ALTER TABLE "Model3DAsset"
  ADD COLUMN IF NOT EXISTS "shareEnabled" boolean NOT NULL DEFAULT false;

ALTER TABLE "Model3DAsset"
  ADD COLUMN IF NOT EXISTS "shareToken" varchar(64);

ALTER TABLE "Model3DAsset"
  ADD COLUMN IF NOT EXISTS "sharedAt" timestamp;

CREATE UNIQUE INDEX IF NOT EXISTS "Model3DAsset_shareToken_idx"
  ON "Model3DAsset" ("shareToken");