Delete row 482480 from events

seq 482480
id evt_48fa074958cf
kind signal_ingest
ts 2026-04-22T15:51:11.641500+00:00
actor daemon:signal_enrichment
subject_entity_ids []
payload {"created_at":"2026-04-22T15:21:13.336 ...
source_ref candidate:sc_02d12252068bcb97
confidence 0.74
dedupe_key signal_enriched:discovery_unusual_volume_delta:a3b ...
episode_id NULL
created_at 2026-04-22T15:51:11.641555+00:00
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