Delete row sig_f11417654557 from signals

id sig_f11417654557
event_id evt_4b8dcaeaf9f5
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_13c34061f ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:5ba ...
throttle_s 0
created_at 2026-04-11T00:11:50.548611+00:00
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