Delete row sig_884925897ece from signals

id sig_884925897ece
event_id evt_a1326ca18649
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_6a96fa3bb ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:51b ...
throttle_s 0
created_at 2026-04-10T21:13:12.521723+00:00
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