Delete row sig_11570894670b from signals

id sig_11570894670b
event_id evt_1a1ce2754349
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_ae3c96b36 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:0d5 ...
throttle_s 0
created_at 2026-04-18T00:01:35.734361+00:00
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