Delete row sig_928adbe6b816 from signals

id sig_928adbe6b816
event_id evt_fd4d58723283
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_e5ec5380a ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:4a8 ...
throttle_s 0
created_at 2026-04-13T07:26:15.766370+00:00
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