Delete row 475746 from events

seq 475746
id evt_91f88f4c03ee
kind signal_ingest
ts 2026-04-21T23:22:42.604775+00:00
actor daemon:signal_enrichment
subject_entity_ids []
payload {"created_at":"2026-04-21T19:57:20.275 ...
source_ref candidate:sc_129770fa44bc7d51
confidence 0.7
dedupe_key signal_enriched:discovery_unusual_volume_delta:0ed ...
episode_id NULL
created_at 2026-04-21T23:22:42.604811+00:00
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