Delete row 450645 from events

seq 450645
id evt_a50413a451d6
kind signal_candidate_ingest
ts 2026-04-20T15:42:12.815098+00:00
actor collector:discovery
subject_entity_ids []
payload {"created_at":"2026-04-20T15:42:12.815 ...
source_ref rss
confidence 1.0
dedupe_key discovery_ipo_delta:1f0b295755a3d2aa
episode_id NULL
created_at 2026-04-20T15:42:14.936658+00:00
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