Delete row 478466 from events

seq 478466
id evt_509a25f2271a
kind signal_ingest
ts 2026-04-22T03:16:15.264777+00:00
actor daemon:signal_enrichment
subject_entity_ids []
payload {"created_at":"2026-04-22T03:03:32.063 ...
source_ref candidate:sc_c2689e3c60d14cb3
confidence 0.62
dedupe_key signal_enriched:discovery_sec_filing_delta:8afdb1a ...
episode_id NULL
created_at 2026-04-22T03:16:15.264841+00:00
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