⚛️ Transactions & Basic Indexing

This is another VERY important backend concept, especially when you work with PostgreSQL, SQLAlchemy, FastAPI and real-world applications. 💪

Imagine you're building an e-commerce app 🛒. A user buys a product and your app must reduce its stock. Now imagine something breaks halfway:

✅ Product A's stock gets reduced

❌ Product B's stock does not get increased

💥 Your database now holds incorrect information

How do we prevent this? That's exactly where transactions, ROLLBACK, COMMIT and indexing come in.

We'll learn everything from absolute zero, with SQL examples, real-world analogies, PostgreSQL experiments and FastAPI connections.…