Senior IIoT / Python Backend Engineer — Air-Gapped Edge Infrastructure (FastAPI / Streamlit)

We are deploying an industrial IoT dashboard to an air-gapped, local Ubuntu Edge PC. Your objective is to build a hardened FastAPI ingestion router, a 60fps Streamlit local dashboard, and package the environment into a secure Docker container. You will be provided with a compiled, black-box Python engine. Your API will catch an 8-variable JSON payload every 60 seconds from a SCADA network, pass it to the engine, and render the output. To prove you are an Edge Infrastructure engineer, start your proposal with the answer to this exact question: If a FastAPI endpoint is running inside an air-gapped Docker container under a restricted non-root user, and the host Ubuntu machine experiences a hard power failure, exactly what Docker Compose policies and Linux daemon configurations are required to guarantee the API comes back online securely without manual intervention?