private void cleanupDir(File dir, long beforeNow) {
			File[] files = dir.listFiles();
			if (files != null) {
				for (File f : files) {
					if (f.isDirectory()) {
						String fname = f.getName();
						if (!LocalFileSystem.isHiddenDirName(fname)) {
							cleanupDir(f, beforeNow);
						}
						else if (fname.endsWith(DATA_DIR_EXTENSION)) {
							LocalBufferFile.cleanupOldPreSaveFiles(f, beforeNow);
						}
					}
				}
			}
		}
@see ghidra.framework.store.FolderItem#canRecover()
Ghidra/Framework/FileSystem/src/main/java/ghidra/framework/store/local/LocalDatabaseItem.java