Delete row 4 from invoices

id 4
trainer_id 1
student_id 2
invoice_no 2026-0003
category lesson
lines [{"service":"Einzelstunde am 27.07.202 ...
total_cents 5900
status open
issued_at 2026-07-24 20:54:03
paid_at NULL
archived_at NULL
reminder1_at NULL
reminder2_at NULL
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