Delete row 478903 from events

seq 478903
id evt_60940548bf00
kind signal_ingest
ts 2026-04-22T03:56:33.944955+00:00
actor daemon:signal_enrichment
subject_entity_ids []
payload {"created_at":"2026-04-22T03:55:58.214 ...
source_ref candidate:sc_2d91c7704b31f05e
confidence 0.42
dedupe_key signal_enriched:news_delta:8689236a397865af
episode_id NULL
created_at 2026-04-22T03:56:33.945012+00:00
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