Delete row sig_a1e92c4c144f from signals

id sig_a1e92c4c144f
event_id evt_c4a9476eed9c
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_5dcc1094a ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:a5a ...
throttle_s 0
created_at 2026-04-20T11:08:48.396890+00:00
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