Delete row 177726 from events

seq 177726
id evt_411064936448
kind signal_ingest
ts 2026-04-18T11:13:12.258615+00:00
actor daemon:signal_enrichment
subject_entity_ids []
payload {"created_at":"2026-04-18T11:11:26.670 ...
source_ref candidate:sc_1e61f5aeddf2f136
confidence 0.74
dedupe_key signal_enriched:discovery_unusual_volume_delta:992 ...
episode_id NULL
created_at 2026-04-18T11:13:12.258692+00:00
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