netdisco/Netdisco/lib/App/Netdisco/DB/schema_versions/App-Netdisco-DB-37-38-PostgreSQL.sql

BEGIN;

ALTER TABLE device_port DROP COLUMN is_uplink_admin;
ALTER TABLE device_port ADD COLUMN "slave_of"  text;
ALTER TABLE device_port ADD COLUMN "is_master" bool DEFAULT false NOT NULL;

COMMIT;