[Tile-serving] [openstreetmap/osm2pgsql] Combining multiple sets of themes (Discussion #2078)

[Paul Norman]

I'm wondering how to combine multiple configs best, without conflicting. The current way of creating one config with all the topics can have problems. Two configs could conflict in two ways
- they could create tables of the same name. This is best handled through schemas
- They could modify the objects, causing configs used later to fail. I'm not sure how to handle this.



For the schemas, `themepark:set_option` allows setting the schema, but only before any topics are added. Maybe a scheme parameter to the add_topic function would allow combining?

For the latter, I'm not sure how to handle it.

Better yet would be a way to take two config files and combine the two automatically, rather than making one config file with all the topics.

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