rowid,zoom_level,tile_column,tile_row,tile_data
537,12,2013,2729,http://datasette-tiles.planning.data.gov.uk/ramsar/tiles/537.blob?_blob_column=tile_data
669,12,2012,2729,http://datasette-tiles.planning.data.gov.uk/ramsar/tiles/669.blob?_blob_column=tile_data