Delete row 15 from invoices

id 15
trainer_id 11
student_id 10
invoice_no 2026-0003
category lesson
lines [{"service":"Einzelstunde 100", ...
total_cents 12000
status open
issued_at 2026-08-17 18:38:41
paid_at NULL
archived_at NULL
reminder1_at NULL
reminder2_at NULL
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