text: DROP TABLE IF EXISTS users CASCADE;
  DROP TABLE IF EXISTS users_lists CASCADE;
  DROP TABLE IF EXISTS tasks CASCADE;
  
  CREATE TABLE users (
    id SERIAL UNIQUE PRIMARY KEY NOT NULL,
    full_name varchar,
    email varchar,
    created_at timestamp NOT NULL,
    password varchar
  );
  
  
  CREATE TABLE tasks (
    id SERIAL UNIQUE PRIMARY KEY NOT NULL,
    user_id int REFERENCES users(id) ON DELETE CASCADE,
    last_modified timestamp NOT NULL,
    description varchar NOT NULL,
    category varchar NOT NULL,
    active Boolean NOT NULL DEFAULT true
  );
  