example SQL for the persons:

SELECT first_name, last_name, (first_name || ' ' ||
last_name) AS full_name FROM phpgw_contact_person GROUP BY
full_name HAVING count(full_name) > 1;

needs a db specific concat function

Could we have a builtin filter (maybe a button
available to admins) that displays all the records that
have duplicate firstname+lastname for persons and
duplicate company name for orgs to allow the abmin to
view, edit, delete them (to help with db cleanup)