[Tile-serving] [openstreetmap/osm2pgsql] duplicate key error in slim mode (#16)

[ReckyXXX]

You can import merged file as @iqqmuT  says, but it will dropped already loaded map-data in PostgreDatabase and start new import process.

On the other hand, you can substract already existing data from new region file using:
```
osmconvert new_region.pbf -o=new_region.o5m
osmconvert already_loaded_map.pbf -o=already_loaded_map.o5m
osmconvert new_region.o5m --subtract already_loaded_map.o5m -o=new_region_cleaned.o5m
osmconvert new_region_cleaned.o5m -o=new_region_cleaned.pbf
```
And then you can just append new file to PostgreSQL using:
`osm2pgsql --append ...  new_region_cleaned.pbf`
without duplicate key errors.

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