Delete row sig_9226a5ed7999 from signals

id sig_9226a5ed7999
event_id evt_f6a7280c8a9d
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_938625a77 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:67b ...
throttle_s 0
created_at 2026-04-08T09:32:58.864102+00:00
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