If you understand databases at a basic level, you stop building toy apps.

The 80/20

• An entity is a thing you store (Lead, Patient, Deal, Task)
• A relationship connects entities (a Patient has many Appointments)
• Validation prevents garbage data

Why it matters

Most bugs and “AI hallucinations” in apps are really data problems:

• missing fields
• inconsistent formats
• no permissions model

In the sprint, we teach the minimum database thinking you need — while building your real use case.