Delete row sig_381c34ab1428 from signals

id sig_381c34ab1428
event_id evt_95261d591ddf
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_04d7bc5a3 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:7f4 ...
throttle_s 0
created_at 2026-04-08T21:48:34.772061+00:00
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