Delete row 18928 from events

seq 18928
id evt_1660a99df551
kind signal_ingest
ts 2026-04-10T18:45:37.583002+00:00
actor daemon:signal_enrichment
subject_entity_ids []
payload {"created_at":"2026-04-10T18:06:51.760 ...
source_ref candidate:sc_3ac0f832ea2fbb6a
confidence 0.7
dedupe_key signal_enriched:news_delta:3b7c42b3559903ed
episode_id NULL
created_at 2026-04-10T18:45:37.583072+00:00
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