Delete row sig_4e881fda2bbe from signals

id sig_4e881fda2bbe
event_id evt_e1920e084782
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_a1218c49c ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:42b ...
throttle_s 0
created_at 2026-04-11T01:41:34.996216+00:00
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