Delete row 470278 from events

seq 470278
id evt_08d971995d31
kind signal_ingest
ts 2026-04-21T09:16:17.430420+00:00
actor collector:discovery
subject_entity_ids []
payload {"created_at":"2026-04-21T09:16:05.409 ...
source_ref sec:edgar
confidence 1.0
dedupe_key discovery_sec_filings_snapshot:f12cbc650d45808d
episode_id NULL
created_at 2026-04-21T09:16:17.431131+00:00
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