Seguí estos pasos y renombré correctamente al usuario duplicado. Pero luego encontré este problema al intentar volver a indexar.
@sam había sugerido en ese hilo: “Sí, por favor, elimina las filas duplicadas”, pero no sé qué significa eso en el contexto de las advertencias y los mensajes de error que obtengo al volver a indexar, lo cual ahora ha crecido hasta convertirse en:
REINDEX SCHEMA CONCURRENTLY public;
WARNING: cannot reindex invalid index "public.index_incoming_referers_on_path_and_incoming_domain_id_ccnew" concurrently, skipping
WARNING: cannot reindex invalid index "public.incoming_referers_pkey_ccnew1" concurrently, skipping
WARNING: cannot reindex invalid index "public.index_incoming_referers_on_path_and_incoming_domain_id_ccnew1" concurrently, skipping
WARNING: cannot reindex invalid index "public.index_incoming_referers_on_path_and_incoming_domain_id_cc_ccnew" concurrently, skipping
WARNING: cannot reindex invalid index "public.index_incoming_referers_on_path_and_incoming_domain_id_c_ccnew1" concurrently, skipping
WARNING: cannot reindex invalid index "public.incoming_referers_pkey_ccnew2" concurrently, skipping
WARNING: cannot reindex invalid index "public.index_incoming_referers_on_path_and_incoming_domain_id_ccnew2" concurrently, skipping
WARNING: cannot reindex invalid index "public.incoming_referers_pkey_ccnew_ccnew" concurrently, skipping
WARNING: cannot reindex invalid index "pg_toast.pg_toast_19250_index_ccnew1" concurrently, skipping
WARNING: cannot reindex invalid index "pg_toast.pg_toast_19250_index_ccnew2" concurrently, skipping
WARNING: cannot reindex invalid index "pg_toast.pg_toast_19250_index_ccnew_ccnew" concurrently, skipping
ERROR: could not create unique index "index_incoming_referers_on_path_and_incoming_domain_id_ccnew3"
DETAIL: Key (path, incoming_domain_id)=(/votes/, 1165) is duplicated.