[Tile-serving] [openstreetmap/osm2pgsql] Updating a db leads to: node-persistent-cache.cpp:369: void node_persistent_cache::set_append(osmid_t, double, double): Assertion `!read_mode' failed.` (#743)

[Paul Norman]

Nothing obvious is jumping out at me from the command line. How was changes.osc.gz generated? Can you paste `zcat changes.osc.gz | head -n 30`

I'd start by trying with --number-processes 1 and without --expire tiles. Neither of these is likely to be a cause, but `--expire-tiles` isn't **required** to do the update and single process is easier to debug. 

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https://github.com/openstreetmap/osm2pgsql/blob/0.92.0/node-persistent-cache.cpp#L369 is the assertion, being called from https://github.com/openstreetmap/osm2pgsql/blob/0.92.0/node-persistent-cache.cpp#L390. That is either called from https://github.com/openstreetmap/osm2pgsql/blob/0.92.0/middle-pgsql.cpp#L387 or https://github.com/openstreetmap/osm2pgsql/blob/0.92.0/middle-pgsql.cpp#L415 depending on if it's a node create/modify or a delete.

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