this is a SQLite database container for map tiles with two tables Tiles and Metadata (some implementations have tiles as a view)
The tiles are always in 3857 Web Mercator/Auxillary Websphere.
✓ Raster Tiles – jpg, png, webp
✓ Vector Tiles – GZ (PBF protocol buffer format)
User vector tiles should be 1 layer only so we can apply style to the data. Possibly in the future we can support vector tiles with multiple layers