Delete row sig_2d52d579708d from signals

id sig_2d52d579708d
event_id evt_062b2eafe0a2
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_5a2118f12 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:5b3 ...
throttle_s 0
created_at 2026-04-20T12:09:20.977224+00:00
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