INSERT and SELECT both seem to work
Successfully drop, create, insert, and select in documents test
Changed test to use get and set methods that ignore their arguments
set uses its actual arguments
get returns the actual value of the row with the right key
Factored knex out into database wrapper
Non-functional attempt at a real Postgres upsert
Naive upsert (trying to get the value first and then either insert or update depending on whether we find one)