text: alter table retraceduser
  	add column timezone text not null default 'US/Pacific',
  	add column tx_emails_recipient boolean not null default true;
  
  create table environmentuser (
  	user_id text not null references retraceduser on delete cascade,
  	environment_id text not null references environment on delete cascade,
  	daily_report boolean not null default true,
  	email_token text not null,
  	primary key (user_id, environment_id)
  );
  