Could not fetch author data: null value in column "affiliation_country" of relation "journals_cachedauthor" violates not-null constraint DETAIL: Failing row contains (4761eb53-ae1d-46f2-a377-0fcda6b96c0f, A5101786091, Yan Feng, State Key Laboratory of Industrial Control Technology, 72, 903, 0000-0002-4601-4593, 2026-04-08 13:32:59.915183+00, 2026-04-08 13:32:59.915208+00, null, 18, 24, , ["Fault Detection and Control Systems", "Mineral Processing and ..., yan-feng-7).