Delete row sig_05b5863430bc from signals

id sig_05b5863430bc
event_id evt_5546433c8eb3
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_527b71737 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:827 ...
throttle_s 0
created_at 2026-04-09T07:40:05.415195+00:00
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