Delete row child_b6420f7b from children

id child_b6420f7b
nickname 张同学
grade 小学三年级
avatar NULL
tags NULL
created_at 2026-06-08 06:40:05
updated_at 2026-06-08 06:40:05
device_id test_dev_18800000001
phone 18800000001
institution_id inst_bc_ai_lab
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