rowid,zoom_level,tile_column,tile_row,tile_data
6231,15,16118,21855,http://datasette-tiles.planning.data.gov.uk/ramsar/tiles/6231.blob?_blob_column=tile_data
9566,15,16118,21856,http://datasette-tiles.planning.data.gov.uk/ramsar/tiles/9566.blob?_blob_column=tile_data