Delete row sig_cae391702879 from signals

id sig_cae391702879
event_id evt_f3c1f3846741
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_8ca5a5930 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:7b1 ...
throttle_s 0
created_at 2026-04-17T23:00:32.547123+00:00
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