Delete row 57454 from events

seq 57454
id evt_c1b46310e549
kind signal_ingest
ts 2026-04-16T13:26:03.241239+00:00
actor daemon:signal_enrichment
subject_entity_ids []
payload {"created_at":"2026-04-16T13:18:26.594 ...
source_ref candidate:sc_926a0dc4430ac054
confidence 0.42
dedupe_key signal_enriched:discovery_ipo_delta:39c36b54acefd6 ...
episode_id NULL
created_at 2026-04-16T13:26:03.241298+00:00
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