code: private void keepLastUpdatedUnique() {
          Map<String, SingleTokenStats> temp = new HashMap<>();
          this.tokenStats.forEach(candidate -> {
              SingleTokenStats current = temp.get(candidate.tokenUuid);
              if (current == null) {
                  temp.put(candidate.tokenUuid, candidate);
              } else {
                  int comparison = SingleTokenStats.COMP_BY_LAST_USE_THEN_COUNTER.compare(current, candidate);
                  if (comparison < 0) {
                      // candidate was updated more recently (or has a bigger counter in case of perfectly equivalent dates)
                      temp.put(candidate.tokenUuid, candidate);
                  }
              }
          });
          
          this.tokenStats = new ArrayList<>(temp.values());
      }
docs: In case of duplicate entries, we keep only the last updated element