Delete row 16447 from events

seq 16447
id evt_03e54def59ca
kind signal_candidate_ingest
ts 2026-04-10T13:12:08.706840+00:00
actor collector:discovery
subject_entity_ids []
payload {"created_at":"2026-04-10T13:12:08.706 ...
source_ref rss
confidence 1.0
dedupe_key discovery_unusual_volume_delta:41416126bddcbc7e
episode_id NULL
created_at 2026-04-10T13:12:12.466748+00:00
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