Document exception hierarchy
Cheers! Wow, that was fast. Thanks. For what it's worth, the peewee exceptions are based on those already documented in the DB-API 2.0 spec. https://www.python.org/dev/peps/pep-0249/#exceptions Good to know, thanks for the pointer.
Sometimes I want to make sure I'm catching all possible peewee exceptions, but not knowing the base exception makes it hard. Having the exception hierarchy in API docs (inspired by [docs for built-in exceptions][1]) could be handy for this.

[1]: https://docs.python.org/3/library/exceptions.html#exception-hierarchy