[Tile-serving] [openstreetmap/osm2pgsql] How does osm2pgsql --append handles duplicates while updating diff files (Discussion #1974)

[wgds60]

If the changes.osc.gz file include e.g. osm_ids that are already in the database, how does osm2pgsql handle those updates?

Older versions (pre 0.9x e.g.?) had been throwing errors if an input file had duplicates (e.g. adding another region via --append instead of merging and deduplicating input files) if I remember this correctly.

But how does osm2pgsql e.g. handle the situation where a diff is applied for the last 12 hours while the db is only 4 hours behind?

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