Delete row sig_b85629e54254 from signals

id sig_b85629e54254
event_id evt_fe25bf2b9582
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_d3ae64a6c ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:272 ...
throttle_s 0
created_at 2026-04-10T01:02:52.094973+00:00
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