Delete row 478936 from events

seq 478936
id evt_92141fcb8e8c
kind signal_ingest
ts 2026-04-22T04:05:07.029043+00:00
actor collector:discovery
subject_entity_ids []
payload {"created_at":"2026-04-22T04:05:03.222 ...
source_ref rss
confidence 1.0
dedupe_key discovery_unusual_volume_snapshot:f1473c28de84bd15
episode_id NULL
created_at 2026-04-22T04:05:07.029135+00:00
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