Delete row 477703 from events

seq 477703
id evt_8454a49c5fa3
kind signal_ingest
ts 2026-04-22T01:09:12.198813+00:00
actor collector:opportunity_research
subject_entity_ids []
payload {"created_at":"2026-04-22T01:09:12.198 ...
source_ref web_search:serper
confidence 0.6
dedupe_key opportunity_research_snapshot:855d0aaca2fe6024
episode_id NULL
created_at 2026-04-22T01:09:13.811428+00:00
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