[Tile-serving] [openstreetmap/osm2pgsql] osm2pgsql hungs forever while applying version-merged minutely changeset 003/425/025 (#925)

[tb]

I downloaded the minutely changeset 003/425/025.osc.gz and merged eventually existing multiple versions (see [issue #921](https://github.com/openstreetmap/osm2pgsql/issues/921)) by using `osmconvert`:
`osmconvert --out-o5c --merge-versions /mnt/scratch/obm/changesets/003/409/417.osc.gz` into an `o5c` file.
When i try to apply this to my database, the `osm2pgsql (version 0.96.0 (64 bit id space))` command hangs forever by fully using one core:
```
osm2pgsql --verbose --append --slim --cache 16384 \
--style ../import/osm2pgsql/minimal.style --database gis \
--hstore --multi-geometry --latlong --extra-attributes \
--flat-nodes /mnt/osm_data/flat_nodes/flat_nodes \
--number-processes 4 --cache-strategy dense \
/mnt/scratch/obm/changesets/003/425/025.clean.o5c
```
The last output line is:
`Processing: Node(1k 1.8k/s) Way(0k 0.94k/s) Relation(10 10.00/s)`

This happens on two different machines.

I neither tried another format of the merged changeset nor another tool for creating the merged changeset yet.
I'm happy to provide more info if you let me know what you need and how can i do this ;)

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