Delete row sig_fdb85c69392c from signals

id sig_fdb85c69392c
event_id evt_9d2b59b2bfa7
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_f2066fb1e ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:59f ...
throttle_s 0
created_at 2026-04-17T21:52:12.771882+00:00
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