Django REST API with PostgreSQL — Advanced Queries & Optimization

Introduction Building a REST API with Django REST Framework (DRF) is straightforward — but making it fast and scalable with PostgreSQL requires understanding advanced query techniques. In this guide, you'll learn how to write optimized queries, avoid common pitfalls like the N+1 problem, use PostgreSQL-specific features, and measure performance. Prerequisites Django + DRF project set up PostgreSQL connected via psycopg2 Basic understanding of Django ORM Project Setup We'll use a simple blogging API with these models: python# models.py from django.db import models class Author(models.Model): name = models.CharField(max_length=100) email = models.EmailField(unique=True) bio = models.TextField(blank=True) def __str__(self): return self.name class Tag(models.Model): name = models.CharField(max_length=50, unique=True) def __str__(self): return self.name class Post(models.Model): title = models.CharField(max_length=200) content = models.TextField() author = models.ForeignKey(Author, on_delet