Delete row sig_67929fe7b75d from signals

id sig_67929fe7b75d
event_id evt_57e6482596a6
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_7492c3a76 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:6d3 ...
throttle_s 0
created_at 2026-04-19T02:17:29.223764+00:00
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