Delete row sig_f3cb69f4e223 from signals

id sig_f3cb69f4e223
event_id evt_a62b4bde33e9
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_415bc6b2b ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:dfa ...
throttle_s 0
created_at 2026-04-14T17:20:03.235758+00:00
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