I am trying to not lose control of individuals added to the ontology. One suggested that a solution is to stamp every individual added or a set of individuals pertaining to a specific event with the same timestamp. Later, we can access all individuals in a specific time to do more analysis for example. Is there a better approach you would like to suggest to organize data storage for later access? Graph databases sound messy for me as a newcomer, unlike tabular databases which are organized in a way that makes accessing them very easy and to do correlation and queries later on.