Delete row sig_f1422b731f7d from signals

id sig_f1422b731f7d
event_id evt_a2500a974f6b
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_69e9c0a22 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:0ac ...
throttle_s 0
created_at 2026-04-06T18:42:37.816572+00:00
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