Delete row mock_seq_0051 from assignment_items

id mock_seq_0051
assignment_id asgn_cn_mock
child_id child_5b46b9f7
item_type major
parent_id
sort_order 51
title
content 在长征途中，我们连的炊事班一直跟随在队伍后面。一路上，他们不仅要顶着风雨前进，还要在宿营时生火做饭， ...
status pending
created_at 2026-06-14 08:07:16
updated_at 2026-06-14 08:07:16
major_index 九
ocr_major_title 九、课外阅读
major_score 16.0
subject chinese
section
options
correct_answer
image_idx 0
page_number 19
score 0.0
extra_content
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