Delete row 470970 from events

seq 470970
id evt_6d8ac77eec16
kind signal_candidate_ingest
ts 2026-04-21T12:20:48.730501+00:00
actor collector:discovery
subject_entity_ids []
payload {"created_at":"2026-04-21T12:20:48.730 ...
source_ref rss
confidence 1.0
dedupe_key discovery_unusual_volume_delta:b2703ae8952fa1a7
episode_id NULL
created_at 2026-04-21T12:20:51.512469+00:00
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