Can't add user in anonymous mode to a group automatically

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FWIW, I “solved” this problem in a forum I run on the database level. Only use it if you can’t get other, more high-level solutions to work (has there been any progress in this, or should some existing reply be flagged as “solved”?). Here’s the PostgreSQL code:

create or replace function anon_insert_copy_groups_to_anon_user()
  RETURNS TRIGGER 
  LANGUAGE PLPGSQL
  AS $$
declare
  anon_user_id integer = new.user_id;
  master_user_id integer = new.master_user_id;
  active boolean = new.active;
  created_at timestamp = new.created_at;
  updated_at timestamp = new.updated_at;
BEGIN
  insert into group_users 
        (group_id,                user_id,       created_at,        updated_at,        owner, notification_level,     first_unread_pm_at)
  select group_users.group_id, anon_user_id , current_timestamp, current_timestamp, false, 3 as notification_level, current_timestamp
  from group_users 
  where group_users.user_id=master_user_id
  and   group_users.group_id not in (select group_id from group_users where group_users.user_id=anon_user_id)
  and   group_users.group_id not in (1, 2, 3); -- exlude admins, moderators and staff!

  return new;
end;
$$;

-- Create the trigger
CREATE TRIGGER anon_insert_trigger
AFTER INSERT ON anonymous_users
  FOR EACH ROW
    EXECUTE FUNCTION anon_insert_copy_groups_to_anon_user();