Enhance tags

prisma/migrations/20251220224429_artwork_4/migration.sql

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+-- AlterTable
+ALTER TABLE "ArtTag" ADD COLUMN     "parentId" TEXT;
+
+-- AddForeignKey
+ALTER TABLE "ArtTag" ADD CONSTRAINT "ArtTag_parentId_fkey" FOREIGN KEY ("parentId") REFERENCES "ArtTag"("id") ON DELETE SET NULL ON UPDATE CASCADE;