Delete row sig_7cba174c3b73 from signals

id sig_7cba174c3b73
event_id evt_d1d72637f548
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_cb7df55b0 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:ae9 ...
throttle_s 0
created_at 2026-04-09T13:37:34.641242+00:00
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