[Tile-serving] [openstreetmap/osm2pgsql] Timestamp of last change of object in database (#923)

[tb]

> @mmd-osm you're right, timestamp is indeed provided in extracts.
> This should cover 99% of use cases.

You need to be careful about osm_timestamp. In the case of updating the database changing the coordinates of a point used by a polygon, the osm_timestamp of the polygon will not be changed, but the geometry in the <prefix>_polygon table will be.

But - if i get the request right - this can easily be achieved by a before-insert-trigger in the database, i'd suggest to spare this out in osm2pgsql anyway.


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