`SQLInterface`: Logger, exceptions

[AlexanderMann]

Motivation

SQLInterface has no Error class, nor does it have a Logger. Both of these things are relatively simple, and would make surfacing problems to users much simpler.

Suggested Musical Pairing

https://soundcloud.com/kevinmorby/beautiful-strangers

[AlexanderMann]

Logger has been tackled here: #76

Error class would still be wise.