[25.01] Dealing with OSM building parts

We got feedback from Valencia about the building vs building:part in OSM. We have seen these occasions before (for example the Chilehaus in Hamburg), but for them the dataset is basically unusable, because of the overlapping geometries.

Therefore, we need to deal with them. Here are a few possibilities.

• Do not process any building:part and only have the coarse geometries
• Find a way to assign building:part to a full building and do not process this full building
• Do a spatial intersection of the full building with all its building parts?
• (Add each building:part to a different table)

It really depends on how building:part are actually mapped (in theory and in practice). In the case of Valencia, there's just a geometrical overlap, not a reference to the building OSM ID as relation.

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Update: The first step of identifying building parts is done in #56 (closed) and !44 (merged).

\rfc @all