When requesting to change it, it stays the same in DB

First, we get
NoReverseMatch at /patients_manager/unassign_questions/1/8251083/
Reverse for 'assign_questions' with no arguments not found. 1 pattern(s) tried: ['patients_manager\/assign_questions\/(?P<patient_id>[0-9]+)\/$']

After clicking the button three times, we get

MultipleObjectsReturned at /patients_manager/unassign_questions/1/8251083/
get() returned more than one PendingQuestion -- it returned 3!

There are many models files in web interface apps folders that are not necessary

The quick fix was to copy-paste the lib code inside the filter.
Correct fix: inherit from MessageFilter instead of BaseFilter

We need to send questions to the patients according to their local time, avoiding errors with daylight saving times.

To ask a daily question, we are only comparing the day of the month, not the time elapsed between the last answer