Delete row sig_bef37562c7ac from signals

id sig_bef37562c7ac
event_id evt_939f81d1212e
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_02f8ac609 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:44e ...
throttle_s 0
created_at 2026-04-12T17:46:47.322267+00:00
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