generated by 'pg_dump -U verbcoach -d verbcoach > src/sql/create.sql'
set up default id and sequence for tags (vgroups)
selecting from tags works
remove fetch-by-id-per-table: use do-each-row instead.
add verbs as a (ANSI SQL type) array
vgroup’s verbs are an ANSI SQL array.
(db/fetch) always returns an array, even if you fetch with {:_id id}
use postgres rather than mongo