Delete row sig_8970a366c26b from signals

id sig_8970a366c26b
event_id evt_3414aa8bd76c
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_ca69967f1 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:88c ...
throttle_s 0
created_at 2026-04-22T15:21:13.336230+00:00
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