Delete row sig_0ffbb94fbef3 from signals

id sig_0ffbb94fbef3
event_id evt_5e528e55e33b
watcher_id NULL
signal_type discovery_unusual_volume_delta
value {"aggregator_url":"https://www.nasdaq. ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_ingestor
reason_trace {"_evidence_event_ids":["evt_03767f705 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:574 ...
throttle_s 0
created_at 2026-04-08T05:30:32.359517+00:00
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