Delete row 257 from events

seq 257
id evt_299ae8dfd8f4
kind signal_candidate_ingest
ts 2026-04-07T23:23:54.391414+00:00
actor collector:discovery
subject_entity_ids []
payload {"created_at":"2026-04-07T23:23:54.391 ...
source_ref rss
confidence 1.0
dedupe_key discovery_sector_rotation_delta:a7e4bf1ec8702515
episode_id NULL
created_at 2026-04-07T23:23:58.609841+00:00
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