Delete row sig_2222ab97148c from signals

id sig_2222ab97148c
event_id evt_03461466e172
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_8a526e5c7 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:f50 ...
throttle_s 0
created_at 2026-04-07T01:29:17.556338+00:00
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