What I gained from the article wasn't that the dev was unaware of indices, it's that he didn't realise indices were missing due to how planetscale's database di

What I gained from the article wasn't that the dev was unaware of indices, it's that he didn't realise indices were missing due to how planetscale's database disallows foreign keys. I never worked with a database that doesn't have foreign keys and it's not unthinkable to forget when you do for the first time, that foreign keys were what created indexes for you automatically. A little bit of planning could have prevented that though :/