Delete row 477616 from events

seq 477616
id evt_74a4ef63f837
kind signal_candidate_ingest
ts 2026-04-22T01:02:27.838680+00:00
actor collector:discovery
subject_entity_ids []
payload {"created_at":"2026-04-22T01:02:27.838 ...
source_ref rss
confidence 1.0
dedupe_key discovery_unusual_volume_delta:c23ae15ca05c8fe1
episode_id NULL
created_at 2026-04-22T01:02:32.139763+00:00
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