Delete row sig_bd9ffa458266 from signals

id sig_bd9ffa458266
event_id evt_17c5a9b8662f
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_955129bd9 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:b11 ...
throttle_s 0
created_at 2026-04-19T06:46:55.414367+00:00
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