'New Model' modal/dialog does not prevent creation of pre-existing Models

[travis-a-hoffman]

I'm new to caribou, was trying to create a Model object called "Role", which I meant as a "Role in a Story." The resulting error (in the log) shows the following attempted SQL:

DEBUG :db create table role ([:id "SERIAL" "PRIMARY KEY"] [:uuid "varchar(255)"] [:position :integer "DEFAULT 0"] [:env-id :integer "DEFAULT 1"] [:locked :boolean "DEFAULT false"] [:created-at "timestamp" "NOT NULL" "DEFAULT current_timestamp"] [:updated-at "timestamp" "NOT NULL"])
DEBUG :stacktrace >>> org.h2.jdbc.JdbcSQLException: Table "ROLE" already exists; SQL statement:
CREATE TABLE role (id SERIAL PRIMARY KEY, uuid varchar(255), position integer DEFAULT 0, env_id integer DEFAULT 1, locked boolean DEFAULT false, created_at timestamp NOT NULL DEFAULT current_timestamp, updated_at timestamp NOT NULL) [42101-170]

The admin UI results in a blank page. Nothing seems to be borked on the backend, but I haven't dug any deeper. I've tried with other pre-existing models, same result. Basically, 'New Model' just needs a check to prevent this, or to handle this error case more cleanly.