Delete row sig_12cb7815559e from signals

id sig_12cb7815559e
event_id evt_75b43053a00b
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_357e322e9 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:def ...
throttle_s 0
created_at 2026-04-08T02:28:02.401723+00:00
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