Delete row sig_db9a1b98d7af from signals

id sig_db9a1b98d7af
event_id evt_63341d044a72
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_264405766 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:487 ...
throttle_s 0
created_at 2026-04-16T06:11:20.111289+00:00
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