Delete row sig_2fd2afd967fa from signals

id sig_2fd2afd967fa
event_id evt_33ff658fa257
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_d00f017cc ...
dedupe_key signal_enriched:discovery_ipo_delta:2b6e9f30ec1636 ...
throttle_s 0
created_at 2026-04-20T13:10:00.946643+00:00
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