Delete row 19 from invoices

id 19
trainer_id 10
student_id 15
invoice_no 2026-0004
category lesson
lines [{"service":"Einzelstunde 80 Min", ...
total_cents 11000
status paid
issued_at 2026-06-26 14:31:32
paid_at 2026-06-26 14:34:53
archived_at NULL
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