Delete row 39 from invoices

id 39
trainer_id 2
student_id 26
invoice_no 2026-0013
category lesson
lines [{"service":"Einzelstunde am 09.09.202 ...
total_cents 7000
status open
issued_at 2026-09-09 12:00:13
paid_at NULL
archived_at NULL
reminder1_at NULL
reminder2_at NULL
paid_method NULL
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