To deploy a FastAPI app with PostgreSQL database in AWS EC2, follow these steps:SSH into your AWS CLI and update the system.Install Postgres, Nginx, Python3 pip, and venv.Set up Postgres, create a database, and generate an SSH profile.Create a folder for Git projects, clone the repo, and set up a virtual environment.Install requirements and Gunicorn server, set up the .env file, and test the server using Uvicorn.Setup Gunicorn service, create an NGINX config file, enable NGINX, and allow SSH, HTTP, and HTTPS traffic.Install Certbot for SSL certificates and configure the domain name.