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You just joined Fathom, a photo-sharing app. People post pictures, follow each other, and like what they see. Two things to notice. Following someone does not make them follow you back — those are two separate facts. And the numbers on a profile — 812 followers, 44 likes — are not stored anywhere. They are counted from rows, every time the page loads. Design the first simple database behind the feed.
out of scopeStories · direct messages · hashtags · notifications · blocking · ranking
pnpm dev:api and reload.The canvas below still works, so you can model now and run the review once the service is up.Practice studio
Start with the data model, then layer system context
Use entities and relationships for the real ERD. Add notes, containers, or curated cloud shapes only when they sharpen the story you are architecting.
This scenario runs a full workspace — editor, canvas and results side by side. It needs a laptop or desktop to be usable. Open this page on a bigger screen to start building.