[Tile-serving] [openstreetmap/osm2pgsql] Deprecate use of negative IDs (#1097)

[Paul Norman]

> But I am unsure whether this works correctly

I don't think they do.

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> Negative IDs are commonly used when handling external data that doesn't come from OSM.org but needs to be stored alongside public data with positive IDs for rendering or conflation purposes. It’s helpful to have an integer range that’s known to be free of legitimate OSM.org entities.

Are you doing this successfully with osm2pgsql? Have you evaluated if it works when the absolute value of an id conflicts? Does it work with updates?

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