Delete row 20806 from events

seq 20806
id evt_b47dfaa542fc
kind signal_ingest
ts 2026-04-11T01:41:15.867033+00:00
actor daemon:signal_enrichment
subject_entity_ids []
payload {"created_at":"2026-04-10T20:20:53.146 ...
source_ref candidate:sc_c274c2d6118365dd
confidence 0.7
dedupe_key signal_enriched:discovery_unusual_volume_delta:e0b ...
episode_id NULL
created_at 2026-04-11T01:41:15.867092+00:00
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