How to associate User data with custom module?
As usual there are plenty of ways to do something with Drupal.
Of course it would be possible to create a content type and import it via Feeds but sometimes (in case it might become plenty of data) it could be better to use a different approach.

So far it seems I'd go with MongoDB, the appropriate module and get the data into the DB using JSON and try to relate that to the current user if or where needed. Due to the amount of data and the visualisation it seems to be better to go the Document DB way.