Delete row sig_de360dfc9b78 from signals

id sig_de360dfc9b78
event_id evt_913d0ae8ce0d
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_2092eefdb ...
dedupe_key signal_enriched:discovery_ipo_delta:866f332f2ce720 ...
throttle_s 0
created_at 2026-04-11T00:11:50.548611+00:00
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