@Override
	protected void close() {
		closing = true;
		objectManager.flushWbCaches();
		super.close();
		objectManager.waitWbWorkers();
	}
Cannot pre-construct fixedProgramViewsView, because the UnmodifiableMap will cache
values() on the first call, and the CowMap will change that with every mutation. Thus,
the view would not see changes to the underlying map.
Ghidra/Debug/Framework-TraceModeling/src/main/java/ghidra/trace/database/DBTrace.java