First, I learned from your Kafka course and it was so incredibly helpful and I was moved to the point of admiring you as an instructor... so I ended up taking this course as well. I think this course is somewhat more focused on MySQL compared to Kafka and the previous course. But just like when I watched the real Kafka course, it was tremendously helpful. It was a great time to review architecture once again, and it was such a beneficial time having you explain with actual patterns as examples. And these days, as I use AI as a tool rather than a competitor, I do all my coding and query work through AI, but seeing you teach not just simple query tuning but also internal methods and tuning techniques made me realize 'Ah, this person is aware that AI handles simple tasks and created this course accordingly.' It seems like a course that includes only content that would be helpful with more realistic topics after considering so many aspects... This is the first time in my life I've written such a long review, which shows just how helpful it was. Thank you so much and I'll look forward to your next course if it gets released!!! :)