Delete row sig_5c77df5c8ce9 from signals

id sig_5c77df5c8ce9
event_id evt_82319323c747
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_3af097af7 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:915 ...
throttle_s 0
created_at 2026-04-19T00:47:45.189143+00:00
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