Delete row sig_c431b9a8e26e from signals

id sig_c431b9a8e26e
event_id evt_584ea3c2c51d
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_33ffe5710 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:830 ...
throttle_s 0
created_at 2026-04-12T13:46:53.258496+00:00
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