Deploy a FastAPI app with Postgres and Render Workflows using Codex CLI

A walkthrough demonstrates using Codex CLI with Render’s plugin and MCP capabilities to deploy an existing FastAPI application using async SQLAlchemy, asyncpg, Alembic, Render Postgres, and a Render Workflows task. Codex first generates and validates a render.yaml Blueprint, then deployment logs reveal five runtime issues that schema validation cannot detect: Uvicorn must bind to 0.0.0.0 and Render’s PORT, PostgreSQL URLs must be converted to the postgresql+asyncpg scheme for async SQLAlchemy and Alembic, an unauthenticated /healthz endpoint must be configured for health checks, Alembic migrations should run once through a pre-deploy command, and worker counts should rely on appropriately sized WEB_CONCURRENCY settings rather than a fixed number that may exhaust memory and database connections. The guide then moves a slow report-export operation out of the HTTP request path into a Render Workflows task, which stores results in Postgres and is triggered by the FastAPI service using a Render API key. It concludes by recommending verification through deployment and task logs, checking database results, and recognizing limitations such as workflows not being copied into Blueprint preview environments.

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