Got asked to explain the tradeoffs in my own side project instead of a leetcode question and it was harder than I expected

Walked in ready for arrays and got asked instead why I picked Postgres over a document store for a project I built two years ago. Realized I'd made that decision on a whim back then and never actually had to defend it out loud to someone qualified to push back. Fumbled the first answer, recovered on the follow up, but it was a good reminder that side projects need the same tradeoff thinking as the actual interview prep.