Delete row 475727 from events

seq 475727
id evt_67842ca0a470
kind signal_ingest
ts 2026-04-21T23:21:20.833086+00:00
actor daemon:signal_enrichment
subject_entity_ids []
payload {"created_at":"2026-04-21T19:57:20.275 ...
source_ref candidate:sc_68c12576c4f919b6
confidence 0.55
dedupe_key signal_enriched:discovery_unusual_volume_delta:afc ...
episode_id NULL
created_at 2026-04-21T23:21:20.833150+00:00
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