maintenance: consider station renames whan backpropagating polylines

				exit(1);

			}

		}

		else {

			while ( my ( $old_name, $new_name )

				= each %{ $self->app->renamed_station } )

			{

				$journey->{route} =~ s{"\Q$old_name\E"}{"$new_name"};

			}

			my $ref = $db->select(

				'journeys',

				[ 'id', 'polyline_id' ],

				{

					route       => $journey->{route},

					polyline_id => { '!=', undef },

					edited      => 0,

				},

				{ limit => 1 }

			)->hash;

			if ($ref) {

				my $rows = $db->update(

					'journeys',

					{ polyline_id => $ref->{polyline_id} },

					{ id          => $journey->{id} }

				)->rows;

				if ( $rows != 1 ) {

					say STDERR

"Database update returned $rows rows, expected 1. Rollback and abort.";

					exit(1);

				}

			}

		}

	}

	my $remaining