[Tile-serving] [openstreetmap/osm2pgsql] Save unprojected coordinates in node caches and use osmium dense file array (#668)

[Paul Norman]

> Yes, I would like that but I'm not sure how to do it. How about adding an additional table that holds a schema version? This would allow us to create better error reporting and also to write automatic migrations in the future.

I'd be in favour of this going forwards, but I'm not sure it's the best option for **this** issue. Looking at the schema, we have the column `tags text[]` with node tags. We don't need this information, and flat nodes doesn't have it. If we dropped that column it would break compatibility (and save space).


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