Delete row 438715 from events

seq 438715
id evt_c19fb20345ce
kind signal_ingest
ts 2026-04-20T13:15:57.306219+00:00
actor daemon:signal_enrichment
subject_entity_ids []
payload {"created_at":"2026-04-20T13:10:00.946 ...
source_ref candidate:sc_40762b2882c8f4ae
confidence 0.42
dedupe_key signal_enriched:discovery_ipo_delta:2c24a3f21ba75b ...
episode_id NULL
created_at 2026-04-20T13:15:57.306285+00:00
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