static void seedDBFrom_migratingClasses(S progID, O... migrations) {
  File f1 = getProgramFile(progID, "concepts.structure.gz");
  File f2 = getProgramFile(programID(), "concepts.structure.gz");
  if (!f2.exists() && f1.exists())
    saveGZTextFile(f2, migrateClassesInStructureText(loadGZTextFile(f1), migrations));
}