Delete row sig_b9ffa3eb4253 from signals

id sig_b9ffa3eb4253
event_id evt_59e7c5bc5d5d
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_2ad394f43 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:d20 ...
throttle_s 0
created_at 2026-04-06T15:43:44.237581+00:00
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