Delete row sig_d40c98becb51 from signals

id sig_d40c98becb51
event_id evt_92ff91e94d7e
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_2b731dcd0 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:470 ...
throttle_s 0
created_at 2026-04-11T00:11:50.548611+00:00
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