Delete row sig_dcb9b991fe31 from signals

id sig_dcb9b991fe31
event_id evt_1cf3a7828be2
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_d64a01f4f ...
dedupe_key signal_enriched:discovery_ipo_delta:f5d6f1f86354d7 ...
throttle_s 0
created_at 2026-04-07T23:23:54.391414+00:00
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