Delete row 470547 from events

seq 470547
id evt_16926c9b2bed
kind signal_ingest
ts 2026-04-21T10:44:26.020655+00:00
actor daemon:signal_enrichment
subject_entity_ids []
payload {"created_at":"2026-04-21T03:09:54.871 ...
source_ref candidate:sc_4cc12d2be151cb48
confidence 0.72
dedupe_key signal_enriched:discovery_sec_filing_delta:589c59a ...
episode_id NULL
created_at 2026-04-21T10:44:26.020716+00:00
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