FastAPI + PostgreSQL Integration (Env Variables, SQLAlchemy & Sessions)

▶️ Part of the Building a Production-Style FastAPI Backend (PostgreSQL-First) series 📘 Watch the full playlist here: https://www.youtube.com/playlist?list=PLgQ3amFwmyEXQErYfi-W_n-n14dqrBj-c 💻 GitHub repository for this series: github.com/marcmanmedia/northwind-lite-fastapi In this episode, we connect our FastAPI backend to PostgreSQL using production-ready patterns. We configure secure environment variables, set up the SQLAlchemy engine, implement proper database session management, and validate the connection with a health check endpoint. This is where the API becomes a real backend system. What You’ll Learn: * How to use .env files securely * Why credentials should never live in source code * How to configure a SQLAlchemy engine * How database sessions work in FastAPI * How to implement a clean get\_db dependency * How to debug your backend using VS Code * How to validate your PostgreSQL connection Tech Stack: * FastAPI — API framework * SQLAlchemy — Database toolkit \& ORM * PostgreSQL — Relational database * Uvicorn — ASGI server * Visual Studio Code — Development environment Key Concepts Covered: * Environment variable management * Connection pooling * Session lifecycle management * Dependency injection in FastAPI * Production-style backend architecture * Health check endpoint validation By the end of this video, your FastAPI project will: ✔ Securely manage database credentials ✔ Maintain clean session handling ✔ Connect successfully to PostgreSQL ✔ Support debugging with breakpoints ✔ Validate database health before business logic In the next episode, we expose our first real data endpoint powered by a PostgreSQL view. #FastAPI #PostgreSQL #PythonBackend #SQLAlchemy #BackendDevelopment #APIDesign