Delete row sig_db4b7a9c802a from signals

id sig_db4b7a9c802a
event_id evt_4280635599a9
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_98cda8f04 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:c49 ...
throttle_s 0
created_at 2026-04-07T23:23:54.391414+00:00
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