Delete row sig_d14f5984792f from signals

id sig_d14f5984792f
event_id evt_8dc31d98f84f
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_8e59aae04 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:484 ...
throttle_s 0
created_at 2026-04-10T15:51:15.884890+00:00
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