Delete row sig_46eb77001919 from signals

id sig_46eb77001919
event_id evt_b44848f15728
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_ca82f7159 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:fc6 ...
throttle_s 0
created_at 2026-04-13T08:56:12.848092+00:00
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