function (new_user, old_user, userCtx, secObj) { 
  if (!new_user) return;
  
  if (new_user._deleted) {
    log("Deleted user " + new_user._id + " by user " + userCtx.name);
  } else if (!old_user) {
    log("Added user " + new_user._id + " by user " + userCtx.name);
  } else { 
    log("Updated user " + new_user._id + " by user " + userCtx.name);
  }
}
