Delete row sig_9d488c49cfc3 from signals

id sig_9d488c49cfc3
event_id evt_3cc332e941c2
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_00e8e2a43 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:dbc ...
throttle_s 0
created_at 2026-04-06T04:06:41.950642+00:00
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