Delete row 228511 from events

seq 228511
id evt_31d74284aaef
kind signal_ingest
ts 2026-04-18T19:56:54.348545+00:00
actor daemon:signal_enrichment
subject_entity_ids []
payload {"created_at":"2026-04-18T18:48:29.555 ...
source_ref candidate:sc_a0574f0697eba3d1
confidence 0.78
dedupe_key signal_enriched:discovery_unusual_volume_delta:c62 ...
episode_id NULL
created_at 2026-04-18T19:56:54.348590+00:00
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