🔒 Isolation, MVCC, Locking, Triggers, Audit Logging & CAP Theorem

This is one of the MOST important database topics for a Full Stack Developer. 💪

Imagine you're building an Instagram-like Social Feed . Thousands of users might like posts, comment, follow people and update profiles at the same time . Now imagine:

🛒 Two users try to buy the last available product

🏦 Two requests update the same bank account

❤️ Someone likes a post while another person deletes it

💥 A transaction fails halfway through

👀 Two people read the same data while a third is modifying it

How does the database prevent incorrect data, conflicts and inconsistent results? That's exactly what we'll learn, from absolute zero, with PostgreSQL examples and connections to FastAPI and SQLAlchemy .…