Junction type is fixed enum value

api/s2_junctions.py

@@ -53,7 +53,7 @@ def delete_junction(name: str, id: str) -> ChangeSet:
         cur.execute(sql)
 
         redo = sql.replace("'", '"')
-        undo = f'insert into _node (id, type) values ("{id}", "{type}");'
+        undo = f'insert into _node (id, type) values ("{id}", "JUNCTION");'
         undo += f" insert into junctions (id, elevation, demand, pattern) values ('{id}', {elevation}, {demand}, {pattern});"
         undo += f"  insert into coordinates (node, coord) values ('{id}', '{coord}');"
         add_operation(name, redo, undo)