We're all here stroking our gray beards about how kids these days don't even understand the tools they're using, and then you turn around and say "i dunno, the ORM handled it for me"?
SQL hasn't appreciably changed in 40 years. I'll take your word that you really know your C/Unix stuff, and I get that gamedev is it's own niche, but I'd expect most senior devs to have developed a rock-solid grasp of SQL just by osmosis over their years.
These sort of things are the reason I have to these days deal with programmers who show me their several thousands of lines of code and feel proud about it, until I show them it can done with a few SQL queries. Or that Java/Python program who proudly flaunts their few thousands of lines of code weekend project, which is basically a awk command that can be written under 3 minutes.
Only a few months back I was asked to review a backend application. The developer explained passionately how his massive structure of Java code plays with the store, which happens to be a key-value store, while the application is largely transactional in nature. Despite explaining to them why this isn't great idea even from an operations perspective, let alone conceptually or design wise they went ahead. Last time I checked they have to often deal with dirty read/write issues in case of temporary failure, and disk crashes apparently are common.
These sort of issues can be avoided if devs sit down and get basic exposure to things SQL, which by the can be done under a few weeks.
I've been a webdev now for some time, and I've written zero SQL queries. Firebase is nice. So is Mongoose. And yes, I can structure it as a traditional SQL relational database with proper indices if needed. I'm not choosing technologies that cause technical debt or problems down the road.
If you think that you can't take a programmer with a decade of experience and a background in security (where I performed SQL injection attacks) and train them to write SQL queries, then that says a lot about the company. I don't regret failing that interview.