Delete row sig_3c2d67974858 from signals

id sig_3c2d67974858
event_id evt_914c59f0716e
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_893410447 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:a44 ...
throttle_s 0
created_at 2026-04-16T15:51:11.060198+00:00
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