[Tile-serving] [openstreetmap/osm2pgsql] --append is not working properly (data is deleted when it shouldn't) (#938)

[Sarah Hoffmann]

You never should do updates by date. Always continue them according to the sequence id. No idea how this works with osmupdate. I usually use pyosmium which does all the handling of sequence numbers for you, see [this section in its manual](https://docs.osmcode.org/pyosmium/latest/updating_osm_data.html#creating-change-files-for-updating-databases).

This clearly isn't a problem with osm2pgsql but with your update process, so closing the issue.

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