Delete row sig_4a8fe1a3d33d from signals

id sig_4a8fe1a3d33d
event_id evt_6d45e5201830
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_17724a20f ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:696 ...
throttle_s 0
created_at 2026-04-12T01:38:58.509416+00:00
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