripts with tables, columns, primary keys, foreign keys, unique and functional constraints (e.g. case-insensitive uniqueness), and reference-data seeds, all derived from the entity model. Use when the user asks to "create a migration", "add a database migration", "write an Alembic migration", "add a column", "add a foreign key", "seed reference data", or mentions Alembic, schema migration, or database schema changes.