Delete row sig_2b23d30afe77 from signals

id sig_2b23d30afe77
event_id evt_3c147370557b
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_03db5f18b ...
dedupe_key signal_enriched:discovery_ipo_delta:6973fd9e1e26b3 ...
throttle_s 0
created_at 2026-04-13T02:56:12.998484+00:00
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