Delete row sig_1909e65b7dbb from signals

id sig_1909e65b7dbb
event_id evt_3536898cea27
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_b41530be0 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:54c ...
throttle_s 0
created_at 2026-04-22T14:13:37.135360+00:00
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