Delete row 306348 from events

seq 306348
id evt_623942210741
kind signal_candidate_ingest
ts 2026-04-19T12:46:14.065812+00:00
actor collector:discovery
subject_entity_ids []
payload {"created_at":"2026-04-19T12:46:14.065 ...
source_ref rss
confidence 1.0
dedupe_key discovery_sector_rotation_delta:d7d31882e95056e5
episode_id NULL
created_at 2026-04-19T12:46:19.071605+00:00
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