rowid,zoom_level,tile_column,tile_row,tile_data
53,9,247,338,http://datasette-tiles.planning.data.gov.uk/ramsar/tiles/53.blob?_blob_column=tile_data
57,9,246,338,http://datasette-tiles.planning.data.gov.uk/ramsar/tiles/57.blob?_blob_column=tile_data