Delete row sig_1ad1c39b9a90 from signals

id sig_1ad1c39b9a90
event_id evt_696266404812
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_d8fa982eb ...
dedupe_key signal_enriched:discovery_ipo_delta:b098211dabd1c2 ...
throttle_s 0
created_at 2026-04-08T04:29:57.674065+00:00
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