Delete row sig_7cb351328896 from signals

id sig_7cb351328896
event_id evt_1c4718e00b5e
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_e760b8c03 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:472 ...
throttle_s 0
created_at 2026-04-09T04:42:09.468703+00:00
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