Delete row 423869 from events

seq 423869
id evt_b2ac46699871
kind signal_ingest
ts 2026-04-20T10:54:13.333688+00:00
actor daemon:signal_enrichment
subject_entity_ids []
payload {"created_at":"2026-04-20T10:53:49.852 ...
source_ref candidate:sc_18ce97154579b050
confidence 0.28
dedupe_key signal_enriched:market_headline_delta:637ea93ae303 ...
episode_id NULL
created_at 2026-04-20T10:54:13.333753+00:00
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