Delete row sig_acf9057cd8fd from signals

id sig_acf9057cd8fd
event_id evt_14f45f33587a
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_bdb66cdad ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:95b ...
throttle_s 0
created_at 2026-04-11T12:09:00.615097+00:00
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