Delete row sig_9459c693fd05 from signals

id sig_9459c693fd05
event_id evt_4f774aa0baa7
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_6e092e8ff ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:66f ...
throttle_s 0
created_at 2026-04-20T13:10:00.946643+00:00
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