Delete row sig_8bc646411f52 from signals

id sig_8bc646411f52
event_id evt_018c9f064bd5
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_0f02e815c ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:f1d ...
throttle_s 0
created_at 2026-04-10T14:13:04.518445+00:00
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