Could not fetch author data: null value in column "affiliation_country" of relation "journals_cachedauthor" violates not-null constraint DETAIL: Failing row contains (f9b08dc3-2151-46d9-9889-f90fbcc6ca23, A5047097530, Vikram Duvvuri, Instituto Superior Técnico, 6, 2936, , 2026-04-21 05:22:21.036966+00, 2026-04-21 05:22:21.036981+00, null, 4, 4, , ["Cosmology and Gravitation Theories", "Black Holes and Theoreti..., vikram-duvvuri).