text: CREATE TABLE user_watches_site_group_prompt_email (
  	user_account_id INTEGER NOT NULL,
  	group_id INTEGER NOT NULL,
  	sent_at timestamp without time zone NOT NULL,
  	PRIMARY KEY(user_account_id,group_id,sent_at)
  );
  
  ALTER TABLE user_watches_site_group_prompt_email ADD CONSTRAINT user_watches_site_group_prompt_email_user_account_id FOREIGN KEY (user_account_id) REFERENCES user_account_information(id);
  ALTER TABLE user_watches_site_group_prompt_email ADD CONSTRAINT user_watches_site_group_prompt_email_group_id FOREIGN KEY (group_id) REFERENCES group_information(id);
  