Delete row 481922 from events

seq 481922
id evt_068160462665
kind signal_ingest
ts 2026-04-22T13:58:18.610229+00:00
actor daemon:signal_enrichment
subject_entity_ids []
payload {"created_at":"2026-04-22T13:57:43.567 ...
source_ref candidate:sc_d9c06f24d4fb9192
confidence 0.28
dedupe_key signal_enriched:market_headline_delta:93fe7d575c8e ...
episode_id NULL
created_at 2026-04-22T13:58:18.621348+00:00
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