rowid,zoom_level,tile_column,tile_row,tile_data
4281,15,16415,22111,http://datasette-tiles.planning.data.gov.uk/ramsar/tiles/4281.blob?_blob_column=tile_data
6111,15,16414,22111,http://datasette-tiles.planning.data.gov.uk/ramsar/tiles/6111.blob?_blob_column=tile_data