Flyway is a great tool for Databases Version Control, however, Flyway Migrations number tends to swell dramatically and harden the day-to-day work. Squashing Flyway Migrations is safe and easy - much recommended. — This blog assumes that you’re already familiar and working with Flyway. To those of you who aren’t, I recommend Flyway official documentation, it’s great and totally perfect to begin with.

Better to use different behaviour in "How can my code be made more modular?" example, as the functions are meaningless (you don't need a function to get a list size, you simply use the list function "size", same for add. I liked the example from the lecture, when you had a function that both sum and print, which was not pure, and then you separated it into two pure functions, one that sums and the other prints.