Delete row sig_27b225c4bfb6 from signals

id sig_27b225c4bfb6
event_id evt_29a299ade8ef
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_4d7fea95d ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:0d4 ...
throttle_s 0
created_at 2026-04-12T21:26:50.599768+00:00
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