Delete row sig_44fd7b7953a3 from signals

id sig_44fd7b7953a3
event_id evt_43a857b4eb2a
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_c3d5f123b ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:40c ...
throttle_s 0
created_at 2026-04-19T14:16:02.066097+00:00
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