Delete row sig_98643caf8f71 from signals

id sig_98643caf8f71
event_id evt_18786d22a89e
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_9cdf87a35 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:a79 ...
throttle_s 0
created_at 2026-04-16T20:41:43.224690+00:00
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