rowid,zoom_level,tile_column,tile_row,tile_data
244,11,1007,1394,http://datasette-tiles.planning.data.gov.uk/ramsar/tiles/244.blob?_blob_column=tile_data
273,11,1006,1394,http://datasette-tiles.planning.data.gov.uk/ramsar/tiles/273.blob?_blob_column=tile_data