Delete row 473745 from events

seq 473745
id evt_fa1884e92f35
kind signal_ingest
ts 2026-04-21T22:08:29.568624+00:00
actor daemon:signal_enrichment
subject_entity_ids []
payload {"created_at":"2026-04-21T03:09:54.871 ...
source_ref candidate:sc_204f581ff386c980
confidence 0.78
dedupe_key signal_enriched:discovery_unusual_volume_delta:1c5 ...
episode_id NULL
created_at 2026-04-21T22:08:29.568684+00:00
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