Delete row sig_b4d8dbb16428 from signals

id sig_b4d8dbb16428
event_id evt_1ea19a1911cf
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_21bc56f0a ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:9dc ...
throttle_s 0
created_at 2026-04-11T16:37:43.480344+00:00
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