text: CREATE SEQUENCE subjects_id_seq;
  CREATE TABLE subjects (
    id BIGINT PRIMARY KEY DEFAULT nextval('subjects_id_seq'::regclass),
    name TEXT NOT NULL,
    created_at TIMESTAMP WITHOUT TIME ZONE NOT NULL,
    updated_at TIMESTAMP WITHOUT TIME ZONE NOT NULL
  );
  
  CREATE UNIQUE INDEX index_subjects_on_name ON subjects(name);
  SELECT diesel_manage_updated_at('subjects');
  