Delete row sig_3b3c49341130 from signals

id sig_3b3c49341130
event_id evt_c19e42fcdb58
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_c4ecd8007 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:f60 ...
throttle_s 0
created_at 2026-04-19T12:46:14.065812+00:00
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