Delete row sig_4f58dd8a680d from signals

id sig_4f58dd8a680d
event_id evt_6fcff603a717
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_e84af1ecf ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:720 ...
throttle_s 0
created_at 2026-04-20T12:09:20.977224+00:00
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