Delete row sig_ca53bf8a0410 from signals

id sig_ca53bf8a0410
event_id evt_00585478e919
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_0f69af1f1 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:090 ...
throttle_s 0
created_at 2026-04-12T19:16:15.659849+00:00
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