Delete row 15 from invoices

id 15
trainer_id 10
student_id 15
invoice_no 2026-DEMO-001
category card
lines [{"service":"10er-Karte Einzelstunde&# ...
total_cents 67500
status paid
issued_at 2026-05-12 13:44:24
paid_at 2026-05-14 13:44:24
archived_at NULL
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