Delete row sig_0883bc5e4f7a from signals

id sig_0883bc5e4f7a
event_id evt_6b8e17803cba
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_d875ca80e ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:ac3 ...
throttle_s 0
created_at 2026-04-19T09:46:35.333003+00:00
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