Delete row sig_aa1f4050a92c from signals

id sig_aa1f4050a92c
event_id evt_4f6e8df699d9
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_43f4c3217 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:571 ...
throttle_s 0
created_at 2026-04-19T21:44:00.177469+00:00
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