Delete row 478620 from events

seq 478620
id evt_5757bf73edbb
kind signal_ingest
ts 2026-04-22T03:24:56.721551+00:00
actor daemon:signal_enrichment
subject_entity_ids []
payload {"created_at":"2026-04-22T03:03:32.063 ...
source_ref candidate:sc_d165c87e12131736
confidence 0.72
dedupe_key signal_enriched:discovery_sec_filing_delta:5fe67e6 ...
episode_id NULL
created_at 2026-04-22T03:24:56.721614+00:00
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