It also turns out that the server has Activity dating back to 9 Oct 2012. The sqbdata process is responsible for the long running query, hence the 6 full months of activity may be the underlying issue, not the client or server dat or sdf files...
Maintenance plan for History Cleanup is now configured, executed, and we're down to 30-days.
Maintenance plan for History Cleanup is now configured, executed, and we're down to 30-days.