Delete row 477497 from events

seq 477497
id evt_217116c30364
kind signal_ingest
ts 2026-04-22T00:21:35.546733+00:00
actor daemon:signal_enrichment
subject_entity_ids []
payload {"created_at":"2026-04-22T00:01:09.681 ...
source_ref candidate:sc_640e4c021ccd6abf
confidence 0.42
dedupe_key signal_enriched:discovery_ipo_delta:1e6e0054f4d8df ...
episode_id NULL
created_at 2026-04-22T00:21:35.546803+00:00
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