Build a Real Sales API Endpoint (FastAPI + PostgreSQL)

Описание: ▶️ Part of the Building a Production-Style FastAPI Backend (PostgreSQL-First) series
📘 Watch the full playlist here:    • Building a Production-Style FastAPI Backen...  
💻 GitHub repository for this series: github.com/marcmanmedia/northwind-lite-fastapi

In this episode of the FastAPI Backend Series, we build our first real business endpoint — employee sales performance — using PostgreSQL views and FastAPI.

This isn’t a toy example.

We connect to a production-grade PostgreSQL database (Northwind-lite) hosted in the cloud and expose a /sales endpoint that returns aggregated employee revenue data.

What You’ll Learn:
✔ Why would database views belong in production systems
✔ How to create a PostgreSQL aggregation view
✔ How to expose raw SQL safely using SQLAlchemy
✔ How FastAPI dependency injection works
✔ How to return structured JSON from database queries

Architecture Principle:
The database computes.
The API exposes.
The client consumes.

We move business logic closer to the data layer using a PostgreSQL view and keep our FastAPI layer clean and intentional.

Tech Stack:
FastAPI
PostgreSQL
SQLAlchemy
Pydantic (coming next episode)
VS Code
Cloud-hosted PostgreSQL (Neon)

Next Episode:
In Episode 5, we introduce Pydantic response models and transform our endpoint into a fully defined API contract.

If you're building real backend systems and want production-level architecture patterns — this series is for you.

#FastAPI #PostgreSQL #BackendDevelopment #PythonAPI #SoftwareArchitecture #SQLAlchemy #RESTAPI #WebDevelopment