Delete row sig_45e43f097d42 from signals

id sig_45e43f097d42
event_id evt_85992c6ff14b
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_bba9966a3 ...
dedupe_key signal_enriched:discovery_ipo_delta:df270d8f41a9c4 ...
throttle_s 0
created_at 2026-04-18T00:01:35.734361+00:00
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