Delete row sig_c4b92e973ff3 from signals

id sig_c4b92e973ff3
event_id evt_b5ff765f7eac
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_352d4b2ac ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:e36 ...
throttle_s 0
created_at 2026-04-20T11:08:48.396890+00:00
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