Delete row 479968 from events

seq 479968
id evt_491df3648f83
kind signal_candidate_ingest
ts 2026-04-22T09:08:08.862046+00:00
actor collector:discovery
subject_entity_ids []
payload {"created_at":"2026-04-22T09:08:08.862 ...
source_ref rss
confidence 1.0
dedupe_key discovery_ipo_delta:cb9ffe6f929f71fb
episode_id NULL
created_at 2026-04-22T09:08:12.767398+00:00
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