Delete row 477821 from events

seq 477821
id evt_b8f4dd2c0072
kind signal_candidate_ingest
ts 2026-04-22T02:02:59.137029+00:00
actor collector:discovery
subject_entity_ids []
payload {"created_at":"2026-04-22T02:02:59.137 ...
source_ref rss
confidence 1.0
dedupe_key discovery_unusual_volume_delta:67c920eefec935f8
episode_id NULL
created_at 2026-04-22T02:03:03.925453+00:00
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