If you're doing any kind of backend work, you need to know how your persistence layer works. You don't need to be an expert, but you need to realize the implications of what you're doing with the ORM. You need to be able to diagnose issues with your database.
There is a grey area between 'don't know' and 'expert'. and what the if someone says it's bad that jr devs don't know something, it doesn't mean they need to be an expert.
If you're doing any kind of backend work, you need to know how your persistence layer works. You don't need to be an expert, but you need to realize the implications of what you're doing with the ORM. You need to be able to diagnose issues with your database.
There is a grey area between 'don't know' and 'expert'. and what the if someone says it's bad that jr devs don't know something, it doesn't mean they need to be an expert.