code: def get_facts(self, date, end_date=None, search_terms="", ongoing_days=0):
          
          facts = []
          if ongoing_days:
              # look for still ongoing activities
              earlier_start = date - dt.timedelta(days=ongoing_days)
              earlier_end = date - dt.timedelta(days=1)
              earlier_facts = self._get_facts(earlier_start, earlier_end, search_terms=search_terms)
              facts.extend(fact for fact in earlier_facts if not fact.end_time)
          # add facts between date and end_date
          facts.extend(self._get_facts(date, end_date, search_terms=search_terms))
          return facts
docs: Returns facts for the time span matching the optional filter criteria.
             In search terms comma (",") translates to boolean OR and space (" ")
             to boolean AND.
             Filter is applied to tags, categories, activity names and description
             ongoing_days (int): look into the last `ongoing_days` days
                                 for still ongoing activities