Systems and processes for storing correlated data in a graph database are described. A first user node may be stored. In response to a request, a first event node and a second user node may be stored. The first event node may be associated with the first user node through an edge indicating participation. The first event node may be associated with the second user node through an edge indicating participation. In response to a content access, a second event node and a content node may be stored. The second event node may be associated with the first user node through an edge indicating participation. The second event node may be associated with the content node through an edge indicating usage. The first user node may be associated with the content node through an edge indicating the first user node handles the content node.