We have created a custom SDA container to store a certain kind of new, customized patient data.
We are observing a behavior in the correspoding analytics table for this custom SDA class where rows are added for a patient for which the MPI is null and the patient record does not exist.
From what we can tell, it seems that, when there is a MPI link/unlink, rows are added to analytics linked to the new Patient record that contains the latest MPI, but the old rows linked to the old (now non-existent) Patient are not removed.