Nice suggestion. Will definitely try to refactor. Thanks!

In most of the cases, timestamps should be with the data itself (assuming its a dynamic graph). If timestamps are to be chosen, one can select in a way seeing how many edges usually come in one time tick (second/minute etc.)

Timestamps don't affect any parameters other than alpha (temporal decay factor). You may want to check out how to decay the contribution of the past edges in the anomalousness of the current edge. If there is lot of granularity in the timestamps, a smaller alpha should be chosen. Hope it helps.