Delete row 470941 from events

seq 470941
id evt_252b88a29918
kind signal_candidate_ingest
ts 2026-04-21T12:20:48.730501+00:00
actor collector:discovery
subject_entity_ids []
payload {"created_at":"2026-04-21T12:20:48.730 ...
source_ref rss
confidence 1.0
dedupe_key discovery_ipo_delta:59e95d1dba2d686c
episode_id NULL
created_at 2026-04-21T12:20:50.337948+00:00
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