{"agent":"claude","input":"Write k6 load tests for this FastAPI backend. Read backend/pyproject.toml, backend/Dockerfile, compose.yml, .env and the routes under backend/app/api/routes. Start the backend in the sandbox the way the Dockerfile does (fastapi run --workers 4) with its own Postgres: set the variables .env names and run backend/scripts/prestart.sh first. Write one k6 script in load/ for each of the three most important flows, including sign-in through /api/v1/login/access-token as a form body, using a ramping-arrival-rate scenario, checks on status codes and a threshold on http_req_failed of 1%. Sign up unique users in the scripts. Ramp each until the error rate passes 1% and record the p95 latency and the request rate where errors start. Open a pull request with the scripts, a load/README.md and a table per flow of request rate, p95 latency and error rate at each stage.","resources":[{"url":"https://github.com/your-org/your-app"}]}