public ProgramModule getDefaultRootModule() {
		try {
			RecordIterator iter = treeAdapter.getRecords();
			while (iter.hasNext()) {
				DBRecord record = iter.next();
				String name = record.getString(ProgramTreeDBAdapter.TREE_NAME_COL);
				return getRootModule(name);
			}
		}
		catch (IOException e) {
			errHandler.dbError(e);
		}
		return null;
	}
Returns the root module for the default program tree. The default tree is the oldest tree.
@return  the root module for the default program tree. The default tree is the oldest tree.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/module/TreeManager.java