Delete row sig_9d4fff85f885 from signals

id sig_9d4fff85f885
event_id evt_d6c0561eb585
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_63b75154f ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:7b6 ...
throttle_s 0
created_at 2026-04-17T21:52:12.771882+00:00
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