Delete row sig_bfe9a9195967 from signals

id sig_bfe9a9195967
event_id evt_3ce8262aed54
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_4ac1cc71d ...
dedupe_key signal_enriched:discovery_ipo_delta:07d366e2f3d0d1 ...
throttle_s 0
created_at 2026-04-20T09:07:46.072510+00:00
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