Delete row sig_25b75dcfb2d0 from signals

id sig_25b75dcfb2d0
event_id evt_376e89d051f3
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_1077c73ae ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:142 ...
throttle_s 0
created_at 2026-04-11T03:10:51.104915+00:00
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