Delete row sig_3767838bffe1 from signals

id sig_3767838bffe1
event_id evt_65f048132ec6
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_75eceea0c ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:bd3 ...
throttle_s 0
created_at 2026-04-06T18:42:37.816572+00:00
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