Delete row sig_2f30146afd36 from signals

id sig_2f30146afd36
event_id evt_d09adb70e4b8
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_84e5727f2 ...
dedupe_key signal_enriched:discovery_ipo_delta:a7c37e1b1ab706 ...
throttle_s 0
created_at 2026-04-20T09:07:46.072510+00:00
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