Delete row 21 from invoices

id 21
trainer_id 10
student_id 17
invoice_no 2026-0006
category lesson
lines [{"service":"Stunde auf dem Platz" ...
total_cents 12000
status open
issued_at 2026-06-26 14:33:37
paid_at NULL
archived_at 2026-06-26 14:34:02
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