If anything this shows how insanely difficult it must be to succeed as a database startup (when was the most recent startup success in this space?), as the founding team is stellar.
On the other hand I am surprised it died this quick and interested to know if they did a proper postmortem. Not only did they raise way more than is needed to survive for three years but the idea is about utilising AI to improve DB performance and I find it hard to imagine they couldn't find more investors to lend them a lifeline with all the AI hype.