pnorman left a comment (osm2pgsql-dev/osm2pgsql#2406)
I'm not sure either - what I posted is a case of dependent objects, but this
issue might only be about object invalidation
> Processing of dependent objects currently only works through OSM object
> dependencies: when a node changes, all ways and relations containing the node
> are reprocessed, same for ways. This can be at the same time, invalidate too
> many objects (changing the tags on a node might have no influence on the way)
> or too few (you might want to invalidate near-by nodes). The dependency
> handling also works the same for all tables: it is the input object that gets
> recomputed for all tables.
>
> osm2pgsql needs a more flexible mechanism to handle dependent updates.
> Ideally the mechanism also allows to express transitive relationships: a
> change in OpenStreetMap triggers changes in table A, which in turn triggers
> updates in table B.
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