TAR-KU: Temporal-Aware Risk-Constrained Knowledge Updating for High-Recall Political Text Correction

Political texts contain time-sensitive facts about people, offices, institutions, places, and official terminology. A knowledge base that is merely expanded with newly retrieved material may improve coverage, but it can also introduce entity confusion, outdated facts, conflicting evidence, and unjustified edits. This paper presents TAR-KU, a temporal-aware risk-constrained knowledge updating method for high-recall political text correction. TAR-KU separates knowledge admission from correction authorization. Incremental materials are first converted into candidate records, then checked through entity-relation alignment, temporal validity modeling, source-evidence aggregation, conflict governance, and version snapshots. Only records that satisfy the query-time authorization conditions are allowed to support local edits. This design preserves historical knowledge while making newly verified facts available to downstream correction. Experiments on 688 political-text samples, together with an independent 128-sample source set and a 100-sample clean control set, compare TAR-KU with retrieval, memory, parameter-editing, snapshot, and prompt-update baselines. TAR-KU achieves 83.19% correction precision, 87.59% correction recall, and 85.34% F1, obtaining the highest recall and F1 among the compared methods, at an average latency of 4.07 s. Updating the knowledge state increases recall from 85.63% to 87.59% and correct edits from 566 to 579. The results show that TAR-KU improves dynamic-fact coverage while preserving an explicit boundary between evidence availability and automatic modification.