Delete row sig_41ff9c4bb3b2 from signals

id sig_41ff9c4bb3b2
event_id evt_99cec420eff2
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_548a93c34 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:edc ...
throttle_s 0
created_at 2026-04-21T10:45:03.231354+00:00
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