Is there any documentation for using Kartotherian Server with a vanilla/non OSM PostGIS database? The Kartotherian core documentation doesn't cover database connections or definitions of different parameters. Tilelive isn't too helpful either.
You need to install Mapbox Studio Classic, and create a new data source (tm2source) - write SQL queries in the studio - to pull that data into vector form, similar to how we do it in WMF tm2source Afterwards, create a new style (tm2) based on that data source, make sure the studio shows what you need, and point Kartotherian to both of these dirs - source1 (bridge) to tm2source, and source2 (vector) to tm2. Your source config would be similar to the sample. Mapbox studio classic uses the same components as Kartotherian, so if it works in one, it will work in the other.