Delete row 478049 from events

seq 478049
id evt_78540752177a
kind signal_ingest
ts 2026-04-22T03:03:39.579914+00:00
actor collector:discovery
subject_entity_ids []
payload {"created_at":"2026-04-22T03:03:32.061 ...
source_ref crypto_mixed
confidence 1.0
dedupe_key discovery_crypto_extremes_snapshot:5b56ec9079f518b ...
episode_id NULL
created_at 2026-04-22T03:03:39.580145+00:00
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