Delete row sig_896d379d1055 from signals

id sig_896d379d1055
event_id evt_52694ec541b3
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_9abaaad6c ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:347 ...
throttle_s 0
created_at 2026-04-19T20:14:07.003061+00:00
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