Delete row 21 from invoices

id 21
trainer_id 11
student_id 10
invoice_no 2026-0009
category lesson
lines [{"service":"Schnupperkurs am 24.08.20 ...
total_cents 5900
status open
issued_at 2026-08-31 06:55:14
paid_at NULL
archived_at NULL
reminder1_at NULL
reminder2_at NULL
paid_method NULL
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