Delete row 20 from invoices

id 20
trainer_id 11
student_id 10
invoice_no 2026-0008
category video_analysis
lines [{"service":"Schwunganalyse zur Stunde ...
total_cents 599
status open
issued_at 2026-08-19 14:23:06
paid_at NULL
archived_at NULL
reminder1_at NULL
reminder2_at NULL
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