Delete row sig_81f794003c3a from signals

id sig_81f794003c3a
event_id evt_5585aa7c1897
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_e5c3fea24 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:d1d ...
throttle_s 0
created_at 2026-04-19T05:17:07.273148+00:00
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