Delete row sig_c5d53b36de44 from signals

id sig_c5d53b36de44
event_id evt_547f5163c28d
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_87ff04b4f ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:5c4 ...
throttle_s 0
created_at 2026-04-17T21:52:12.771882+00:00
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