protected static List<String> mergeLocations(
            final List<String> locations1,
            final List<String> locations2) {
        return Stream.concat(
                        NullSafe.list(locations1).stream(),
                        NullSafe.list(locations2).stream())
                .filter(Objects::nonNull)
                .toList();
    }
Combine two lists of flyway migration locations
stroom-db-util/src/main/java/stroom/db/util/AbstractFlyWayDbModule.java