Delete row 5 from textbook_texts

id 5
lesson_id 5
content 一二三四五，\n金木水火土。\n天地分上下，\n日月照今古。
paragraphs ["一二三四五，", "金木水火土。", "天地分上下，&# ...
word_count 20
created_at 2026-06-18 03:50:39
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