Delete row mock_seq_0053 from assignment_items

id mock_seq_0053
assignment_id asgn_cn_mock
child_id child_5b46b9f7
item_type short_answer
parent_id
sort_order 53
title 2. 结合时代背景，在第4自然段的横线上填写恰当的词语，使文章完整。
content answer_area
status pending
created_at 2026-06-14 08:07:16
updated_at 2026-06-14 08:07:16
major_index
ocr_major_title
major_score 0.0
subject chinese
section
options
correct_answer
image_idx 0
page_number 19
score 3.0
extra_content
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