Delete row sig_4dfd3f8d1295 from signals

id sig_4dfd3f8d1295
event_id evt_a623adec3053
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_f1f6c53b3 ...
dedupe_key signal_enriched:discovery_ipo_delta:3751bf1f6bf075 ...
throttle_s 0
created_at 2026-04-08T19:57:42.365437+00:00
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