Gaffer
github.com/GovernmentCommunicationsHeadquarters/Gaffer
Repository
gchq/GafferArchived
A large-scale entity and relation database supporting aggregation of properties
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
Gaffer is a framework that makes it easy to store large-scale graphs in which the nodes and edges have statistics such as counts, histograms and sketches. These statistics summarise the properties of the nodes and edges over time windows, and they can be dynamically updated over time.