Delete row 20474 from events

seq 20474
id evt_9c6bbc2e044b
kind signal_candidate_ingest
ts 2026-04-11T00:11:50.548611+00:00
actor collector:discovery
subject_entity_ids []
payload {"created_at":"2026-04-11T00:11:50.548 ...
source_ref rss
confidence 1.0
dedupe_key discovery_ipo_delta:db1dbd0965e4ce81
episode_id NULL
created_at 2026-04-11T00:11:52.394847+00:00
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