Delete row sig_254c5151805f from signals

id sig_254c5151805f
event_id evt_7d7a47a5db55
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_6b2f83072 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:577 ...
throttle_s 0
created_at 2026-04-11T09:08:15.689426+00:00
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