Delete row sig_031700ba0a28 from signals

id sig_031700ba0a28
event_id evt_fbae1916394c
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_5c1643ad3 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:c78 ...
throttle_s 0
created_at 2026-04-10T13:12:08.706840+00:00
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