Delete row sig_783da79e2f17 from signals

id sig_783da79e2f17
event_id evt_4609ab1ab64c
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_36e0d9235 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:819 ...
throttle_s 0
created_at 2026-04-08T08:32:19.428540+00:00
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