Delete row 477203 from events

seq 477203
id evt_81cf51768eca
kind signal_ingest
ts 2026-04-22T00:07:23.266561+00:00
actor daemon:signal_enrichment
subject_entity_ids []
payload {"created_at":"2026-04-22T00:01:09.681 ...
source_ref candidate:sc_43d945226929b160
confidence 0.42
dedupe_key signal_enriched:discovery_earnings_calendar_delta: ...
episode_id NULL
created_at 2026-04-22T00:07:23.266635+00:00
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