Delete row 56781 from events

seq 56781
id evt_84855cc97935
kind signal_ingest
ts 2026-04-16T11:17:12.584828+00:00
actor daemon:signal_enrichment
subject_entity_ids []
payload {"created_at":"2026-04-16T11:16:12.965 ...
source_ref candidate:sc_0f86ca2efcda5890
confidence 0.62
dedupe_key signal_enriched:discovery_unusual_volume_delta:650 ...
episode_id NULL
created_at 2026-04-16T11:17:12.584886+00:00
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