Delete row sig_0c42f2cf11fd from signals

id sig_0c42f2cf11fd
event_id evt_0e08e32669c5
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_f29315a4a ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:a9a ...
throttle_s 0
created_at 2026-04-19T20:14:07.003061+00:00
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