docs: def CountAPIAuditEntriesByUserAndDay(self,
                                         min_timestamp=None,
                                         max_timestamp=None):
      """Returns audit entry counts grouped by user and calendar day."""
      results = collections.Counter()
      for entry in self.api_audit_entries:
        if min_timestamp is not None and entry.timestamp < min_timestamp:
          continue
  
        if max_timestamp is not None and entry.timestamp > max_timestamp:
          continue
  
        # Truncate DateTime by removing the time-part to allow grouping by date.
        day = rdfvalue.RDFDatetime.FromDate(entry.timestamp.AsDatetime().date())
        results[(entry.username, day)] += 1
  
      return dict(results)