Delete row sig_596b98c107f5 from signals

id sig_596b98c107f5
event_id evt_8bc7cded0154
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_05abad5e4 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:0c9 ...
throttle_s 0
created_at 2026-04-08T07:31:44.637479+00:00
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