Delete row sig_b619eff5847e from signals

id sig_b619eff5847e
event_id evt_0d2c3803f123
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_5fd41e9ae ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:08c ...
throttle_s 0
created_at 2026-04-19T18:44:42.562027+00:00
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