What's the target demographic for something like this? It seems like the trivial part of refactoring.

I've seen a similar, entire book dedicated to database refactoring that had roughly the same pattern. Chapters named akin to "The Change Table Name Refactor" felt kind of bizarre, when what I was hoping would be contained was advice about refactoring large databases in practice (moving data to new service boundaries, etc). Practical advice on building systems to move data and such seems to be just missing