Delete row 454234 from events

seq 454234
id evt_21f3a8394b23
kind signal_ingest
ts 2026-04-20T16:36:24.157864+00:00
actor daemon:signal_enrichment
subject_entity_ids []
payload {"created_at":"2026-04-20T16:27:42.356 ...
source_ref candidate:sc_1d8ac899f363c738
confidence 0.42
dedupe_key signal_enriched:news_delta:52f034d7629abcb9
episode_id NULL
created_at 2026-04-20T16:36:24.160536+00:00
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