Delete row mock_seq_0007 from assignment_items

id mock_seq_0007
assignment_id asgn_cn_mock
child_id child_5b46b9f7
item_type major
parent_id
sort_order 7
title
content
status pending
created_at 2026-06-14 08:07:16
updated_at 2026-06-14 08:07:16
major_index 二
ocr_major_title 二、查字典填空
major_score 5.0
subject chinese
section
options
correct_answer
image_idx 0
page_number 17
score 0.0
extra_content
description NULL
media_urls NULL
supplement_urls NULL
expected_answer NULL
group_id NULL
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