ALTER TABLE osint.exhibit_connections
  ADD COLUMN tightness SMALLINT NOT NULL DEFAULT 65
  CHECK (tightness BETWEEN 0 AND 100);

COMMENT ON COLUMN osint.exhibit_connections.label IS 'Investigator-authored tag describing the meaning of this thread';
COMMENT ON COLUMN osint.exhibit_connections.tightness IS 'Visual thread tautness percentage from 0 (slack) to 100 (taut)';