-- Add updated_at to company_notes so the notes service can return a real
-- modified timestamp (was substituting created_at). Backfill updated_at
-- to created_at for existing rows so they read as "never modified".
ALTER TABLE "company_notes"
  ADD COLUMN IF NOT EXISTS "updated_at" timestamp with time zone NOT NULL DEFAULT now();

UPDATE "company_notes" SET "updated_at" = "created_at";