Delete row 450710 from events

seq 450710
id evt_b1afe2f95e93
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_sector_rotation_delta:b7bb4d3024216708
episode_id NULL
created_at 2026-04-20T15:42:17.800970+00:00
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