Delete row sig_81190e303d80 from signals

id sig_81190e303d80
event_id evt_e681d45d7bd8
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_fe8a18f58 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:60d ...
throttle_s 0
created_at 2026-04-10T13:12:08.706840+00:00
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