Delete row 55817 from events

seq 55817
id evt_9fc0621ce0e9
kind signal_candidate_ingest
ts 2026-04-16T08:14:25.857765+00:00
actor collector:discovery
subject_entity_ids []
payload {"created_at":"2026-04-16T08:14:25.857 ...
source_ref rss
confidence 1.0
dedupe_key discovery_unusual_volume_delta:71ed2bc4dec891af
episode_id NULL
created_at 2026-04-16T08:14:30.992485+00:00
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