Delete row sig_fce8343988af from signals

id sig_fce8343988af
event_id evt_4710630b8421
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_a77c7aa00 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:ff7 ...
throttle_s 0
created_at 2026-04-13T11:55:13.805835+00:00
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