In Bahmni IE Apps most of the classes are in the omod directory.
Even DAO, Services, Models etc...
They would rather belong to the api folder.
Move dao, mapper, model, service and validator to the api folder.
Keep the same directory structure so that the package name does not change.
Package name to access the newly located classes should not change so to avoid API consumers to refactor their code.
omod folder should only contain REST related contents, mostly Controller and related utility classes.