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🔹 What is BigAutoField? BigAutoField is a primary key field type in Django. It’s like an AutoField , but it uses a 64-bit integer instead of a 32-bit integer. That means it can hold much larger values. In databases: AutoField → usually maps to INT (32-bit, max ≈ 2.1 billion) BigAutoField → maps to BIGINT (64-bit, max ≈ 9.2 quintillion) 🔹 Why Django Introduced It Large applications can have billions of rows. A normal AutoField (32-bit) runs out of IDs at ≈ 2.1 billion. BigAutoField solves this by allowing much larger primary key ranges. 🔹 Example Usage You can explicitly define it in a model: id = models.BigAutoField(primary_key=True) Or globally in your project (Django 3.2+ default): DEFAULT_AUTO_FIELD = "django.db.models.BigAutoField" This means: If you don’t explicitly define a primary key, Django will use BigAutoField automatically. 🔹 When to Use It ✅ Use BigAutoField if:...