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e753603ec8
The guard proves that a migration appended to the end still runs on an install that is one version behind, by undoing what the last one did and replaying it. Its own comment asks whoever appends the next migration to re-point the undo, which is what this does: the trailing slot now clears the GB rows out of place_regions rather than creating journey_books. The Spanish row alongside it is there to catch the opposite mistake — a migration that clears more than its own country.