I am completely clueless about databases. @shazow told me which kind to use when working on WIL locally (Django does make it easy, plus I have the add-on "South" which apparently does a lot of work for you as well), and DotCloud took care of my database problems when I launched.
i am collecting stories about problems with altering schemas while prototyping and while in production (losing data, manual altering tables, relational dbs restrictions, many-to-many relationships and other complexities) but it seems it all went smoothly with the tools you had.
