Delete row 473477 from events

seq 473477
id evt_13ca5817f8c4
kind signal_candidate_ingest
ts 2026-04-21T21:31:18.735453+00:00
actor collector:discovery
subject_entity_ids []
payload {"created_at":"2026-04-21T21:31:18.735 ...
source_ref rss
confidence 1.0
dedupe_key discovery_sector_rotation_delta:93acdedd49ec853e
episode_id NULL
created_at 2026-04-21T21:31:25.231255+00:00
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