SQL tables can be upgraded using:
  UPDATE config SET name = 'nid' WHERE name = 'uuid';

then for MySQL:
  ALTER TABLE pt CHANGE uuid nid INT NOT NULL;

or SQLite:
  ALTER TABLE pt RENAME TO old_pt;
  CREATE TABLE pt (rid INTEGER NOT NULL, nid INTEGER NOT NULL, state INTEGER NOT NULL, PRIMARY KEY (rid, nid));
  INSERT INTO pt SELECT * from old_pt;
  DROP TABLE old_pt;