Delete row 450684 from events

seq 450684
id evt_17cc7ce31d78
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_unusual_volume_delta:3eee259f472593d0
episode_id NULL
created_at 2026-04-20T15:42:16.434877+00:00
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