Also, while it seems to work tolerably well with the included sample database, connecting it to a local Postgres instance seems to work to the level of connecting and getting all the schema information, but every attempt to run a "question" -- even the simplest pick-a-table-and-go, or the questions it automatically suggests -- results in the "We couldn't understand your question. Your question might contain an invalid parameter or some other error." message, so it seems like there are some pretty significant rough edges.