[Tile-serving] [openstreetmap/osm2pgsql] Index only mode (#799)

[sav123]

These timing are too high and you don't use [lua filtering](https://github.com/openstreetmap/osm2pgsql/issues/801). Anyway, it is needed to exclude useless data. When you run with flatnodes, don't spend the memory needed by Postgres, use the default or less.

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