Delete row sig_8d4eca3bf739 from signals

id sig_8d4eca3bf739
event_id evt_d633144d8023
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_22b91c4f0 ...
dedupe_key signal_enriched:discovery_unusual_volume_delta:46c ...
throttle_s 0
created_at 2026-04-19T17:15:33.112665+00:00
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