Delete row child_b9afa3ab from children

id child_b9afa3ab
nickname 机构新生
grade 小学二年级
avatar NULL
tags NULL
created_at 2026-06-08 06:43:53
updated_at 2026-06-08 06:43:53
device_id test_jwt_inst
phone 15500000001
institution_id inst_bc_ai_lab
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