"time location-importer --debug --database-host=x --database-name=x --database-username=x --database-password=x write test.db" currently returns:

Traceback (most recent call last):
  File "/usr/bin/location-importer", line 1043, in <module>
    main()
  File "/usr/bin/location-importer", line 1041, in main
    c.run()
  File "/usr/bin/location-importer", line 128, in run
    ret = args.func(args)
  File "/usr/bin/location-importer", line 322, in handle_write
    network = writer.add_network(row.network)
SystemError: <method 'add_network' of 'location.Writer' objects> returned NULL without setting an error                                                                                      

real    98m2.451s
user    1m4.284s
sys     0m0.977s

This is kind of a show-stopper as it prevents me from resolving #12499 et al., since I have no idea how big the database will become and how long the entire export process will take.

My suggestion of this is to be affecting location01 as well.