Delete row sig_fc12841d259e from signals

id sig_fc12841d259e
event_id evt_03232a7a04fb
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_274d2d4e1 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:116 ...
throttle_s 0
created_at 2026-04-19T15:45:47.773233+00:00
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