Okay, I have found a fix, or at least a workaround.  If a Rails core
team member is reading this, I'd appreciate knowing if this warrants a
lighthouse ticket.

If I add a .reload (to the AR that is already in the db):

def load_station(candidate)
      if (incumbent =
WeatherStation.find_by_callsign(candidate.callsign))
        incumbent.resolve_location
        incumbent.save!
        incumbent.reload      # RELOAD ADDED HERE
      else
        candidate.resolve_location
        candidate.save!
        candidate
      end
    end

... it no longer raises an AssociationTypeMismatch in this code (called
some lines later):

PremiseWeatherStation.create(:premise => self, :weather_station =>
station)

Mind you, this ONLY happens when run as a server and not in the console.
(See the OP for the schema and models).  I'm going back to work on other
stuff, but if a Rails developer wants more information on this, I'd be
happy to provide it.

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