Delete row 471993 from events

seq 471993
id evt_4b680e43e7ea
kind signal_candidate_ingest
ts 2026-04-21T16:48:38.963204+00:00
actor collector:discovery
subject_entity_ids []
payload {"created_at":"2026-04-21T16:48:38.963 ...
source_ref rss
confidence 1.0
dedupe_key discovery_options_flow_delta:6eccacf621489283
episode_id NULL
created_at 2026-04-21T16:48:42.378559+00:00
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