This reverts commit d1a75af8.

This caused errors when snapshotting graph.

This reverts commit 5d658a43.

Also, add "Advanced" endpoint for node list update to update charts.

This is not the optimal solution since it duplicates so much
data. Best would be to add "children" in the node directly.

This doesn't compile yet.

Order of authors, date, source doesn't matter and we can interleave contents.