(Of course, it'll probably just work the first time now...)

The export process is already robust at a coarse level: the dump is retained on disk and the process can be retried at the "upload the whole file again" level, then picked up with bin/host export using the --database or --database-file flags (probably with --keep-file).

The (anonymized) error the process encountered occurred while transferring the dump to central storage was:

Per above, this was partially mooted by the house framing rotting and partially resolved by me being generally pretty satisfied with the "Stop or Prop".

These are still stuck in a manufacturing backlog.

About a year later, I still like PCB manufacturing in theory, but haven't actually manufactured any more PCBs.

A year or so later:

I redid the clogged sink according to the schema above and haven't had any issues with it so far. I think this is probably an approximately reasonable map for tackling plumbing problems that might arise in the future.