Big fan of the columnar topographical sort, most graph visualizations get this wrong and render everything as a "soup" of nodes and edges. With your viz I can tell exactly how far away everything is.

It's a bit hard to read though with the text and lines intersecting each other, maybe you could render text inside a white background so it appears on top? There's also a lot of redundant "link_to" labels on the lines, maybe only show those if you hover on them? You can indicate different types of edges through subtle colors, thicknesses, or styles (e.g., dotted).

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