Delete row sig_56b50c4c8b5d from signals

id sig_56b50c4c8b5d
event_id evt_b47dfaa542fc
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_679919939 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:e0b ...
throttle_s 0
created_at 2026-04-10T20:20:53.146920+00:00
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