Delete row 470258 from events

seq 470258
id evt_4e2aa53c4b2b
kind signal_candidate_ingest
ts 2026-04-21T09:16:05.409385+00:00
actor collector:discovery
subject_entity_ids []
payload {"created_at":"2026-04-21T09:16:05.409 ...
source_ref rss
confidence 1.0
dedupe_key discovery_ipo_delta:b5efdef1d965834b
episode_id NULL
created_at 2026-04-21T09:16:07.220047+00:00
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