Delete row 8 from invoices

id 8
trainer_id 5
student_id 6
invoice_no 2026-0001
category lesson
lines [{"service":"Einzelstunde","se ...
total_cents 8000
status open
issued_at 2026-08-06 15:11:00
paid_at NULL
archived_at NULL
reminder1_at NULL
reminder2_at NULL
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