I love reading about articles on Databases, especially about their internal workings. Some of the blogs I follow:

1. Oren Eini - Creator and CTO of Raven DB - https://ayende.com/blog

2. Tyler Neely - Creator of Sled DB - https://medium.com/@tylerneely

3. Philip O'Toole - Creator of rqlite - https://www.philipotoole.com/

4. Martin Kleppmann - Author of Designing Data-Intensive Applications - https://martin.kleppmann.com/archive.html

5. Glauber Costa - worked on glommio, scylla DB - https://glaubercosta-11125.medium.com/

Do recommend me if you know more!