Delete row sig_f477b86a7685 from signals

id sig_f477b86a7685
event_id evt_35269742ab29
watcher_id NULL
signal_type discovery_ipo_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_ingestor
reason_trace {"_evidence_event_ids":["evt_9b8ed80ca ...
dedupe_key signal_enriched:discovery_ipo_delta:05369e742a2537 ...
throttle_s 0
created_at 2026-04-08T19:57:42.365437+00:00
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