Delete row 450690 from events

seq 450690
id evt_b173942671b5
kind signal_ingest
ts 2026-04-20T15:42:16.455895+00:00
actor collector:discovery
subject_entity_ids []
payload {"created_at":"2026-04-20T15:42:12.812 ...
source_ref rss
confidence 1.0
dedupe_key discovery_unusual_volume_snapshot:a3263ef509e57ca6
episode_id NULL
created_at 2026-04-20T15:42:16.455975+00:00
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