Delete row 475107 from events

seq 475107
id evt_3aa1d7662188
kind signal_ingest
ts 2026-04-21T22:57:42.221772+00:00
actor daemon:signal_enrichment
subject_entity_ids []
payload {"created_at":"2026-04-20T20:32:04.855 ...
source_ref candidate:sc_423724463b76b57f
confidence 0.42
dedupe_key signal_enriched:discovery_ipo_delta:42f0c857de2e09 ...
episode_id NULL
created_at 2026-04-21T22:57:42.221826+00:00
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