Delete row 478535 from events

seq 478535
id evt_6e81158ddc72
kind signal_ingest
ts 2026-04-22T03:20:32.381742+00:00
actor daemon:signal_enrichment
subject_entity_ids []
payload {"created_at":"2026-04-22T03:03:32.063 ...
source_ref candidate:sc_b500f9f72daebb82
confidence 0.78
dedupe_key signal_enriched:discovery_sec_filing_delta:bae711e ...
episode_id NULL
created_at 2026-04-22T03:20:32.381796+00:00
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