-- #204 (ADR 0022): classification becomes first-class page metadata. The
-- column is a marking, not a protection mechanism — permissions are
-- untouched. NOT NULL with a default backfills every existing page to
-- UNCLASSIFIED in the same statement.
CREATE TYPE "PageClassification" AS ENUM ('UNCLASSIFIED', 'VS_NFD');

ALTER TABLE "pages"
  ADD COLUMN "classification" "PageClassification" NOT NULL DEFAULT 'UNCLASSIFIED';