Delete row sig_927fb7808b75 from signals

id sig_927fb7808b75
event_id evt_a252c339f514
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_e50c086c7 ...
dedupe_key signal_enriched:discovery_ipo_delta:cfe9aa77b64ff7 ...
throttle_s 0
created_at 2026-04-11T10:38:56.745219+00:00
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