Delete row sig_4637cc3adfd0 from signals

id sig_4637cc3adfd0
event_id evt_d8b4c93a8a6f
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_36599dd75 ...
dedupe_key signal_enriched:discovery_ipo_delta:26ece163c997d2 ...
throttle_s 0
created_at 2026-04-20T14:11:25.277652+00:00
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