Delete row sig_fe482820762b from signals

id sig_fe482820762b
event_id evt_3678a08f0b27
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_ef98f692a ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:26c ...
throttle_s 0
created_at 2026-04-18T03:05:05.644967+00:00
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