Delete row 473749 from events

seq 473749
id evt_39e24820d635
kind signal_ingest
ts 2026-04-21T22:08:35.529682+00:00
actor daemon:signal_enrichment
subject_entity_ids []
payload {"created_at":"2026-04-21T10:00:50.797 ...
source_ref candidate:sc_efd8699d9184c68d
confidence 0.42
dedupe_key signal_enriched:news_delta:23a06f1ac2b5f847
episode_id NULL
created_at 2026-04-21T22:08:35.529751+00:00
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