Delete row 477267 from events

seq 477267
id evt_537653568694
kind signal_ingest
ts 2026-04-22T00:08:54.218068+00:00
actor daemon:signal_enrichment
subject_entity_ids []
payload {"created_at":"2026-04-22T00:01:09.681 ...
source_ref candidate:sc_65277cf9e6708157
confidence 0.42
dedupe_key signal_enriched:discovery_earnings_calendar_delta: ...
episode_id NULL
created_at 2026-04-22T00:08:54.218132+00:00
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