Delete row 478504 from events

seq 478504
id evt_f2f27fc0b7f3
kind signal_ingest
ts 2026-04-22T03:18:31.332294+00:00
actor daemon:signal_enrichment
subject_entity_ids []
payload {"created_at":"2026-04-22T03:03:32.063 ...
source_ref candidate:sc_d2aa1b9aabf83a90
confidence 0.74
dedupe_key signal_enriched:discovery_sec_filing_delta:ba1422d ...
episode_id NULL
created_at 2026-04-22T03:18:31.332367+00:00
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