Delete row sig_4b681d66e1da from signals

id sig_4b681d66e1da
event_id evt_95f1ea70a927
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_e6885c799 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:0a2 ...
throttle_s 0
created_at 2026-04-10T12:11:33.277556+00:00
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