Delete row 478921 from events

seq 478921
id evt_81ced56021a1
kind signal_candidate_ingest
ts 2026-04-22T04:05:03.223061+00:00
actor collector:discovery
subject_entity_ids []
payload {"created_at":"2026-04-22T04:05:03.223 ...
source_ref rss
confidence 1.0
dedupe_key discovery_ipo_delta:2815cb5b187a99b1
episode_id NULL
created_at 2026-04-22T04:05:05.037261+00:00
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