I have already finished listening to the DB 2 lecture. Especially in the transaction propagation lecture, I was able to concentrate more because the examples were almost identical to the experiences I had in my actual work. At that time, I was embarrassed, but I did not know the concept of transaction propagation well, so I had to get help from a senior developer to solve it. However, after learning about it in detail through this lecture, I remembered my experience at that time and understood it better. Thank you for the great lecture as always. I will see you again in the next lecture!