Delete row sig_789b8ead9389 from signals

id sig_789b8ead9389
event_id evt_5a2b8029d635
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_8deb82b95 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:a4e ...
throttle_s 0
created_at 2026-04-17T09:44:53.486531+00:00
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