ALTER TABLE "person"
ADD COLUMN "person_use" varchar(254);

UPDATE "person" SET "person_use" = 'concerning' where "concerning" = true;
UPDATE "person" SET "person_use" = 'correspondent' where "concerning" = false;
UPDATE "person" SET "person_use" = 'both' where "concerning" is null;

ALTER TABLE "person"
DROP COLUMN "concerning";
