rowid,zoom_level,tile_column,tile_row,tile_data
15,7,63,87,http://datasette-tiles.planning.data.gov.uk/ramsar/tiles/15.blob?_blob_column=tile_data
17,7,62,87,http://datasette-tiles.planning.data.gov.uk/ramsar/tiles/17.blob?_blob_column=tile_data