[Tile-serving] [osm2pgsql] unique ids - force (#446)

[mboeringa]

> add line: "split_at = 100000000000;" : #33 (comment)

I think there may potentially be very negative consequences of adding that line. Having huge geometries with thousands or even millions of vertices in a single geometry database record, might cause serious performance issues later on when using the data in a GIS or rendering application.

Of course @pnorman is the expert here, but huge geometries can definitely be a pain in any geographic database. I don't think it is without reason the default setup handles these geometries / relations as it does (reducing their impact by splitting them up or distributing individual parts of a multi-polygon over multiple database records).

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https://github.com/openstreetmap/osm2pgsql/issues/446#issuecomment-137405763
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