Delete row 86 from textbook_units

id 86
version_id yuwen_bubian_6x
unit_order 4
title 第四单元：古诗三首·十六年前的回忆·为人民服务·董存瑞舍身炸暗堡
unit_type regular
created_at 2026-06-18 03:49:12
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