Delete row sig_78b59725dc8e from signals

id sig_78b59725dc8e
event_id evt_77edda0343aa
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_01983ee0c ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:352 ...
throttle_s 0
created_at 2026-04-13T18:15:55.373957+00:00
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