Delete row sig_b7c38cdd03f1 from signals

id sig_b7c38cdd03f1
event_id evt_058ce8f43b76
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_daf34180a ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:660 ...
throttle_s 0
created_at 2026-04-20T14:11:25.277652+00:00
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