Delete row sig_13fd9532b331 from signals

id sig_13fd9532b331
event_id evt_f03f007fb243
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_74e8e7c27 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:88b ...
throttle_s 0
created_at 2026-04-18T15:49:14.474663+00:00
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