Delete row sig_19bc590a0e1b from signals

id sig_19bc590a0e1b
event_id evt_70f9f2f424af
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_ba7af896e ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:87d ...
throttle_s 0
created_at 2026-04-22T12:11:11.616908+00:00
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