Vous aviez raison, voici l’erreur précédente :
ERROR: could not create unique index "index_tags_on_lower_name"
DETAIL: Key (lower(name::text))=(زبا�) is duplicated.
EXCEPTION: psql failed: DETAIL: Key (lower(name::text))=(زبا�) is duplicated.
Ce qui, je suppose, a déjà été signalé ici : Can't restore due to corrupt indexes (with some clues on how to deal with corrupt indexes) et ici There are some duplicated tags due to database corruption and I can't merge .