Delete row 189984 from events

seq 189984
id evt_c8bbb09055d6
kind signal_ingest
ts 2026-04-18T13:14:14.729973+00:00
actor daemon:signal_enrichment
subject_entity_ids []
payload {"created_at":"2026-04-18T13:13:35.877 ...
source_ref candidate:sc_e534e2e17f6e521a
confidence 0.72
dedupe_key signal_enriched:discovery_unusual_volume_delta:977 ...
episode_id NULL
created_at 2026-04-18T13:14:14.730019+00:00
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