rowid,zoom_level,tile_column,tile_row,tile_data
4530,15,16531,21978,http://datasette-tiles.planning.data.gov.uk/ramsar/tiles/4530.blob?_blob_column=tile_data
10975,15,16532,21978,http://datasette-tiles.planning.data.gov.uk/ramsar/tiles/10975.blob?_blob_column=tile_data