Simple postgres script to create a users table

create_users_table.sql

CREATE TABLE IF NOT EXISTS users (
  id uuid  PRIMARY KEY  DEFAULT gen_random_uuid(),
  name varchar(32)  UNIQUE  NOT NULL  CHECK (length(name) >= 3),
  avatar_file bytea  STORAGE EXTERNAL  CHECK (avatar_file IS NULL OR length(avatar_file) < 50000),
  about_me varchar(2048),
  date_time_creation timestamp  NOT NULL  DEFAULT (CURRENT_TIMESTAMP AT TIME ZONE 'utc'),
  date_time_last_login timestamp  CHECK (date_time_last_login IS NULL OR date_time_last_login >= date_time_creation)
);