Delete row sig_39f1beced7c0 from signals

id sig_39f1beced7c0
event_id evt_5c4805152a77
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_f8dc4f0ff ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:143 ...
throttle_s 0
created_at 2026-04-09T22:59:43.472613+00:00
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