Topic on Talk:Best practices for extensions/Flow

Done.

There's no rating for this item under the Database section. Is it something that must be done, should be, or recommended?

I didn't see this at the time, but I added "should" in front of it last year in this edit as part of a general formatting copy-fix. I didn't intentionally make a choice there. I've changed it to "optional" now because 1) This is something virtually no extension does today so it seems only right to begin there given that these are meant to reflect current practice, and 2) There is a related item about uninstall instructions under "Documentation" which is also optional already.