Delete row sig_39bcbdefa89c from signals

id sig_39bcbdefa89c
event_id evt_9fe6c8a2b941
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_29fb8c15b ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:88c ...
throttle_s 0
created_at 2026-04-18T17:18:47.705432+00:00
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