Delete row sig_cb667345a7f4 from signals

id sig_cb667345a7f4
event_id evt_040faed44dea
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_8d7680ba6 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:0bd ...
throttle_s 0
created_at 2026-04-09T04:42:09.468703+00:00
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