Delete row sig_65164954400b from signals

id sig_65164954400b
event_id evt_c0081a8052ec
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_19fbd5953 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:27d ...
throttle_s 0
created_at 2026-04-06T22:34:24.548125+00:00
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