The Carnegie Mellon University (CMU) Database Group with Andy Pavlo [1] puts out a ton of content, including lectures on architecture, and interviews and presentations with various database companies. Check out the seminar playlists for video series and notes. [2] They also have research projects like Peloton. [3]

[1] https://db.cs.cmu.edu/

[2] https://www.youtube.com/channel/UCHnBsf2rH-K7pn09rb3qvkA/fea...

[3] https://github.com/cmu-db