Delete row 450654 from events

seq 450654
id evt_cd3289ff81f1
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:fb214ca634bdfc19
episode_id NULL
created_at 2026-04-20T15:42:15.156889+00:00
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